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Section 22. 12-bit High-Speed Successive Approximation

This section of the manual contains the following major topics:

22.1 Introduction .................................................................................................................. 22-2

22.2 Control Registers ......................................................................................................... 22-6

22.3 ADC Operation........................................................................................................... 22-61

22.4 ADC Module Configuration ........................................................................................ 22-65

22.5 Additional ADC Functions .......................................................................................... 22-85

22.6 Interrupts.................................................................................................................. 22-108

22.7 Operation During Power-Saving Modes .................................................................. 22-114

22.8 Effects of Reset........................................................................................................ 22-116

22.9 Transfer Function..................................................................................................... 22-116

22.10 ADC Sampling Requirements.................................................................................. 22-117

22.11 Connection Considerations...................................................................................... 22-117

22.12 Related Application Notes........................................................................................ 22-118

22.13 Revision History ....................................................................................................... 22-119

PIC32 Family Reference Manual

22.1 INTRODUCTION

The PIC32 12-bit High-Speed Successive Approximation Register (SAR) Analog-to-Digital

Converter (ADC) includes the following features:

• 12-bit resolution

• Up to eight ADC modules with dedicated Sample and Hold (S&H) circuits (see Note 1)

• Two dedicated ADC modules can be combined in Turbo mode to provide double

conversion rate

• Single-ended and/or differential inputs

• Can operate during Sleep mode

• Supports touch sense applications

• Up to six digital comparators

• Up to six digital filters supporting two modes:

- Oversampling mode

- Averaging mode

• FIFO and DMA engine for dedicated ADC modules (see Note 2)

• Early interrupt generation resulting in faster processing of converted data

• Designed for motor control, power conversion, and general purpose applications

The dedicated ADC modules use a single input (or its alternate) and is intended for high-speed

and precise sampling of time-sensitive or transient inputs, whereas the shared ADC module

incorporates a multiplexer on the input to facilitate a larger group of inputs, with slower sampling,

and provides flexible automated scanning option through the input scan logic.

For each ADC module, the analog inputs are connected to the S&H capacitor. The clock,

sampling time, and output data resolution for each ADC module can be set independently. The

ADC module performs the conversion of the input analog signal based on the configurations set

in the registers. When conversion is complete, the final result is stored in the result buffer for the

specific analog input and is passed to the digital filter and digital comparator if configured to use

data from this particular sample.

A simplified block diagram of the ADC module is illustrated in Figure 22-1.

Note: This family reference manual section is meant to serve as a complement to device

data sheets. Depending on the device, this manual section may not apply to all

PIC32 devices.

Please refer to the note at the beginning of the “ADC” chapter in the current device

data sheet to check whether this document supports the device you are using.

Device data sheets and family reference manual sections are available for

download from the Microchip Worldwide Web site at: http://www.microchip.com

Note 1: Depending on the device, the 12-bit High-Speed SAR ADC has up to seven

dedicated ADC modules and one shared ADC module. Throughout this chapter,

the diagrams and code examples refer to a device with seven dedicated ADC

modules (ADC0-ADC6) and one shared ADC (ADC7). Please consult the “ADC”

chapter in the specific device data sheet to determine which ADC modules are

available for your device.

2: This feature is not available on all devices. Refer to the “ADC” chapter in the

specific device data sheet to determine availability.

3: Prior to enabling the ADC module, the user application must copy the ADC

calibration data (DEVADCx) from the Configuration memory into the ADC

Configuration registers (ADC0CFG-ADC7CFG). Refer to the “ADC” chapter in the

specific device data sheet for more information.

Section 22. 12-bit High-Speed SAR ADC

Figure 22-1: ADC Block Diagram

Note: The number of ADC modules, analog inputs, ANa, ANb, ANc, and ANd, and the FIFO and DMA features

are shown as an example. Refer to the “ADC” chapter in the specific device data sheet to determine the

actual ANx selections, ADC module availability, and the specific FIFO and DMA features.

ADC0

ADC7

REF

+ V

REF

VREFSEL<2:0>

REFH

REFL

ADCSEL<1:0>

CONCLKDIV<5:0>

FRC PBCLK

ADCDIV<6:0>

(ADCxTIME<22:16>)

ADCDIV<6:0>

(ADCCON2<6:0>)

AD0

-T

AD6

AD7

ADDATA0

…...

ADDATA63

(Dedicated

ADC)

(Dedicated

ADC)

FIFO

DMA

Digital Filter

Digital Comparator Interrupt/Event

Capacitive Voltage

Divider (CVD) Interrupt/Event

Triggers,

Turbo Channel,

Scan Control Logic

Trigger

Status and Control

Registers

ADC6

SH0ALT<1:0>

(ADCTRGMODE<17:16>)

ANx

REFL

DIFFx<1>

(ADCIMCONx<x>)

ANa

AN1

REFL

DIFF1<1>

(ADCIMCON1<3>)

SH6ALT<1:0>

(ADCTRGMODE<29:28>)

ANx

REFL

DIFFx<1>

(ADCIMCONx<x>)

AN49

CTMU

BAT

AN48

AN7

CVD

Capacitor

CLK

ANb

ANc

ANd

ANb

ANc

ANd

SYSTEMBUS

ANa

Interrupt

Data

PIC32 Family Reference Manual

Figure 22-2: FIFO Block Diagram

FEN

(ADCFSTAT<31>

FIFO

(Depth Device Dependent)

ADCFIFO DATA<31:0>

ADCID<2:0>

ADCFSTAT<2:0> ADCx ID

ADCx ID Converted Data

ADC6

ADC6EN

(ADCFSTAT<30>)

ADC5

ADC5EN

(ADCFSTAT<29>)

ADC0

ADC0EN

(ADCFSTAT<24>)

If data

available in

FIFO

FRDY

ADCFSTAT<22>

FIEN

(ADCFSTAT<23>

Interrupt

FCNT<7:0>

ADCFSTAT<15:8>

(Number of data in FIFO)

Note: The number of ADC modules, analog inputs, ANa, ANb, ANc, and ANd, and the FIFO and DMA features

are shown as an example. Refer to the “ADC” chapter in the specific device data sheet to determine the

actual ANx selections, ADC module availability, and the specific FIFO and DMA features.

Section 22. 12-bit High-Speed SAR ADC

Figure 22-3: DMA Block Diagram

DMAGEN

(ADCDMASTAT<31>)

ADC6

DMAEN

(ADC6TIME<23>)

ADC5

ADC0

DMAEN

(ADC5TIME<23>)

DMAEN

(ADC0TIME<23>)

Buffer A (ADC0)

Buffer B (ADC0)

Buffer A (ADC1)

Buffer B (ADC1)

Buffer A (ADC6)

Buffer B (ADC6)

DMABL<2:0>

Buffer

Full?

RAF0

(ADCDMASTAT<0>)

RAFIEN0

(ADCDMASTAT<8>)

Interrupt

Buffer

Full?

RBF6

(ADCDMASTAT<22>)

RBFIEN6

(ADCDMASTAT<30>)

Interrupt

Data Count for Buffer-A

(ADC0)

Data Count for Buffer-B

(ADC0)

Data Count for Buffer-A

(ADC1)

Data Count for Buffer-B

(ADC1)

Data Count for Buffer-A

(ADC6)

Data Count for Buffer-B

(ADC6)

DMABADDR<31:0>

CNTBADDR<31:0>

CNTBADDR<31:0> + 1

CNTBADDR<31:0> + 2

CNTBADDR<31:0> + 3

Note: The number of ADC modules, analog inputs, ANa, ANb, ANc, and ANd, and the FIFO and DMA features

are shown as an example. Refer to the “ADC” chapter in the specific device data sheet to determine the

actual ANx selections, ADC module availability, and the specific FIFO and DMA features.

PIC32 Family Reference Manual

22.2 CONTROL REGISTERS

The PIC32 12-bit High-Speed SAR ADC module has the following Special Function Registers

(SFRs):

•ADCCON1: ADC Control Register 1

This register controls the basic operation of all ADC modules, including behavior in Sleep

and Idle modes, and data formatting. This register also specifies the vector shift amounts for

the Interrupt Controller. Additional ADCCON1 functions include controlling the Turbo feature

of the ADC, the RAM buffer length in DMA mode, and Capacitive Voltage Division (CVD).

•ADCCON2: ADC Control Register 2

This register controls the reference selection for all ADC modules, the sample time for the

shared ADC module, interrupt enable for reference, early interrupt selection, and clock

division selection for the shared ADC.

•ADCCON3: ADC Control Register 3

This register enables ADC clock selection, enables/disables the digital feature for the

dedicated and shared ADC modules and controls the manual (software) sampling and

conversion.

•ADCTRGMODE: ADC Triggering Mode for Dedicated ADC Register

This register has selections for alternate analog inputs and includes trigger settings for the

dedicated ADC modules.

•ADCIMCON1: ADC Input Mode Control Register 1 through

ADCIMCON4: ADC Input Mode Control Register 4

These registers enable the user to select between single-ended and differential operation

as well as select between signed and unsigned data format.

•ADCGIRQEN1: ADC Global Interrupt Enable Register 1 and

ADCGIRQEN2: ADC Global Interrupt Enable Register 2

These registers specify which of the individual input conversion interrupts can generate the

global ADC interrupt.

•ADCCSS1: ADC Common Scan Select Register 1 and

ADCCSS2: ADC Common Scan Select Register 2

These registers specify the analog inputs to be scanned by the common scan trigger.

•ADCDSTAT1: ADC Data Ready Status Register 1 and

ADCDSTAT2: ADC Data Ready Status Register 2

These registers contain the interrupt status of the individual analog input conversions. Each

bit represents the data-ready status for its associated conversion result.

•ADCCMPENx: ADC Digital Comparator ‘x’ Enable Register (‘x’ = 1 through 6)

These registers select which analog input conversion results will be processed by the digital

comparator.

•ADCCMPx: ADC Digital Comparator ‘x’ Limit Value Register (‘x’ = 1 through 6)

These registers contain the high and low digital comparison values for use by the digital

comparator.

•ADCFLTRx: ADC Digital Filter ‘x’ Register (‘x’ = 1 through 6)

These registers provide control and status bits for the oversampling filter accumulator, and

also includes the 16-bit filter output data.

•ADCTRG1: ADC Trigger Source 1Register

This register controls the trigger source selection for AN0 through AN3 analog inputs.

•ADCTRG2: ADC Trigger Source 2 Register

This register controls the trigger source selection for AN4 through AN7 analog inputs.

•ADCTRG3: ADC Trigger Source 3 Register

This register controls the trigger source selection for AN8 through AN11 analog inputs.

•ADCTRG4: ADC Trigger Source 4 Register

This register controls the trigger source selection for AN12 through AN15 analog inputs.

•ADCTRG5: ADC Trigger Source 5 Register

This register controls the trigger source selection for AN16 through AN19 analog inputs.

Section 22. 12-bit High-Speed SAR ADC

•ADCTRG6: ADC Trigger Source 6 Register

This register controls the trigger source selection for AN20 through AN23 analog inputs.

•ADCTRG7: ADC Trigger Source 7 Register

This register controls the trigger source selection for AN24 through AN27 analog inputs.

•ADCTRG8: ADC Trigger Source 8 Register

This register controls the trigger source selection for AN28 through AN31 analog inputs.

•ADCCMPCON1: ADC Digital Comparator 1 Control Register

This register controls the operation of Digital Comparator 1, including the generation of inter-

rupts, comparison criteria to be used, and provides status when a comparator event occurs.

Additionally, this register provides the output data of CVD.

•ADCCMPCONx: ADC Digital Comparator ‘x’ Control Register (‘x’ = 2 through 6)

These registers control the operation of Digital Comparators 2 through 6, including the

generation of interrupts and the comparison criteria to be used. This register also provides

status when a comparator event occurs.

•ADCFSTAT: ADC FIFO Status Register

This register specifies the status of the dedicated ADC module FIFO.

•ADCFIFO: ADC FIFO Data Register

This register specifies the output value of the dedicated ADC module FIFO.

•ADCBASE: ADC Base Register

These registers specify the base address of the user ADC Interrupt Service Routine (ISR)

jump table.

•ADCDMASTAT: ADC DMA Status Register

This register contains the DMA status bits.

•ADCCNTB: ADC Sample Count Base Address Register

This register contains the base address of the sample count in RAM. In addition to storying

the converted data of each dedicated ADC module in RAM, DMA also stores the converted

sample count.

•ADCDMAB: ADC DMA Base Address Register

This register contains the base address of RAM for the DMA engine.

•ADCTRGSNS: ADC Trigger Level/Edge Sensitivity Register

This register contains the setting for trigger level for each ADC analog input.

•ADCxTIME: Dedicated ADCx Timing Register ‘x’ (‘x’ = 0 through 6)

These registers contains the time and clock setting for dedicated analog input.

•ADCEIEN1: ADC Early Interrupt Enable Register 1 and

ADCEIEN2: ADC Early Interrupt Enable Register 2

These registers contains bits to enable or disable early interrupt for individual analog inputs.

•ADCEISTAT1: ADC Early Interrupt Status Register 1 and

ADCEISTAT2: ADC Early Interrupt Status Register 2

These registers contain status bits for early interrupt for individual analog inputs.

•ADCANCON: ADC Analog Warm-up Control Register

This register contains the warm-up control settings for the analog and bias circuit of the ADC

module.

•ADCDATAx: ADC Output Data Register (‘x’ = 0 through 63)

These registers are the analog-to-digital conversion output data registers. The ADCDATAx

•ADCxCFG: ADCx Configuration Register ‘x’ (‘x’ = 0 through 7)

These registers specify the ADC module configuration data.

•ADCSYSCFG0: ADC System Configuration Register 0 and

ADCSYSCFG1: ADC System Configuration Register 1

These registers contain read-only bits corresponding to the analog input.

Table 22-1 provides a summary of all ADC Special Function Registers (SFRs). Corresponding registers

include a detailed description of each bit. Depending on the device, functionality will vary. Refer to the “A

data sheet to determine which registers are available for your device.

Table 22-1: ADC SFR Summary

Range Bit 31/15 Bit 30/14 Bit 29/13 Bit 28/12 Bit 27/11 Bit 26/10 Bit 25/9 Bit 24/8 Bit 23/7 Bit 22/6 Bit 21/5 Bit 20/4 B

ADCCON1

31:16 TRBEN TRBERR TRBMST<2:0> TRBSLV<2:0> FRACT SELRES<1:0>

15:0 ON — SIDL AICPMPEN CVDEN FSSCLKEN FSPBCLKEN — — IRQVS<2:0> ST

ADCCON2

31:16 BGVRRDY REFFLT EOSRDY CVDCPL<2:0> SAMC<9:0>

15:0 BGVRIEN REFFLTIEN EOSIEN ADCEIOVR ECRIEN ADCEIS<2:0> — ADC

ADCCON3

31:16 ADCSEL<1:0> CONCLKDIV<5:0> DIGEN7 DIGEN6 DIGEN5 DIGEN4 D

15:0 VREFSEL<2:0> TRGSUSP UPDIEN UPDRDY SAMP RQCNVRT GLSWTRG GSWTRG

ADCTRGMODE

31:16 — — SH6ALT<1:0> SH5ALT<1:0> SH4ALT<1:0> SH3ALT<1:0> SH2ALT<1:0>

15:0 — STRGEN6 STRGEN5 STRGEN4 STRGEN3 STRGEN2 STRGEN1 STRGEN0 — SSAMPEN6 SSAMPEN5 SSAMPEN4 SS

ADCIMCON1

31:16 DIFF15 SIGN15 DIFF14 SIGN14 DIFF13 SIGN13 DIFF12 SIGN12 DIFF11 SIGN11 DIFF10 SIGN10

15:0 DIFF7 SIGN7 DIFF6 SIGN6 DIFF5 SIGN5 DIFF4 SIGN4 DIFF3 SIGN3 DIFF2 SIGN2 D

ADCIMCON2

31:16 DIFF31 SIGN31 DIFF30 SIGN30 DIFF29 SIGN29 DIFF28 SIGN28 DIFF27 SIGN27 DIFF26 SIGN26 D

15:0 DIFF23 SIGN23 DIFF22 SIGN22 DIFF21 SIGN21 DIFF20 SIGN20 DIFF19 SIGN19 DIFF18 SIGN18 D

ADCIMCON3

31:16 DIFF47 SIGN47 DIFF46 SIGN46 DIFF45 SIGN45 DIFF44 SIGN44 DIFF43 SIGN43 DIFF42 SIGN42 D

15:0 DIFF39 SIGN39 DIFF38 SIGN38 DIFF37 SIGN37 DIFF36 SIGN36 DIFF35 SIGN35 DIFF34 SIGN34 D

ADCIMCON4

31:16 DIFF63 SIGN63 DIFF62 SIGN62 DIFF61 SIGN61 DIFF60 SIGN60 DIFF59 SIGN59 DIFF58 SIGN58 D

15:0 DIFF55 SIGN55 DIFF54 SIGN54 DIFF53 SIGN53 DIFF52 SIGN52 DIFF51 SIGN51 DIFF50 SIGN50 D

ADCGIRQEN1

31:16 AGIEN31 AGIEN30 AGIEN29 AGIEN28 AGIEN27 AGIEN26 AGIEN25 AGIEN24 AGIEN23 AGIEN22 AGIEN21 AGIEN20 A

15:0 AGIEN15 AGIEN14 AGIEN13 AGIEN12 AGIEN11 AGIEN10 AGIEN9 AGIEN8 AGIEN7 AGIEN6 AGIEN5 AGIEN4 A

ADCGIRQEN2

31:16 AGIEN63 AGIEN62 AGIEN61 AGIEN60 AGIEN59 AGIEN58 AGIEN57 AGIEN56 AGIEN55 AGIEN54 AGIEN53 AGIEN52 A

15:0 AGIEN47 AGIEN46 AGIEN45 AGIEN44 AGIEN43 AGIEN42 AGIEN41 AGIEN40 AGIEN39 AGIEN38 AGIEN37 AGIEN36 A

ADCCSS1

31:16 CSS31 CSS30 CSS29 CSS28 CSS27 CSS26 CSS25 CSS24 CSS23 CSS22 CSS21 CSS20 C

15:0 CSS15 CSS14 CSS13 CSS12 CSS11 CSS10 CSS9 CSS8 CSS7 CSS6 CSS5 CSS4

ADCCSS2

31:16 CSS63 CSS62 CSS61 CSS60 CSS59 CSS58 CSS57 CSS56 CSS55 CSS54 CSS53 CSS52 C

15:0 CSS47 CSS46 CSS45 CSS44 CSS43 CSS42 CSS41 CSS40 CSS39 CSS38 CSS37 CSS36 C

ADCDSTAT1

31:16 ARDY31 ARDY30 ARDY29 ARDY28 ARDY27 ARDY26 ARDY25 ARDY24 ARDY23 ARDY22 ARDY21 ARDY20 A

15:0 ARDY15 ARDY14 ARDY13 ARDY12 ARDY11 ARDY10 ARDY9 ARDY8 ARDY7 ARDY6 ARDY5 ARDY4 A

ADCDSTAT2

31:16 ARDY63 ARDY62 ARDY61 ARDY60 ARDY59 ARDY58 ARDY57 ARDY56 ARDY55 ARDY54 ARDY53 ARDY52 A

15:0 ARDY47 ARDY46 ARDY45 ARDY44 ARDY43 ARDY42 ARDY41 ARDY40 ARDY39 ARDY38 ARDY37 ARDY36 A

ADCCMPENx

‘x’ = 1-6

31:16 CMPE31 CMPE30 CMPE29 CMPE28 CMPE27 CMPE26 CMPE25 CMPE24 CMPE23 CMPE22 CMPE21 CMPE20 C

15:0 CMPE15 CMPE14 CMPE13 CMPE12 CMPE11 CMPE10 CMPE9 CMPE8 CMPE7 CMPE6 CMPE5 CMPE4 C

ADCCMPx

‘x’ = 1-6

31:16 DCMPHI<15:0>

15:0 DCMPLO<15:0>

ADCFLTRx

‘x’ = 1-6

31:16 AFEN DATA16EN DFMODE OVRSAM<2:0> AFGIEN AFRDY — — —

15:0 FLTRDATA<15:0>

ADCTRG1

31:16 — — — —— TRGSRC3<4:0> —

15:0 — — — —— TRGSRC1<4:0> —

ADCTRG2

31:16 — — — —— TRGSRC7<4:0> —

15:0 — — — —— TRGSRC5<4:0> —

ADCTRG3

31:16 — — — TRGSRC11<4:0> —— —

15:0 — — — —— TRGSRC9<4:0> —

ADCTRG4

31:16 — — — TRGSRC15<4:0> —— —

15:0 — — — —— TRGSRC13<4:0> —

ADCTRG5

31:16 — — — TRGSRC19<4:0> —— —

15:0 — — — —— TRGSRC17<4:0> —

Note 1: Before enabling the ADC, the user application must initialize the ADC calibration values by copying them from the factory-programmed DEVADCx Flash register

registers.

ADCTRG6

31:16 — — — TRGSRC23<4:0> —— —

15:0 — — — TRGSRC21<4:0> —— —

ADCTRG7

31:16 — — — TRGSRC27<4:0> —— —

15:0 — — — TRGSRC25<4:0> —— —

ADCTRG8

31:16 — — — TRGSRC31<4:0> —— —

15:0 — — — TRGSRC29<4:0> —— —

ADCCMPCON1

31:16 CVDDATA<15:0>

15:0 — — AINID<5:0> ENDCMP DCMPGIEN DCMPED IEBTWN I

ADCCMPCONx

‘x’ = 2-6

31:16 — — — — — — — — — — — —

15:0 — — — AINID<4:0> ENDCMP DCMPGIEN DCMPED IEBTWN I

ADCFSTAT

31:16 FEN ADC6EN ADC5EN ADC4EN ADC3EN ADC2EN ADC1EN ADC0EN FIEN FRDY FWROVERR —

15:0 FCNT<7:0> FSIGN — — —

ADCFIFO

31:16 DATA<31:16>

15:0 DATA<15:0>

ADCBASE

31:16 — — — — — — — — — — — —

15:0 ADCBASE<15:0>

ADCDMASTAT

31:16 DMAGEN RBFIEN6 RBFIEN5 RBFIEN4 RBFIEN3 RBFIEN2 RBFIEN1 RBFIEN0 DMAWROVERR RBF6 RBF5 RBF4

15:0 DMACNTEN RAFIEN6 RAFIEN5 RAFIEN4 RAFIEN3 RAFIEN2 RAFIEN1 RAFIEN0 — RAF6 RAF5 RAF4

ADCCNTB

31:16 CNTBADDR<31:16>

15:0 CNTBADDR<15:0>

ADCDMAB

31:16 DMABADDR<31:16>

15:0 DMABADDR<15:0>

ADCTRGSNS

31:16 LVL31 LVL30 LVL29 LVL28 LVL27 LVL26 LVL25 LVL24 LVL23 LVL22 LVL21 LVL20

15:0 LVL15 LVL14 LVL13 LVL12 LVL11 LVL10 LVL9 LVL8 LVL7 LVL6 LVL5 LVL4

ADCxTIME

‘x’ = 0-6

31:16 — — — ADCEIS<2:0> SELRES<1:0> DMAEN ADC

15:0 — — — — — — SAMC<9:0>

ADCEIEN1

31:16 EIEN31 EIEN30 EIEN29 EIEN28 EIEN27 EIEN26 EIEN25 EIEN24 EIEN23 EIEN22 EIEN21 EIEN20 E

15:0 EIEN15 EIEN14 EIEN13 EIEN12 EIEN11 EIEN10 EIEN9 EIEN8 EIEN7 EIEN6 EIEN5 EIEN4

ADCEIEN2

31:16 EIEN63 EIEN62 EIEN61 EIEN60 EIEN59 EIEN58 EIEN57 EIEN56 EIEN55 EIEN54 EIEN53 EIEN52 E

15:0 EIEN47 EIEN46 EIEN45 EIEN44 EIEN43 EIEN42 EIEN41 EIEN40 EIEN39 EIEN38 EIEN37 EIEN36 E

ADCEISTAT1

31:16 EIRDY31 EIRDY30 EIRDY29 EIRDY28 EIRDY27 EIRDY26 EIRDY25 EIRDY24 EIRDY23 EIRDY22 EIRDY21 EIRDY20 E

15:0 EIRDY15 EIRDY14 EIRDY13 EIRDY12 EIRDY11 EIRDY10 EIRDY9 EIRDY8 EIRDY7 EIRDY6 EIRDY5 EIRDY4 E

ADCEISTAT2

31:16 EIRDY63 EIRDY62 EIRDY61 EIRDY60 EIRDY59 EIRDY58 EIRDY57 EIRDY56 EIRDY55 EIRDY54 EIRDY53 EIRDY52 E

15:0 EIRDY47 EIRDY46 EIRDY45 EIRDY44 EI DY39 EIRDY38 EIRDY37 EIRDY36 ERDY43 EIRDY42 EIRDY41 EIRDY40 EIR

ADCANCON

31:16 — — — — WKUPCLKCNT<3:0> WKIEN7 WKIEN6 WKIEN5 WKIEN4 W

15:0 WKRDY7 WKRDY6 WKRDY5 WKRDY4 WKRDY3 WKRDY2 WKRDY1 WKRDY0 ANEN7 ANEN6 ANEN5 ANEN4 A

ADCDATAx

('x' = 0 to 63)

31:16 DATA<31:16>

15:0 DATA<15:0>

ADCxCFG

‘x’ = 0-7

(1)

31:16 ADCCFG<31:16>

15:0 ADCCFG<15:0>

ADCSYSCFG0

31:16 AN<31:16>

15:0 AN<15:0>

ADCSYSCFG1

31:16 AN<63:48>

15:0 AN<47:32>

Table 22-1: ADC SFR Summary

Range Bit 31/15 Bit 30/14 Bit 29/13 Bit 28/12 Bit 27/11 Bit 26/10 Bit 25/9 Bit 24/8 Bit 23/7 Bit 22/6 Bit 21/5 Bit 20/4 B

Note 1: Before enabling the ADC, the user application must initialize the ADC calibration values by copying them from the factory-programmed DEVADCx Flash register

registers.

PIC32 Family Reference Manual

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R-0, HS, HC R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

TRBEN TRBERR TRBMST<2:0> TRBSLV<2:0>

23:16

R/W-0 R/W-1 R/W-1 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

FRACT SELRES<1:0> STRGSRC<4:0>

15:8

R/W-0 U-0 R/W-0 R/W-1 R/W-0 R/W-0 R/W-0 U-0

ON — SIDL AICPMPEN CVDEN FSSCLKEN FSPBCLKEN —

7:0

U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— IRQVS<2:0> STRGLVL DMABL<2:0>

Legend: HC = Hardware Set HS = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 TRBEN: Turbo Channel Enable bit

1 = Enable the Turbo channel

0 = Disable the Turbo channel

bit 30 TRBERR: Turbo Channel Error Status bit

1 = An error occurred while setting the Turbo channel and Turbo channel function to be disabled regardless

of the TRBEN bit being set to ‘1’.

0 = Turbo channel error did not occur

Note: The status of this bit is valid only after the TRBEN bit is set.

bit 29-27 TRBMST<2:0>: Turbo Master ADCx bits

111 = Reserved

110 = ADC6 is selected as the Turbo Master

•

000 = ADC0 is selected as the Turbo Master

bit 26-24 TRBSLV<2:0>: Turbo Slave ADCx bits

111 = Reserved

110 = ADC6 is selected as the Turbo Slave

•

000 = ADC0 is selected as the Turbo Slave

bit 23 FRACT: Fractional Data Output Format bit

1 = Fractional

0 = Integer

bit 22-21 SELRES<1:0>: Shared ADC Resolution bits

11 = 12 bits (default)

10 = 10 bits

01 = 8 bits

00 = 6 bits

bit 20-16 STRGSRC<4:0>: Scan Trigger Source Select bits

11111 00100 - = Refer to the “ADC” chapter in the specific device data sheet for trigger source selections

00011 = Reserved

00010 = Global level software trigger (GLSWTRG) is not self-cleared

00001 = Global software trigger (GSWTRG) is self-cleared on the next clock cycle

00000 = No trigger

bit 15 ON: ADC Module Enable bit

1 = ADC module is enabled

0 = ADC module is disabled

Note: The ON bit should be set only after the ADC module has been configured.

bit 14 Unimplemented: Read as ‘0’

Section 22. 12-bit High-Speed SAR ADC

bit 13 SIDL: Stop in Idle Mode bit

1 = Discontinue module operation when the device enters Idle mode

0 = Continue module operation in Idle mode

bit 12 AICPMPEN: Analog Input Charge Pump Enable bit

1 = Analog input charge pump is enabled (default)

0 = Analog input charge pump is disabled

bit 11 CVDEN: Capacitive Voltage Division Enable bit

1 = CVD operation is enabled

0 = CVD operation is disabled

bit 10 FSSCLKEN: Fast Synchronous System Clock to ADC Control Clock bit

1 = Fast synchronous system clock to ADC control clock is enabled

0 = Fast synchronous system clock to ADC control clock is disabled

bit 9 FSPBCLKEN: Fast Synchronous Peripheral Clock to ADC Control Clock bit

1 = Fast synchronous peripheral clock to ADC control clock is enabled

0 = Fast synchronous peripheral clock to ADC control clock is disabled

bit 8-7 Unimplemented: Read as ‘0’

bit 6-4 IRQVS<2:0>: Interrupt Vector Shift bits

To determine interrupt vector address, this bit specifies the amount of left shift done to the ARDYx status

bits in the ADCDSTAT1 and ADCDSTAT2 registers, prior to adding with the ADCBASE register (see

22.6.2 “ADC Base Register (ADCBASE) Usage” for more information).

Interrupt Vector Address = Read Value of ADCBASE = Value written to ADCBASE + x << IRQVS<2:0>,

where ‘x’ is the smallest active input ID from the ADCDSTAT1 or ADCDSTAT2 registers (which has highest

priority).

111 = Shift x left 7 bit position

110 = Shift x left 6 bit position

101 = Shift x left 5 bit position

100 = Shift x left 4 bit position

011 = Shift x left 3 bit position

010 = Shift x left 2 bit position

001 = Shift x left 1 bit position

000 = Shift x left 0 bit position

bit 3 STRGLVL: Scan Trigger High Level/Positive Edge Sensitivity bit

1= Scan trigger is high level sensitive. Once STRIG mode is selected (TRGSRCx<4:0> in the ADCTRGx

0= Scan trigger is positive edge sensitive. Once STRIG mode is selected (TRGSRCx<4:0> in the

ADCTRGx register), only a single scan trigger will be generated, which will complete the scan of all

selected analog inputs.

bit 2-0 DMABL<2:0>: DMA Buffer Length Size bits

111 = Allocates 128 locations in RAM to each analog input

110 = Allocates 64 locations in RAM to each analog input

101 = Allocates 32 locations in RAM to each analog input

100 = Allocates 16 locations in RAM to each analog input

011 = Allocates 8 locations in RAM to each analog input

010 = Allocates 4 locations in RAM to each analog input

001 = Allocates 2 locations in RAM to each analog input

000 = Allocates 1 location in RAM to each analog input

Note: Since each output data is 16-bit wide, one location consists of 2 bytes.

PIC32 Family Reference Manual

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R-0, HS, HC R-0, HS, HC R-0, HS, HC R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

BGVRRDY REFFLT EOSRDY CVDCPL<2:0> SAMC<9:9>

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

SAMC<7:0>

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

BGVRIEN REFFLTIEN EOSIEN ADCEIOVR ECRIEN ADCEIS<2:0>

7:0

U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— ADCDIV<6:0>

Legend: HC = Hardware Set HS = Hardware Cleared r = Reserved

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 BGVRRDY: Band Gap Voltage/ADC Reference Voltage Status bit

1 = Both band gap voltage and ADC reference voltages (V

REF

) are ready

0 = Either or both band gap voltage and ADC reference voltages (V

REF

) are not ready

Data processing is valid only after the BGVRRDY bit is set by hardware, hence the application code must

check that the BGVRRDY bit is set to ensure data validity. This bit is set to ‘ ’ when the ON bit0

(ADCCON1<15>) = 0.

bit 30 REFFLT: Band Gap/V

REF

/AV

BOR Fault Status bit

1 = Fault in band gap or the V

REF

voltage while the ON bit (ADCCON1<15>) was set. Most likely a band

gap or V

REF

fault will be caused by a BOR of the analog V

supply.

0 = Band gap and V

REF

voltage are working properly

This bit is cleared when the ON bit (ADCCON1<15>) = 0 and the BGVRRDY bit = 1.

bit 29 EOSRDY: End of Scan Interrupt Status bit

1 = All analog inputs are considered for scanning through the scan trigger (all analog inputs specified in

the ADCCSS1 and ADCCSS2 registers) have completed scanning

0 = Scanning has not completed

This bit is cleared when ADCCON2<31:24> are read in software.

bit 28-26 CVDCPL<2:0>: Capacitor Voltage Divider (CVD) Setting bit

111 = 7 * 2.5 pF = 17.5 pF

110 = 6 * 2.5 pF = 15 pF

101 = 5 * 2.5 pF = 12.5 pF

100 = 4 * 2.5 pF = 10 pF

011 = 3 * 2.5 pF = 7.5 pF

010 = 2 * 2.5 pF = 5 pF

001 = 1 * 2.5 pF = 2.5 pF

000 = 0 * 2.5 pF = 0 pF

bit 25-16 SAMC<9:0>: Sample Time for the Shared ADC bits

1111111111 = 1025 T

•

0000000001 = 3 T

0000000000 = 2 T

Where T

= period of the ADC conversion clock for the Shared ADC controlled by the ADCDIV<6:0> bits.

bit 15 BGVRIEN: Band Gap/V

REF

Voltage Ready Interrupt Enable bit

1 = Interrupt will be generated when the BGVRRDY bit is set

0 = No interrupt is generated when the BGVRRDY bit is set

Section 22. 12-bit High-Speed SAR ADC

bit 14 REFFLTIEN: Band Gap/V

REF

Voltage Fault Interrupt Enable bit

1 = Interrupt will be generated when the REFFLT bit is set

0 = No interrupt is generated when the REFFLT bit is set

bit 13 EOSIEN: End of Scan Interrupt Enable bit

1 = Interrupt will be generated when EOSRDY bit is set

0 = No interrupt is generated when the EOSRDY bit is set

bit 12 ADCEIOVR: Early Interrupt Request Override bit

1 = Early interrupt generation is overridden and interrupt generation is controlled by the ADCGIRQEN1

and ADCGIRQEN2 registers

0 = Early interrupt generation is not overridden and interrupt generation is controlled by the ADCEIEN1

and ADCEIEN2 registers

bit 11 ECRIEN: External Conversion Request Interface Enable bit

1 = Enables ADC conversion start from external module (such as PTG)

0 = External modules cannot start ADC conversion

bit 10-8 ADCEIS<2:0>: Shared ADC Early Interrupt Select bits

These bits select the number of clocks (T

)

prior to the arrival of valid data that the associated interrupt

is generated.

111 = The data ready interrupt is generated 8 ADC clocks prior to end of conversion

110 = The data ready interrupt is generated 7 ADC clocks prior to end of conversion

•

001 = The data ready interrupt is generated 2 ADC module clocks prior to end of conversion

000 = The data ready interrupt is generated 1 ADC module clock prior to end of conversion

Note: All options are available when the selected resolution, set by the SELRES<1:0> bits

(ADCCON1<22:21>), is 12-bit or 10-bit. For a selected resolution of 8-bit, options from ‘000’ to

‘101’ are valid. For a selected resolution of 6-bit, options from ‘000’ to ‘011’ are valid.

bit 7 Unimplemented: Read as ‘0’

bit 6-0 ADCDIV<6:0>: Shared ADC Clock Divider bits

1111111 = 254 * T

= T

•

0000011 = 6 * T

= T

0000010 = 4 * T

= T

0000001 = 2 * T

= T

0000000 = Reserved

The ADCDIV<6:0> bits divide the ADC control clock (T

) to generate the clock for the Shared ADC (T

PIC32 Family Reference Manual

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

ADCSEL<1:0> CONCLKDIV<5:0>

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIGEN7

(5)

DIGEN6

(5)

DIGEN5

(5)

DIGEN4

(5)

DIGEN3

(5)

DIGEN2

(5)

DIGEN1

(5)

DIGEN0

(5)

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R-0, HS, HC R/W-0 R-0, HS, HC

VREFSEL<2:0> TRGSUSP UPDIEN UPDRDY SAMP

(1,2,3,4)

RQCNVRT

7:0

R/W-0 R-0, HS, HC R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

GLSWTRG GSWTRG ADINSEL<5:0>

(5)

Legend: HC = Hardware Set HS = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-30 ADCSEL<1:0>: Analog-to-Digital Clock Source (T

CLK

) bits

Refer to the “12-bit High-Speed Successive Approximation Register (SAR)” chapter in the specific

device data sheet for the ADC Clock source selections.

bit 29-24 CONCLKDIV<5:0>: Analog-to-Digital Control Clock (T

) Divider bits

111111 = 126 * T

CLK

= T

•

000011 = 6 * T

CLK

= T

000010 = 4 * T

CLK

= T

000001 = 2 * T

CLK

= T

000000 = T

CLK

= T

bit 23 DIGEN7: ADC7 Digital Enable bit

(5)

1 = ADC7 is digital enabled

0 = ADC7 is digital disabled

bit 22 DIGEN6: ADC6 Digital Enable bit

(5)

1 = ADC6 is digital enabled

0 = ADC6 is digital disabled

bit 21 DIGEN5: ADC5 Digital Enable bit

(5)

1 = ADC5 is digital enabled

0 = ADC5 is digital disabled

bit 20 DIGEN4: ADC4 Digital Enable bit

(5)

1 = ADC4 is digital enabled

0 = ADC4 is digital disabled

Note 1: The SAMP bit has the highest priority and setting this bit will keep the S&H circuit in Sample mode until the

bit is cleared. Also, usage of the SAMP bit will cause settings of the SAMC<9:0> bits (ADCCON2<25:16>)

to be ignored.

2: The SAMP bit only connects Class 2 and Class 3 analog inputs to the shared ADC. All Class 1 analog

inputs are not affected by the SAMP bit.

3: The SAMP bit is not a self-clearing bit and it is the responsibility of application software to first clear this bit

and only after setting the RQCNVRT bit to start the analog-to-digital conversion.

4: Normally, when the SAMP and RQCNVRT bits are used by software routines, all TRGSRCx<4:0> bits and

STRGSRC<4:0> bits should be set to ‘00000’ to disable all external hardware triggers and prevent them

from interfering with the software-controlled sampling command signal SAMP and with the

software-controlled trigger RQCNVRT.

5: Depending on the device, the function will vary. Refer to the “ADC” chapter in the specific device data

sheet to determine the function that is available for your device.

Section 22. 12-bit High-Speed SAR ADC

bit 19 DIGEN3: ADC3 Digital Enable bit

(5)

1 = ADC3 is digital enabled

0 = ADC3 is digital disabled

bit 18 DIGEN2: ADC2 Digital Enable bit

(5)

1 = ADC2 is digital enabled

0 = ADC2 is digital disabled

bit 17 DIGEN1: ADC1 Digital Enable bit

(5)

1 = ADC1 is digital enabled

0 = ADC1 is digital disabled

bit 16 DIGEN0: ADC0 Digital Enable bit

(5)

1 = ADC0 is digital enabled

0 = ADC0 is digital disabled

bit 15-13 VREFSEL<2:0>: Voltage Reference (V

REF

) Input Selection bits

bit 12 TRGSUSP: Trigger Suspend bit

1 = Triggers are blocked from starting a new analog-to-digital conversion, but the ADC module is not disabled

0 = Triggers are not blocked

bit 11 UPDIEN: Update Ready Interrupt Enable bit

1 = Interrupt will be generated when the UPDRDY bit is set by hardware

0 = No interrupt is generated

bit 10 UPDRDY: ADC Update Ready Status bit

1 = ADC SFRs can be updated

0 = ADC SFRs cannot be updated

Note: This bit is only active while the TRGSUSP bit is set and there are no more running conversions of

any ADC modules.

bit 9 SAMP: Class 2 and Class 3 Analog Input Sampling Enable bit

(1,2,3,4)

1 = The ADC S&H amplifier is sampling

0 = The ADC S&H amplifier is holding

Note 1: The SAMP bit has the highest priority and setting this bit will keep the S&H circuit in Sample mode until the

bit is cleared. Also, usage of the SAMP bit will cause settings of the SAMC<9:0> bits (ADCCON2<25:16>)

to be ignored.

2: The SAMP bit only connects Class 2 and Class 3 analog inputs to the shared ADC. All Class 1 analog

inputs are not affected by the SAMP bit.

3: The SAMP bit is not a self-clearing bit and it is the responsibility of application software to first clear this bit

and only after setting the RQCNVRT bit to start the analog-to-digital conversion.

4: Normally, when the SAMP and RQCNVRT bits are used by software routines, all TRGSRCx<4:0> bits and

STRGSRC<4:0> bits should be set to ‘00000’ to disable all external hardware triggers and prevent them

from interfering with the software-controlled sampling command signal SAMP and with the

software-controlled trigger RQCNVRT.

5: Depending on the device, the function will vary. Refer to the “ADC” chapter in the specific device data

sheet to determine the function that is available for your device.

VREFSEL<2:0> AD

REF

+ AD

REF

111 AV

Internal V

REFL

110 Internal V

REFH

101 Internal V

REFH

External V

REFL

100 Internal V

REFH

Internal V

REFL

011 External V

REFH

External V

REFL

010 AV

External V

REFL

001 External V

REFH

AVss

000 AV

AVss

PIC32 Family Reference Manual

bit 8 RQCNVRT: Individual ADC Input Conversion Request bit

This bit and its associated ADINSEL<5:0> bits enable the user to individually request an analog-to-digital

conversion of an analog input through software.

1 = Trigger the conversion of the selected ADC input as specified by the ADINSEL<5:0> bits

0 = Do not trigger the conversion

Note: This bit is automatically cleared in the next ADC clock cycle.

bit 7 GLSWTRG: Global Level Software Trigger bit

1 = Trigger conversion for ADC inputs that have selected the GLSWTRG bit as the trigger signal, either

through the associated TRGSRC<4:0> bits in the ADCTRGx registers or through the STRGSRC<4:0>

bits in the ADCCON1 register

0 = Do not trigger an analog-to-digital conversion

bit 6 GSWTRG: Global Software Trigger bit

1 = Trigger conversion for ADC inputs that have selected the GSWTRG bit as the trigger signal, either

through the associated TRGSRC<4:0> bits in the ADCTRGx registers or through the STRGSRC<4:0>

bits in the ADCCON1 register

0 = Do not trigger an analog-to-digital conversion

Note: This bit is automatically cleared in the next ADC clock cycle.

bit 5-0 ADINSEL<5:0>: Analog Input Select bits

(5)

These bits select the analog input to be converted when the RQCNVRT bit is set, where, MAX_AN_INPUT

is the maximum analog inputs available on the device.

MAX_AN_INPUT + 4 = Device dependent (see Note 5)

MAX_AN_INPUT + 3 = Device dependent (see Note 5)

MAX_AN_INPUT + 2 = Device dependent (see Note 5)

MAX_AN_INPUT + 1 = Device dependent (see Note 5)

MAX_AN_INPUT = AN[MAX_AN_INPUT]

•

000001 = AN1

000000 = AN0

Note 1: The SAMP bit has the highest priority and setting this bit will keep the S&H circuit in Sample mode until the

bit is cleared. Also, usage of the SAMP bit will cause settings of the SAMC<9:0> bits (ADCCON2<25:16>)

to be ignored.

2: The SAMP bit only connects Class 2 and Class 3 analog inputs to the shared ADC. All Class 1 analog

inputs are not affected by the SAMP bit.

3: The SAMP bit is not a self-clearing bit and it is the responsibility of application software to first clear this bit

and only after setting the RQCNVRT bit to start the analog-to-digital conversion.

4: Normally, when the SAMP and RQCNVRT bits are used by software routines, all TRGSRCx<4:0> bits and

STRGSRC<4:0> bits should be set to ‘00000’ to disable all external hardware triggers and prevent them

from interfering with the software-controlled sampling command signal SAMP and with the

software-controlled trigger RQCNVRT.

5: Depending on the device, the function will vary. Refer to the “ADC” chapter in the specific device data

sheet to determine the function that is available for your device.

Section 22. 12-bit High-Speed SAR ADC

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — SH6ALT<1:0> SH5ALT<1:0> SH4ALT<1:0>

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

SH3ALT<1:0> SH2ALT<1:0> SH1ALT<1:0> SH0ALT<1:0>

15:8

U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— STRGEN6 STRGEN5 STRGEN4 STRGEN3 STRGEN2 STRGEN1 STRGEN0

7:0

U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— SSAMPEN6 SSAMPEN5 SSAMPEN4 SSAMPEN3 SSAMPEN2 SSAMPEN1 SSAMPEN0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-30 Unimplemented: Read as ‘ ’

bit 29-28 SH6ALT<1:0>: ADC6 Analog Input Select bit

11 01 - = Refer to the “ADC” chapter in the specific device data sheet for the available selections

00 = AN6

bit 27-26 SH5ALT<1:0>: ADC5 Analog Input Select bit

11 01 - = Refer to the “ADC” chapter in the specific device data sheet for the available selections

00 = AN5

bit 25-24 SH4ALT<1:0>: ADC4 Analog Input Select bit

11 01 - = Refer to the “ADC” chapter in the specific device data sheet for the available selections

00 = AN4

bit 23-22 SH3ALT<1:0>: ADC3 Analog Input Select bit

11 01 - = Refer to the “ADC” chapter in the specific device data sheet for the available selections

00 = AN3

bit 21-20 SH2ALT<1:0>: ADC2 Analog Input Select bit

11 01 - = Refer to the “ADC” chapter in the specific device data sheet for the available selections

00 = AN2

bit 19-18 SH1ALT<1:0>: ADC1 Analog Input Select bit

11 01 - = Refer to the “ADC” chapter in the specific device data sheet for the available selections

00 = AN1

bit 17-16 SH0ALT<1:0>: ADC0 Analog Input Select bit

11 01 - = Refer to the “ADC” chapter in the specific device data sheet for the available selections

00 = AN0

bit 15 Unimplemented: Read as ‘ ’

bit 14 STRGEN6: ADC6 Presynchronized Triggers bit

1 = ADC6 uses presynchronized triggers

0 = ADC6 does not use presynchronized triggers

bit 13 STRGEN5: ADC5 Presynchronized Triggers bit

1 = ADC5 uses presynchronized triggers

0 = ADC5 does not use presynchronized triggers

bit 12 STRGEN4: ADC4 Presynchronized Triggers bit

1 = ADC4 uses presynchronized triggers

0 = ADC4 does not use presynchronized triggers

bit 11 STRGEN3: ADC3 Presynchronized Triggers bit

1 = ADC3 uses presynchronized triggers

0 = ADC3 does not use presynchronized triggers

PIC32 Family Reference Manual

bit 10 STRGEN2: ADC2 Presynchronized Triggers bit

1 = ADC2 uses presynchronized triggers

0 = ADC2 does not use presynchronized triggers

bit 9 STRGEN1: ADC1 Presynchronized Triggers bit

1 = ADC1 uses presynchronized triggers

0 = ADC1 does not use presynchronized triggers

bit 8 STRGEN0: ADC0 Presynchronized Triggers bit

1 = ADC0 uses presynchronized triggers

0 = ADC0 does not use presynchronized triggers

bit 7 Unimplemented: Read as ‘ ’

bit 6 SSAMPEN6: ADC6 Synchronous Sampling bit

1 = ADC6 uses synchronous sampling for the first sample after being idle or disabled

0 = ADC6 does not use synchronous sampling

bit 5 SSAMPEN5: ADC5 Synchronous Sampling bit

1 = ADC5 uses synchronous sampling for the first sample after being idle or disabled

0 = ADC5 does not use synchronous sampling

bit 4 SSAMPEN4: ADC4 Synchronous Sampling bit

1 = ADC4 uses synchronous sampling for the first sample after being idle or disabled

0 = ADC4 does not use synchronous sampling

bit 3 SSAMPEN3: ADC3 Synchronous Sampling bit

1 = ADC3 uses synchronous sampling for the first sample after being idle or disabled

0 = ADC3 does not use synchronous sampling

bit 2 SSAMPEN2: ADC2Synchronous Sampling bit

1 = ADC2 uses synchronous sampling for the first sample after being idle or disabled

0 = ADC2 does not use synchronous sampling

bit 1 SSAMPEN1: ADC1 Synchronous Sampling bit

1 = ADC1 uses synchronous sampling for the first sample after being idle or disabled

0 = ADC1 does not use synchronous sampling

bit 0 SSAMPEN0: ADC0 Synchronous Sampling bit

1 = ADC0 uses synchronous sampling for the first sample after being idle or disabled

0 = ADC0 does not use synchronous sampling

Section 22. 12-bit High-Speed SAR ADC

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF15 SIGN15 DIFF14 SIGN14 DIFF13 SIGN13 DIFF12 SIGN12

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF11 SIGN11 DIFF10 SIGN10 DIFF9 SIGN9 DIFF8 SIGN8

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF7 SIGN7 DIFF6 SIGN6 DIFF5 SIGN5 DIFF4 SIGN4

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF3 SIGN3 DIFF2 SIGN2 DIFF1 SIGN1 DIFF0 SIGN0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 DIFF15: AN15 Mode bit

1 = AN15 is using Differential mode

0 = AN15 is using Single-ended mode

bit 30 SIGN:15 AN15 Signed Data Mode bit

1 = AN15 is using Signed Data mode

0 = AN15 is using Unsigned Data mode

bit 29 DIFF14: AN14 Mode bit

1 = AN14 is using Differential mode

0 = AN14 is using Single-ended mode

bit 28 SIGN14: AN14 Signed Data Mode bit

1 = AN14 is using Signed Data mode

0 = AN14 is using Unsigned Data mode

bit 27 DIFF13: AN13 Mode bit

1 = AN13 is using Differential mode

0 = AN13 is using Single-ended mode

bit 26 SIGN13: AN13 Signed Data Mode bit

1 = AN13 is using Signed Data mode

0 = AN13 is using Unsigned Data mode

bit 25 DIFF12: AN12 Mode bit

1 = AN12 is using Differential mode

0 = AN12 is using Single-ended mode

bit 24 SIGN12: AN12 Signed Data Mode bit

1 = AN12 is using Signed Data mode

0 = AN12 is using Unsigned Data mode

bit 23 DIFF11: AN11 Mode bit

1 = AN11 is using Differential mode

0 = AN11 is using Single-ended mode

bit 22 SIGN11: AN11 Signed Data Mode bit

1 = AN11 is using Signed Data mode

0 = AN11 is using Unsigned Data mode

bit 21 DIFF10: AN10 Mode bit

1 = AN10 is using Differential mode

0 = AN10 is using Single-ended mode

PIC32 Family Reference Manual

bit 20 SIGN10: AN10 Signed Data Mode bit

1 = AN10 is using Signed Data mode

0 = AN10 is using Unsigned Data mode

bit 19 DIFF9: AN9 Mode bit

1 = AN9 is using Differential mode

0 = AN9 is using Single-ended mode

bit 18 SIGN9: AN9 Signed Data Mode bit

1 = AN9 is using Signed Data mode

0 = AN9 is using Unsigned Data mode

bit 17 DIFF8: AN 8 Mode bit

1 = AN8 is using Differential mode

0 = AN8 is using Single-ended mode

bit 16 SIGN8: AN8 Signed Data Mode bit

1 = AN8 is using Signed Data mode

0 = AN8 is using Unsigned Data mode

bit 15 DIFF7: AN7 Mode bit

1 = AN7 is using Differential mode

0 = AN7 is using Single-ended mode

bit 14 SIGN7: AN7 Signed Data Mode bit

1 = AN7 is using Signed Data mode

0 = AN7 is using Unsigned Data mode

bit 13 DIFF6: AN6 Mode bit

1 = AN6 is using Differential mode

0 = AN6 is using Single-ended mode

bit 12 SIGN6: AN6 Signed Data Mode bit

1 = AN6 is using Signed Data mode

0 = AN6 is using Unsigned Data mode

bit 11 DIFF5: AN5 Mode bit

1 = AN5 is using Differential mode

0 = AN5 is using Single-ended mode

bit 10 SIGN5: AN5 Signed Data Mode bit

1 = AN5 is using Signed Data mode

0 = AN5 is using Unsigned Data mode

bit 9 DIFF4: AN4 Mode bit

1 = AN4 is using Differential mode

0 = AN4 is using Single-ended mode

bit 8 SIGN4: AN4 Signed Data Mode bit

1 = AN4 is using Signed Data mode

0 = AN4 is using Unsigned Data mode

bit 7 DIFF3: AN3 Mode bit

1 = AN3 is using Differential mode

0 = AN3 is using Single-ended mode

bit 6 SIGN3: AN3 Signed Data Mode bit

1 = AN3 is using Signed Data mode

0 = AN3 is using Unsigned Data mode

bit 5 DIFF2: AN2 Mode bit

1 = AN2 is using Differential mode

0 = AN2 is using Single-ended mode

Section 22. 12-bit High-Speed SAR ADC

bit 4 SIGN2: AN2 Signed Data Mode bit

1 = AN2 is using Signed Data mode

0 = AN2 is using Unsigned Data mode

bit 3 DIFF1: AN1 Mode bit

1 = AN1 is using Differential mode

0 = AN1 is using Single-ended mode

bit 2 SIGN1: AN1 Signed Data Mode bit

1 = AN1 is using Signed Data mode

0 = AN1 is using Unsigned Data mode

bit 1 DIFF0: AN0 Mode bit

1 = AN0 is using Differential mode

0 = AN0 is using Single-ended mode

bit 0 SIGN0: AN0 Signed Data Mode bit

1 = AN0 is using Signed Data mode

0 = AN0 is using Unsigned Data mode

PIC32 Family Reference Manual

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF31 SIGN31 DIFF30 SIGN30 DIFF29 SIGN29 DIFF28 SIGN28

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF27 SIGN27 DIFF26 SIGN26 DIFF25 SIGN25 DIFF24 SIGN24

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF23 SIGN23 DIFF22 SIGN22 DIFF21 SIGN21 DIFF20 SIGN20

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF19 SIGN19 DIFF18 SIGN18 DIFF17 SIGN17 DIFF16 SIGN16

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 DIFF31: AN31 Mode bit

1 = AN31 is using Differential mode

0 = AN31 is using Single-ended mode

bit 30 SIGN31: AN31 Signed Data Mode bit

1 = AN31 is using Signed Data mode

0 = AN31 is using Unsigned Data mode

bit 29 DIFF30: AN30 Mode bit

1 = AN30 is using Differential mode

0 = AN30 is using Single-ended mode

bit 28 SIGN30: AN30 Signed Data Mode bit

1 = AN30 is using Signed Data mode

0 = AN30 is using Unsigned Data mode

bit 27 DIFF29: AN29 Mode bit

1 = AN29 is using Differential mode

0 = AN29 is using Single-ended mode

bit 26 SIGN29: AN29 Signed Data Mode bit

1 = AN29 is using Signed Data mode

0 = AN29 is using Unsigned Data mode

bit 25 DIFF28: AN28 Mode bit

1 = AN28 is using Differential mode

0 = AN28 is using Single-ended mode

bit 24 SIGN28: AN28 Signed Data Mode bit

1 = AN28 is using Signed Data mode

0 = AN28 is using Unsigned Data mode

bit 23 DIFF27: AN27 Mode bit

1 = AN27 is using Differential mode

0 = AN27 is using Single-ended mode

bit 22 SIGN27: AN27 Signed Data Mode bit

1 = AN27 is using Signed Data mode

0 = AN27 is using Unsigned Data mode

bit 21 DIFF26: AN26 Mode bit

1 = AN26 is using Differential mode

0 = AN26 is using Single-ended mode

Section 22. 12-bit High-Speed SAR ADC

bit 20 SIGN26: AN26 Signed Data Mode bit

1 = AN26 is using Signed Data mode

0 = AN26 is using Unsigned Data mode

bit 19 DIFF25: AN25 Mode bit

1 = AN25 is using Differential mode

0 = AN25 is using Single-ended mode

bit 18 SIGN25: AN25 Signed Data Mode bit

1 = AN25 is using Signed Data mode

0 = AN25 is using Unsigned Data mode

bit 17 DIFF24: AN24 Mode bit

1 = AN24 is using Differential mode

0 = AN24 is using Single-ended mode

bit 16 SIGN24: AN24 Signed Data Mode bit

1 = AN24 is using Signed Data mode

0 = AN24 is using Unsigned Data mode

bit 15 DIFF23: AN23 Mode bit

1 = AN23 is using Differential mode

0 = AN23 is using Single-ended mode

bit 14 SIGN23: AN23 Signed Data Mode bit

1 = AN23 is using Signed Data mode

0 = AN23 is using Unsigned Data mode

bit 13 DIFF22: AN22 Mode bit

1 = AN22 is using Differential mode

0 = AN22 is using Single-ended mode

bit 12 SIGN22: AN22 Signed Data Mode bit

1 = AN22 is using Signed Data mode

0 = AN22 is using Unsigned Data mode

bit 11 DIFF21: AN21 Mode bit

1 = AN21 is using Differential mode

0 = AN21 is using Single-ended mode

bit 10 SIGN21: AN21 Signed Data Mode bit

1 = AN21 is using Signed Data mode

0 = AN21 is using Unsigned Data mode

bit 9 DIFF20: AN20 Mode bit

1 = AN20 is using Differential mode

0 = AN20 is using Single-ended mode

bit 8 SIGN20: AN20 Signed Data Mode bit

1 = AN20 is using Signed Data mode

0 = AN20 is using Unsigned Data mode

bit 7 DIFF19: AN19 Mode bit

1 = AN19 is using Differential mode

0 = AN19 is using Single-ended mode

bit 6 SIGN19: AN19 Signed Data Mode bit

1 = AN19 is using Signed Data mode

0 = AN19 is using Unsigned Data mode

bit 5 DIFF18: AN18 Mode bit

1 = AN18 is using Differential mode

0 = AN18 is using Single-ended mode

PIC32 Family Reference Manual

bit 4 SIGN18: AN18 Signed Data Mode bit

1 = AN18 is using Signed Data mode

0 = AN18 is using Unsigned Data mode

bit 3 DIFF17: AN17 Mode bit

1 = AN17 is using Differential mode

0 = AN17 is using Single-ended mode

bit 2 SIGN17: AN17 Signed Data Mode bit

1 = AN17 is using Signed Data mode

0 = AN17 is using Unsigned Data mode

bit 1 DIFF16: AN16 Mode bit

1 = AN16 is using Differential mode

0 = AN16 is using Single-ended mode

bit 0 SIGN16: AN16 Signed Data Mode bit

1 = AN16 is using Signed Data mode

0 = AN16 is using Unsigned Data mode

Section 22. 12-bit High-Speed SAR ADC

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF47 SIGN47 DIFF46 SIGN46 DIFF45 SIGN45 DIFF44 SIGN44

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF43 SIGN43 DIFF42 SIGN42 DIFF41 SIGN41 DIFF40 SIGN40

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF39 SIGN39 DIFF38 SIGN38 DIFF37 SIGN37 DIFF36 SIGN36

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF35 SIGN35 DIFF34 SIGN34 DIFF33 SIGN33 DIFF32 SIGN32

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 DIFF47: AN47 Mode bit

1 = AN47 is using Differential mode

0 = AN47 is using Single-ended mode

bit 30 SIGN47: AN47 Signed Data Mode bit

1 = AN47 is using Signed Data mode

0 = AN47 is using Unsigned Data mode

bit 29 DIFF46: AN46 Mode bit

1 = AN46 is using Differential mode

0 = AN46 is using Single-ended mode

bit 28 SIGN46: AN46 Signed Data Mode bit

1 = AN46 is using Signed Data mode

0 = AN46 is using Unsigned Data mode

bit 27 DIFF45: AN45 Mode bit

1 = AN45 is using Differential mode

0 = AN45 is using Single-ended mode

bit 26 SIGN45: AN45 Signed Data Mode bit

1 = AN45 is using Signed Data mode

0 = AN45 is using Unsigned Data mode

bit 25 DIFF44: AN44 Mode bit

1 = AN44 is using Differential mode

0 = AN44 is using Single-ended mode

bit 24 SIGN44: AN44 Signed Data Mode bit

1 = AN44 is using Signed Data mode

0 = AN44 is using Unsigned Data mode

bit 23 DIFF43: AN43 Mode bit

1 = AN43 is using Differential mode

0 = AN43 is using Single-ended mode

bit 22 SIGN43: AN43 Signed Data Mode bit

1 = AN43 is using Signed Data mode

0 = AN43 is using Unsigned Data mode

bit 21 DIFF42: AN42 Mode bit

1 = AN42 is using Differential mode

0 = AN42 is using Single-ended mode

PIC32 Family Reference Manual

bit 20 SIGN42: AN42 Signed Data Mode bit

1 = AN42 is using Signed Data mode

0 = AN42 is using Unsigned Data mode

bit 19 DIFF41: AN41 Mode bit

1 = AN41 is using Differential mode

0 = AN41 is using Single-ended mode

bit 18 SIGN41: AN41 Signed Data Mode bit

1 = AN41 is using Signed Data mode

0 = AN41 is using Unsigned Data mode

bit 17 DIFF40: AN40 Mode bit

1 = AN40 is using Differential mode

0 = AN40 is using Single-ended mode

bit 16 SIGN40: AN40 Signed Data Mode bit

1 = AN40 is using Signed Data mode

0 = AN40 is using Unsigned Data mode

bit 15 DIFF39: AN39 Mode bit

1 = AN39 is using Differential mode

0 = AN39 is using Single-ended mode

bit 14 SIGN39: AN39 Signed Data Mode bit

1 = AN39 is using Signed Data mode

0 = AN39 is using Unsigned Data mode

bit 13 DIFF38: AN38 Mode bit

1 = AN38 is using Differential mode

0 = AN38 is using Single-ended mode

bit 12 SIGN38: AN38 Signed Data Mode bit

1 = AN38 is using Signed Data mode

0 = AN38 is using Unsigned Data mode

bit 11 DIFF37: AN37 Mode bit

1 = AN37 is using Differential mode

0 = AN37 is using Single-ended mode

bit 10 SIGN37: AN37 Signed Data Mode bit

1 = AN37 is using Signed Data mode

0 = AN37 is using Unsigned Data mode

bit 9 DIFF36: AN36 Mode bit

1 = AN36 is using Differential mode

0 = AN36 is using Single-ended mode

bit 8 SIGN36: AN36 Signed Data Mode bit

1 = AN36 is using Signed Data mode

0 = AN36 is using Unsigned Data mode

bit 7 DIFF35: AN35 Mode bit

1 = AN35 is using Differential mode

0 = AN35 is using Single-ended mode

bit 6 SIGN35: AN35 Signed Data Mode bit

1 = AN35 is using Signed Data mode

0 = AN35 is using Unsigned Data mode

bit 5 DIFF34: AN34 Mode bit

1 = AN34 is using Differential mode

0 = AN34 is using Single-ended mode

Section 22. 12-bit High-Speed SAR ADC

bit 4 SIGN34: AN34 Signed Data Mode bit

1 = AN34 is using Signed Data mode

0 = AN34 is using Unsigned Data mode

bit 3 DIFF33: AN33 Mode bit

1 = AN33 is using Differential mode

0 = AN33 is using Single-ended mode

bit 2 SIGN33: AN33 Signed Data Mode bit

1 = AN33 is using Signed Data mode

0 = AN33 is using Unsigned Data mode

bit 1 DIFF32: AN32 Mode bit

1 = AN32 is using Differential mode

0 = AN32 is using Single-ended mode

bit 0 SIGN32: AN32 Signed Data Mode bit

1 = AN32 is using Signed Data mode

0 = AN32 is using Unsigned Data mode

PIC32 Family Reference Manual

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF63 SIGN63 DIFF62 SIGN62 DIFF61 SIGN61 DIFF60 SIGN60

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF59 SIGN59 DIFF58 SIGN58 DIFF57 SIGN57 DIFF56 SIGN56

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF55 SIGN55 DIFF54 SIGN54 DIFF53 SIGN53 DIFF52 SIGN52

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DIFF51 SIGN51 DIFF50 SIGN50 DIFF49 SIGN49 DIFF48 SIGN48

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 DIFF63: AN63 Mode bit

1 = AN63 is using Differential mode

0 = AN63 is using Single-ended mode

bit 30 SIGN63: AN63 Signed Data Mode bit

1 = AN63 is using Signed Data mode

0 = AN63 is using Unsigned Data mode

bit 29 DIFF62: AN62 Mode bit

1 = AN62 is using Differential mode

0 = AN62 is using Single-ended mode

bit 28 SIGN62: AN62 Signed Data Mode bit

1 = AN62 is using Signed Data mode

0 = AN62 is using Unsigned Data mode

bit 27 DIFF61: AN61 Mode bit

1 = AN61 is using Differential mode

0 = AN61 is using Single-ended mode

bit 26 SIGN61: AN61 Signed Data Mode bit

1 = AN61 is using Signed Data mode

0 = AN61 is using Unsigned Data mode

bit 25 DIFF60: AN60 Mode bit

1 = AN60 is using Differential mode

0 = AN60 is using Single-ended mode

bit 24 SIGN60: AN60 Signed Data Mode bit

1 = AN60 is using Signed Data mode

0 = AN60 is using Unsigned Data mode

bit 23 DIFF59: AN59 Mode bit

1 = AN59 is using Differential mode

0 = AN59 is using Single-ended mode

bit 22 SIGN59: AN59 Signed Data Mode bit

1 = AN59 is using Signed Data mode

0 = AN59 is using Unsigned Data mode

bit 21 DIFF58: AN58 Mode bit

1 = AN58 is using Differential mode

0 = AN58 is using Single-ended mode

Section 22. 12-bit High-Speed SAR ADC

bit 20 SIGN58: AN58 Signed Data Mode bit

1 = AN58 is using Signed Data mode

0 = AN58 is using Unsigned Data mode

bit 19 DIFF57: AN57 Mode bit

1 = AN57 is using Differential mode

0 = AN57 is using Single-ended mode

bit 18 SIGN57: AN57 Signed Data Mode bit

1 = AN57 is using Signed Data mode

0 = AN57 is using Unsigned Data mode

bit 17 DIFF56: AN56 Mode bit

1 = AN56 is using Differential mode

0 = AN56 is using Single-ended mode

bit 16 SIGN56: AN56 Signed Data Mode bit

1 = AN56 is using Signed Data mode

0 = AN56 is using Unsigned Data mode

bit 15 DIFF55: AN55 Mode bit

1 = AN55 is using Differential mode

0 = AN55 is using Single-ended mode

bit 14 SIGN55: AN55 Signed Data Mode bit

1 = AN55 is using Signed Data mode

0 = AN55 is using Unsigned Data mode

bit 13 DIFF54: AN54 Mode bit

1 = AN54 is using Differential mode

0 = AN54 is using Single-ended mode

bit 12 SIGN54: AN54 Signed Data Mode bit

1 = AN54 is using Signed Data mode

0 = AN54 is using Unsigned Data mode

bit 11 DIFF53: AN53 Mode bit

1 = AN53 is using Differential mode

0 = AN53 is using Single-ended mode

bit 10 SIGN53: AN53 Signed Data Mode bit

1 = AN53 is using Signed Data mode

0 = AN53 is using Unsigned Data mode

bit 9 DIFF52: AN52 Mode bit

1 = AN52 is using Differential mode

0 = AN52 is using Single-ended mode

bit 8 SIGN52: AN52 Signed Data Mode bit

1 = AN52 is using Signed Data mode

0 = AN52 is using Unsigned Data mode

bit 7 DIFF51: AN51 Mode bit

1 = AN51 is using Differential mode

0 = AN51 is using Single-ended mode

bit 6 SIGN51: AN51 Signed Data Mode bit

1 = AN51 is using Signed Data mode

0 = AN51 is using Unsigned Data mode

bit 5 DIFF50: AN50 Mode bit

1 = AN50 is using Differential mode

0 = AN50 is using Single-ended mode

PIC32 Family Reference Manual

bit 4 SIGN50: AN50 Signed Data Mode bit

1 = AN50 is using Signed Data mode

0 = AN50 is using Unsigned Data mode

bit 3 DIFF49: AN49 Mode bit

1 = AN49 is using Differential mode

0 = AN49 is using Single-ended mode

bit 2 SIGN49: AN49 Signed Data Mode bit

1 = AN49 is using Signed Data mode

0 = AN49 is using Unsigned Data mode

bit 1 DIFF48: AN48 Mode bit

1 = AN48 is using Differential mode

0 = AN48 is using Single-ended mode

bit 0 SIGN48: AN48 Signed Data Mode bit

1 = AN48 is using Signed Data mode

0 = AN48 is using Unsigned Data mode

Section 22. 12-bit High-Speed SAR ADC

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

AGIEN31 AGIEN30 AGIEN29 AGIEN28 AGIEN27 AGIEN26 AGIEN25 AGIEN24

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

AGIEN23 AGIEN22 AGIEN21 AGIEN20 AGIEN19 AGIEN18 AGIEN17 AGIEN16

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

AGIEN15 AGIEN14 AGIEN13 AGIEN12 AGIEN11 AGIEN10 AGIEN9 AGIEN8

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

AGIEN7 AGIEN6 AGIEN5 AGIEN4 AGIEN3 AGIEN2 AGIEN1 AGIEN0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 AGIEN31:AGIEN0: ADC Interrupt Enable bits

1 = Interrupts are enabled for the selected analog input. The interrupt is generated after the converted

data is ready (indicated by the ARDYx bit (‘x’ = 31-0) of the ADCDSTAT1 register)

0 = Interrupts are disabled

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

AGIEN63 AGIEN62 AGIEN61 AGIEN60 AGIEN59 AGIEN58 AGIEN57 AGIEN56

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

AGIEN55 AGIEN54 AGIEN53 AGIEN52 AGIEN51 AGIEN50 AGIEN49 AGIEN48

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

AGIEN47 AGIEN46 AGIEN45 AGIEN44 AGIEN43 AGIEN42 AGIEN41 AGIEN40

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

AGIEN39 AGIEN38 AGIEN37 AGIEN36 AGIEN35 AGIEN34 AGIEN33 AGIEN32

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 AGIEN63:AGIEN32 ADC Interrupt Enable bits

1 = Interrupts are enabled for the selected analog input. The interrupt is generated after the converted

data is ready (indicated by the ARDYx bit (‘x’ = 63-32) of the ADCDSTAT2 register)

0 = Interrupts are disabled

PIC32 Family Reference Manual

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CSS31 CSS30 CSS29 CSS28 CSS27 CSS26 CSS25 CSS24

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CSS23 CSS22 CSS21 CSS20 CSS19 CSS18 CSS17 CSS16

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CSS15 CSS14 CSS13 CSS12 CSS11 CSS10 CSS9 CSS8

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CSS7 CSS6 CSS5 CSS4 CSS3 CSS2 CSS1 CSS0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 CSS31:CSS0: Analog Common Scan Select bits

1 = Select ANx for input scan

0 = Skip ANx for input scan

Note 1: In addition to setting the appropriate bits in this register, Class 1 and Class 2 analog inputs must select the

STRIG input as the trigger source if they are to be scanned through the CSS bits. Refer to the bit x

descriptions in the ADCTRGx register (Register 22-18) for selecting the STRIG option.

2: If a Class 1 or Class 2 input is included in the scan by setting the CSSx bit to ‘1’ and by setting the

TRGSRCx<4:0> bits to STRIG mode (‘0b11), the user application must ensure that no other triggers are

generated for that input using the RQCNVRT bit in the ADCCON3 register or the hardware input or any

digital filter. Otherwise, the scan behavior is unpredictable.

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CSS63 CSS62 CSS61 CSS60 CSS59 CSS58 CSS57 CSS56

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CSS55 CSS54 CSS53 CSS52 CSS51 CSS50 CSS49 CSS48

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CSS47 CSS46 CSS45 CSS44 CSS43 CSS42 CSS41 CSS40

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CSS39 CSS38 CSS37 CSS36 CSS35 CSS34 CSS33 CSS32

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 CSS63:CSS32: Analog Common Scan Select bits

1 = Select ANx for input scan

0 = Skip ANx for input scan

Note: Analog inputs 63 to 32 are always Class 3, as there are only 32 triggers available.

Section 22. 12-bit High-Speed SAR ADC

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

ARDY31 ARDY30 ARDY29 ARDY28 ARDY27 ARDY26 ARDY25 ARDY24

23:16

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

ARDY23 ARDY22 ARDY21 ARDY20 ARDY19 ARDY18 ARDY17 ARDY16

15:8

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

ARDY15 ARDY14 ARDY13 ARDY12 ARDY11 ARDY10 ARDY9 ARDY8

7:0

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

ARDY7 ARDY6 ARDY5 ARDY4 ARDY3 ARDY2 ARDY1 ARDY0

Legend: HS = Hardware Set HC = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 ARDY31:ARDY0: Conversion Data Ready for Corresponding Analog Input Ready bits

1 = This bit is set when converted data is ready in the data register

0 = This bit is cleared when the associated data register is read

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

ARDY63 ARDY62 ARDY61 ARDY60 ARDY59 ARDY58 ARDY57 ARDY56

23:16

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

ARDY55 ARDY54 ARDY53 ARDY52 ARDY51 ARDY50 ARDY49 ARDY48

15:8

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

ARDY47 ARDY46 ARDY45 ARDY44 ARDY43 ARDY42 ARDY41 ARDY40

7:0

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

ARDY39 ARDY38 ARDY37 ARDY36 ARDY35 ARDY34 ARDY33 ARDY32

Legend: HS = Hardware Set HC = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 ARDY63:ARDY32: Conversion Data Ready for Corresponding Analog Input Ready bits

1 = This bit is set when converted data is ready in the data register

0 = This bit is cleared when the associated data register is read

PIC32 Family Reference Manual

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CMPE31 CMPE30 CMPE29 CMPE28 CMPE27 CMPE26 CMPE25 CMPE24

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CMPE23 CMPE22 CMPE21 CMPE20 CMPE19 CMPE18 CMPE17 CMPE16

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CMPE15 CMPE14 CMPE13 CMPE12 CMPE11 CMPE10 CMPE9 CMPE8

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CMPE7 CMPE6 CMPE5 CMPE4 CMPE3 CMPE2 CMPE1 CMPE0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 CMPE31:CMPE0: ADC Digital Comparator ‘x’ Enable bits

These bits enable conversion results corresponding to the Analog Input to be processed by the Digital

Comparator. CMPE0 enables AN0, CMPE1 enables AN1, and so on.

Note 1: CMPEx = ANx, where ‘x’ = 0-31 (Digital Comparator inputs are limited to AN0 through AN31).

2: Changing the bits in this register while the Digital Comparator is enabled (ENDCMP = 1) can result in

unpredictable behavior.

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DCMPHI<15:8>

(1,2,3)

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DCMPHI<7:0>

(1,2,3)

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DCMPLO<15:8>

(1,2,3)

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DCMPLO<7:0>

(1,2,3)

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-16 DCMPHI<15:0>: Digital Comparator ‘x’ High Limit Value bits

(1,2,3)

These bits store the high limit value, which is used by digital comparator for comparisons with ADC

converted data.

bit 15-0 DCMPLO<15:0>: Digital Comparator ‘x’ Low Limit Value bits

(1,2,3)

These bits store the low limit value, which is used by digital comparator for comparisons with ADC

converted data.

Note 1: Changing theses bits while the Digital Comparator is enabled (E ) can result in unpredictable NDCMP = 1

behavior.

2: The format of the limit values should match the format of the ADC converted value in terms of sign and

fractional settings.

3: For Digital Comparator 1 used in CVD mode, the DCMPHI<15:0> and DCMPLO<15:0> bits must always

be specified in signed format, as the CVD output data is differential and is always signed.

Section 22. 12-bit High-Speed SAR ADC

through

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R-0, HS, HC

AFEN DATA16EN DFMODE OVRSAM<2:0> AFGIEN AFRDY

23:16

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — CHNLID<4:0>

15:8

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

FLTRDATA<15:8>

7:0

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

FLTRDATA<7:0>

Legend: HS = Hardware Set HC = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 AFEN: Digital Filter ‘x’ Enable bit

1 = Digital filter is enabled

0 = Digital filter is disabled and the AFRDY status bit is cleared

bit 30 DATA16EN: Filter Significant Data Length bit

1 = All 16 bits of the filter output data are significant

0 = Only the first 12 bits are significant, followed by four zeros

Note: This bit is significant only if DFMODE = 1 (Averaging Mode) and FRACT (ADCCON1<23>) = 1

(Fractional Output Mode).

bit 29 DFMODE: ADC Filter Mode bit

1 = Filter ‘x’ works in Averaging mode

0 = Filter ‘x’ works in Oversampling Filter mode (default)

When the ADC filter is enabled and DFMODE = 0:

Once an ADC edge conversion trigger event occurs, it is held active until the filter OVRSAM sample count

has expired.

The Minimum Trigger Period = (OVRSAM<2:0> bits in ADCFLTRx) (SAMC<7:0> bits in ADCxTIME T

((SELRES<1:0> bits in ADCxTIME + 1) T

Example:

• OVRSAM<2:0> bits in ADCFLTRx = 8x Samples

• SAMC<7:0> bits in ADCxTIME = 3 T

• SELRES<1:0> bits in ADCxTIME = 12 bits

User Min Trig period ≥ (8 * (3 T

+ 13 T

)) = 128 T

When the ADC filter is enabled and DFMODE = 1:

All ADC conversions are initiated solely by trigger events. After OVRSAM normal edge trigger events and

subsequent conversions, the ADC filter result will contain the average value of OVRSAM number of

conversions.

Refer to Figure 22-18: “ADC Filter Comparisons Example” for more information.

PIC32 Family Reference Manual

bit 28-26 OVRSAM<2:0>: Oversampling Filter Ratio bits

If DFMODE is ‘0’:

111 = 128 samples (shift sum 3 bits to right, output data is in 15.1 format)

110 = 32 samples (shift sum 2 bits to right, output data is in 14.1 format)

101 = 8 samples (shift sum 1 bit to right, output data is in 13.1 format)

100 = 2 samples (shift sum 0 bits to right, output data is in 12.1 format)

011 = 256 samples (shift sum 4 bits to right, output data is 16 bits)

010 = 64 samples (shift sum 3 bits to right, output data is 15 bits)

001 = 16 samples (shift sum 2 bits to right, output data is 14 bits)

000 = 4 samples (shift sum 1 bit to right, output data is 13 bits)

If DFMODE is ‘1’:

111 = 256 samples (256 samples to be averaged)

110 = 128 samples (128 samples to be averaged)

101 = 64 samples (64 samples to be averaged)

100 = 32 samples (32 samples to be averaged)

011 = 16 samples (16 samples to be averaged)

010 = 8 samples (8 samples to be averaged)

001 = 4 samples (4 samples to be averaged)

000 = 2 samples (2 samples to be averaged)

bit 25 AFGIEN: Digital Filter ‘x’ Interrupt Enable bit

1 = Digital filter interrupt is enabled and is generated by the AFRDY status bit

0 = Digital filter is disabled

bit 24 AFRDY: Digital Filter ‘x’ Data Ready Status bit

1 = Data is ready in the FLTRDATA<15:0> bits

0 = Data is not ready

Note: This bit is cleared by reading the FLTRDATA<15:0> bits or by disabling the Digital Filter module

(by setting AFEN to ‘0’).

bit 23-21 Unimplemented: Read as ‘0’

bit 20-16 CHNLID<4:0>: Digital Filter Analog Input Selection bits

These bits specify the analog input to be used as the oversampling filter data source.

11111 = AN31

•

00010 = AN2

00001 = AN1

00000 = AN0

Note: Only the first 32 analog inputs (Class 1 and Class 2) can use a digital filter.

bit 15-0 FLTRDATA<15:0>: Digital Filter ‘ ’ Data Output Value bitsx

The filter output data is as per the fractional format set in the FRACT bit (ADCCON1<23>). The FRACT bit

should not be changed while the filter is enabled. Changing the state of the FRACT bit after the operation

of the filter has ended will not update the value of the FLTRDATA<15:0> bits to reflect the new format.

through

(Continued)

Section 22. 12-bit High-Speed SAR ADC

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC3<4:0>

23:16

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC2<4:0>

15:8

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC1<4:0>

7:0

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC0<4:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-29 Unimplemented: Read as ‘0’

bit 28-24 TRGSRC3<4:0>: Trigger Source for Conversion of Analog Input AN3 Select bits

11111 00100 - = Refer to the “ADC” chapter in the specific device data sheet for trigger source selections

00011 = Scan Trigger (STRIG)

00010 = Global level software trigger (GLSWTRG)

00001 = Global software edge Trigger (GSWTRG)

00000 = No Trigger

For STRIG, in addition to setting the trigger, it also requires programming of the STRGSRC<4:0> bits

(ADCCON1<20:16>) to select the trigger source, and requires the appropriate CSSx bits to be set in the

ADCCSSx registers.

bit 23-21 Unimplemented: Read as ‘0’

bit 20-16 TRGSRC2<4:0>: Trigger Source for Conversion of Analog Input AN2 Select bits

See bits 28-24 for bit value definitions.

bit 15-13 Unimplemented: Read as ‘0’

bit 12-8 TRGSRC1<4:0>: Trigger Source for Conversion of Analog Input AN1 Select bits

See bits 28-24 for bit value definitions.

bit 7-5 Unimplemented: Read as ‘0’

bit 4-0 TRGSRC0<4:0>: Trigger Source for Conversion of Analog Input AN0 Select bits

See bits 28-24 for bit value definitions.

PIC32 Family Reference Manual

Bit

Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC7<4:0>

23:16

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC6<4:0>

15:8

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC5<4:0>

7:0

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC4<4:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-29 Unimplemented: Read as ‘0’

bit 28-24 TRGSRC7<4:0>: Trigger Source for Conversion of Analog Input AN7 Select bits

11111 00100 - = Refer to the “ADC” chapter in the specific device data sheet for trigger source selections

00011 = Scan Trigger (STRIG)

00010 = Global level software trigger (GLSWTRG)

00001 = Global software edge Trigger (GSWTRG)

00000 = No Trigger

For STRIG, in addition to setting the trigger, it also requires programming of the STRGSRC<4:0> bits

(ADCCON1<20:16>) to select the trigger source, and requires the appropriate CSSx bits to be set in the

ADCCSSx registers.

bit 23-21 Unimplemented: Read as ‘0’

bit 20-16 TRGSRC6<4:0>: Trigger Source for Conversion of Analog Input AN6 Select bits

See bits 28-24 for bit value definitions.

bit 15-13 Unimplemented: Read as ‘0’

bit 12-8 TRGSRC5<4:0>: Trigger Source for Conversion of Analog Input AN5 Select bits

See bits 28-24 for bit value definitions.

bit 7-5 Unimplemented: Read as ‘0’

bit 4-0 TRGSRC4<4:0>: Trigger Source for Conversion of Analog Input AN4 Select bits

See bits 28-24 for bit value definitions.

Section 22. 12-bit High-Speed SAR ADC

Bit

Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC11<4:0>

23:16

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC10<4:0>

15:8

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC9<4:0>

7:0

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC8<4:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-29 Unimplemented: Read as ‘0’

bit 28-24 TRGSRC11<4:0>: Trigger Source for Conversion of Analog Input AN11 Select bits

11111 00100 - = Refer to the “ADC” chapter in the specific device data sheet for trigger source selections

00011 = Scan Trigger (STRIG)

00010 = Global level software trigger (GLSWTRG)

00001 = Global software edge Trigger (GSWTRG)

00000 = No Trigger

For STRIG, in addition to setting the trigger, it also requires programming of the STRGSRC<4:0> bits

(ADCCON1<20:16>) to select the trigger source, and requires the appropriate CSSx bits to be set in the

ADCCSSx registers.

bit 23-21 Unimplemented: Read as ‘0’

bit 20-16 TRGSRC10<4:0>: Trigger Source for Conversion of Analog Input AN10 Select bits

See bits 28-24 for bit value definitions.

bit 15-13 Unimplemented: Read as ‘0’

bit 12-8 TRGSRC9<4:0>: Trigger Source for Conversion of Analog Input AN9 Select bits

See bits 28-24 for bit value definitions.

bit 7-5 Unimplemented: Read as ‘0’

bit 4-0 TRGSRC8<4:0>: Trigger Source for Conversion of Analog Input AN8 Select bits

See bits 28-24 for bit value definitions.

PIC32 Family Reference Manual

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC15<4:0>

23:16

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC14<4:0>

15:8

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC13<4:0>

7:0

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC12<4:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-29 Unimplemented: Read as ‘0’

bit 28-24 TRGSRC15<4:0>: Trigger Source for Conversion of Analog Input AN15 Select bits

11111 00100 - = Refer to the “ADC” chapter in the specific device data sheet for trigger source selections

00011 = Scan Trigger (STRIG)

00010 = Global level software trigger (GLSWTRG)

00001 = Global software edge Trigger (GSWTRG)

00000 = No Trigger

For STRIG, in addition to setting the trigger, it also requires programming of the STRGSRC<4:0> bits

(ADCCON1<20:16>) to select the trigger source, and requires the appropriate CSSx bits to be set in the

ADCCSSx registers.

bit 23-21 Unimplemented: Read as ‘0’

bit 20-16 TRGSRC14<4:0>: Trigger Source for Conversion of Analog Input AN14 Select bits

See bits 28-24 for bit value definitions.

bit 15-13 Unimplemented: Read as ‘0’

bit 12-8 TRGSRC13<4:0>: Trigger Source for Conversion of Analog Input AN13 Select bits

See bits 28-24 for bit value definitions.

bit 7-5 Unimplemented: Read as ‘0’

bit 4-0 TRGSRC12<4:0>: Trigger Source for Conversion of Analog Input AN12 Select bits

See bits 28-24 for bit value definitions.

Section 22. 12-bit High-Speed SAR ADC

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC19<4:0>

23:16

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC18<4:0>

15:8

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC17<4:0>

7:0

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC16<4:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-29 Unimplemented: Read as ‘0’

bit 28-24 TRGSRC19<4:0>: Trigger Source for Conversion of Analog Input AN19 Select bits

11111 00100 - = Refer to the “ADC” chapter in the specific device data sheet for trigger source selections

00011 = Scan Trigger (STRIG)

00010 = Global level software trigger (GLSWTRG)

00001 = Global software edge Trigger (GSWTRG)

00000 = No Trigger

For STRIG, in addition to setting the trigger, it also requires programming of the STRGSRC<4:0> bits

(ADCCON1<20:16>) to select the trigger source, and requires the appropriate CSSx bits to be set in the

ADCCSSx registers.

bit 23-21 Unimplemented: Read as ‘0’

bit 20-16 TRGSRC18<4:0>: Trigger Source for Conversion of Analog Input AN18 Select bits

See bits 28-24 for bit value definitions.

bit 15-13 Unimplemented: Read as ‘0’

bit 12-8 TRGSRC17<4:0>: Trigger Source for Conversion of Analog Input AN17 Select bits

See bits 28-24 for bit value definitions.

bit 7-5 Unimplemented: Read as ‘0’

bit 4-0 TRGSRC16<4:0>: Trigger Source for Conversion of Analog Input AN16 Select bits

See bits 28-24 for bit value definitions.

PIC32 Family Reference Manual

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC23<4:0>

23:16

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC22<4:0>

15:8

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC21<4:0>

7:0

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC20<4:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-29 Unimplemented: Read as ‘0’

bit 28-24 TRGSRC23<4:0>: Trigger Source for Conversion of Analog Input AN23 Select bits

11111-00100 = Refer to the “ADC” chapter in the specific device data sheet for information

00011 = Scan Trigger (STRIG)

00010 = Global level software trigger (GLSWTRG)

00001 = Global software edge Trigger (GSWTRG)

00000 = No Trigger

For STRIG, in addition to setting the trigger, it also requires programming of the STRGSRC<4:0> bits

(ADCCON1<20:16>) to select the trigger source, and requires the appropriate CSSx bits to be set in the

ADCCSSx registers.

bit 23-21 Unimplemented: Read as ‘0’

bit 20-16 TRGSRC22<4:0>: Trigger Source for Conversion of Analog Input AN22 Select bits

See bits 28-24 for bit value definitions.

bit 15-13 Unimplemented: Read as ‘0’

bit 12-8 TRGSRC21<4:0>: Trigger Source for Conversion of Analog Input AN21 Select bits

See bits 28-24 for bit value definitions.

bit 7-5 Unimplemented: Read as ‘0’

bit 4-0 TRGSRC20<4:0>: Trigger Source for Conversion of Analog Input AN20 Select bits

See bits 28-24 for bit value definitions.

Section 22. 12-bit High-Speed SAR ADC

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC27<4:0>

23:16

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC26<4:0>

15:8

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC25<4:0>

7:0

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC24<4:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-29 Unimplemented: Read as ‘0’

bit 28-24 TRGSRC27<4:0>: Trigger Source for Conversion of Analog Input AN27 Select bits

11111-00100 = Refer to the “ADC” chapter in the specific device data sheet for information

00011 = Scan Trigger (STRIG)

00010 = Global level software trigger (GLSWTRG)

00001 = Global software edge Trigger (GSWTRG)

00000 = No Trigger

For STRIG, in addition to setting the trigger, it also requires programming of the STRGSRC<4:0> bits

(ADCCON1<20:16>) to select the trigger source, and requires the appropriate CSSx bits to be set in the

ADCCSSx registers.

bit 23-21 Unimplemented: Read as ‘0’

bit 20-16 TRGSRC26<4:0>: Trigger Source for Conversion of Analog Input AN26 Select bits

See bits 28-24 for bit value definitions.

bit 15-13 Unimplemented: Read as ‘0’

bit 12-8 TRGSRC25<4:0>: Trigger Source for Conversion of Analog Input AN25 Select bits

See bits 28-24 for bit value definitions.

bit 7-5 Unimplemented: Read as ‘0’

bit 4-0 TRGSRC24<4:0>: Trigger Source for Conversion of Analog Input AN24 Select bits

See bits 28-24 for bit value definitions.

PIC32 Family Reference Manual

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC31<4:0>

23:16

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC30<4:0>

15:8

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC29<4:0>

7:0

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — TRGSRC28<4:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-29 Unimplemented: Read as ‘0’

bit 28-24 TRGSRC31<4:0>: Trigger Source for Conversion of Analog Input AN31 Select bits

11111-00100 = Refer to the “ADC” chapter in the specific device data sheet for information

00011 = Scan Trigger (STRIG)

00010 = Global level software trigger (GLSWTRG)

00001 = Global software edge Trigger (GSWTRG)

00000 = No Trigger

For STRIG, in addition to setting the trigger, it also requires programming of the STRGSRC<4:0> bits

(ADCCON1<20:16>) to select the trigger source, and requires the appropriate CSSx bits to be set in the

ADCCSSx registers.

bit 23-21 Unimplemented: Read as ‘0’

bit 20-16 TRGSRC30<4:0>: Trigger Source for Conversion of Analog Input AN30 Select bits

See bits 28-24 for bit value definitions.

bit 15-13 Unimplemented: Read as ‘0’

bit 12-8 TRGSRC29<4:0>: Trigger Source for Conversion of Analog Input AN29 Select bits

See bits 28-24 for bit value definitions.

bit 7-5 Unimplemented: Read as ‘0’

bit 4-0 TRGSRC28<4:0>: Trigger Source for Conversion of Analog Input AN28 Select bits

See bits 28-24 for bit value definitions.

Section 22. 12-bit High-Speed SAR ADC

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

CVDDATA<15:8>

23:16

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

CVDDATA<7:0>

15:8

U-0 U-0 R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

— — AINID<5:0>

7:0

R/W-0 R/W-0 R-0, HS, HC R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

ENDCMP DCMPGIEN DCMPED IEBTWN IEHIHI IEHILO IELOHI IELOLO

Legend: HS = Hardware Set HC = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-16 CVDDATA<15:0>: CVD Data Status bits

In CVD mode, these bits obtain the CVD differential output data (subtraction of CVD positive and negative

measurement), whenever a Digital Comparator event is generated. The value in these bits is compliant

with the FRACT bit (ADCCON1<23>) and is always signed.

bit 15-14 Unimplemented: Read as ‘0’

bit 13-8 AINID<5:0>: Digital Comparator 1 Analog Input Identification (ID) bits

When a digital comparator event occurs (DCMPED = 1), these bits identify the analog input being

monitored by Digital Comparator 1.

Note: In normal ADC mode, only analog inputs <31:0> can be processed by the Digital Comparator 1.

The Digital Comparator 1 also supports the CVD mode, in which Class 2 and Class 3 analog

inputs may be stored in the AINID<5:0> bits.

111111 = AN63 is being monitored

111110 = AN62 is being monitored

•

000001 = AN1 is being monitored

000000 = AN0 is being monitored

bit 7 ENDCMP: Digital Comparator 1 Enable bit

1 = Digital Comparator 1 is enabled

0 = Digital Comparator 1 is not enabled, and the DCMPED status bit (ADCCMPCON1<5>) is cleared

bit 6 DCMPGIEN: Digital Comparator 1 Interrupt Enable bit

1 = A Digital Comparator 1 interrupt is generated when the DCMPED status bit (ADCCMPCON1<5>) is set

0 = A Digital Comparator 1 interrupt is disabled

bit 5 DCMPED: Digital Comparator 1 “Output True” Event Status bit

The logical conditions under which the digital comparator gets “True” are defined by the IEBTWN, IEHIHI,

IEHILO, IELOHI, and IELOLO bits.

Note: This bit is cleared by reading the AINID<5:0> bits or by disabling the Digital Comparator module

(by setting ENDCMP to ‘0’).

1 = Digital Comparator 1 output true event has occurred (output of Comparator is ‘1’)

0 = Digital Comparator 1 output is false (output of comparator is ‘0’)

bit 4 IEBTWN: Between Low/High Digital Comparator 1 Event bit

1 = Generate a digital comparator event when DCMPLO<15:0>  DATA<31:0>

DCMPHI<15:0>

0 = Do not generate a digital comparator event

bit 3 IEHIHI: High/High Digital Comparator 1 Event bit

1 = Generate a Digital Comparator 1 Event when DCMPHI<15:0>  DATA<31:0>

0 = Do not generate an event

bit 2 IEHILO: High/Low Digital Comparator 1 Event bit

1 = Generate a Digital Comparator 1 Event when DATA<31:0>

DCMPHI<15:0>

0 = Do not generate an event

PIC32 Family Reference Manual

bit 1 IELOHI: Low/High Digital Comparator 1 Event bit

1 = Generate a Digital Comparator 1 Event when DCMPLO<15:0>  DATA<31:0>

0 = Do not generate an event

bit 0 IELOLO: Low/Low Digital Comparator 1 Event bit

1 = Generate a Digital Comparator 1 Event when DATA<31:0>

DCMPLO<15:0>

0 = Do not generate an event

Section 22. 12-bit High-Speed SAR ADC

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0

— — — — — — — —

23:16

U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0

— — — — — — — —

15:8

U-0 U-0 U-0 R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

— — — AINID<4:0>

7:0

R/W-0 R/W-0 R-0, HS, HC R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

ENDCMP DCMPGIEN DCMPED IEBTWN IEHIHI IEHILO IELOHI IELOLO

Legend: HS = Hardware Set HC = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-13 Unimplemented: Read as ‘0’

bit 12-8 AINID<4:0>: Digital Comparator ‘x’ Analog Input Identification (ID) bits

When a digital comparator event occurs (DCMPED = 1), these bits identify the analog input being

monitored by the Digital Comparator.

Note: Only analog inputs <31:0> can be processed by the Digital Comparator module ‘x’ (‘x’ = 2-6).

11111 = AN31 is being monitored

11110 = AN30 is being monitored

•

00001 = AN1 is being monitored

00000 = AN0 is being monitored

bit 7 ENDCMP: Digital Comparator ‘x’ Enable bit

1 = Digital Comparator ‘x’ is enabled

0 = Digital Comparator ‘x’ is not enabled, and the DCMPED status bit (ADCCMPCONx<5>) is cleared

bit 6 DCMPGIEN: Digital Comparator ‘x’ Interrupt Enable bit

1 = A Digital Comparator ‘x’ interrupt is generated when the DCMPED status bit (ADCCMPCONx<5>) is

set

0 = A Digital Comparator ‘x’ interrupt is disabled

bit 5 DCMPED: Digital Comparator ‘x’ “Output True” Event Status bit

The logical conditions under which the digital comparator gets “True” are defined by the IEBTWN, IEHIHI,

IEHILO, IELOHI and IELOLO bits.

Note: This bit is cleared by reading the AINID<5:0> bits (ADCCMPCON1<13:8>) or by disabling the

Digital Comparator module (by setting ENDCMP to ‘0’).

1 = Digital Comparator ‘x’ output true event has occurred (output of Comparator is ‘1’)

0 = Digital Comparator ‘x’ output is false (output of Comparator is ‘0’)

bit 4 IEBTWN: Between Low/High Digital Comparator ‘x’ Event bit

1 = Generate a digital comparator event when the DCMPLO<15:0> bits DATA<31:0> bits

DCMPHI<15:0> bits

0 = Do not generate a digital comparator event

bit 3 IEHIHI: High/High Digital Comparator ‘x’ Event bit

1 = Generate a Digital Comparator ‘x’ Event when the DCMPHI<15:0> bits  DATA<31:0> bits

0 = Do not generate an event

bit 2 IEHILO: High/Low Digital Comparator ‘x’ Event bit

1 = Generate a Digital Comparator ‘x’ Event when the DATA<31:0> bits

DCMPHI<15:0> bits

0 = Do not generate an event

PIC32 Family Reference Manual

bit 1 IELOHI: Low/High Digital Comparator ‘x’ Event bit

1 = Generate a Digital Comparator ‘x’ Event when the DCMPLO<15:0> bits  DATA<31:0> bits

0 = Do not generate an event

bit 0 IELOLO: Low/Low Digital Comparator ‘x’ Event bit

1 = Generate a Digital Comparator ‘x’ Event when the DATA<31:0> bits

DCMPLO<15:0> bits

0 = Do not generate an event

Section 22. 12-bit High-Speed SAR ADC

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

FEN ADC6EN ADC5EN ADC4EN ADC3EN ADC2EN ADC1EN ADC0EN

23:16

R/W-0 R-0, HS, HC R-0, HS, HC U-0 U-0 U-0 U-0 U-0

FIEN FRDY FWROVERR — — — — —

15:8

R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0

FCNT<7:0>

7:0

R-0 U-0 U-0 U-0 U-0 R-0 R-0 R-0

FSIGN — — — — ADCID<2:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 FEN: FIFO Enable bit

1 = FIFO is enabled

0 = FIFO is disabled; no data is being saved into the FIFO

bit 30-24 ADC6-ADC0 Enable bitsADC6EN:ADC0EN:

1 = Converted output data of ADC6-ADC0 is stored in the FIFO

0 = Converted output data of ADC6-ADC0 is not stored in the FIFO

Note: While using FIFO, the output data is additionally stored in the respective output data register

(ADCDATAx).

bit 23 FIEN: FIFO Interrupt Enable bit

1 = FIFO interrupts are enabled; an interrupt is generated once the FRDY bit is set

0 = FIFO interrupts are disabled

bit 22 FRDY: FIFO Data Ready Interrupt Status bit

1 = FIFO has data to be read

0 = No data is available in the FIFO

Note: This bit is cleared when the FIFO output data in ADCFIFO has been read and there is no

additional data ready in the FIFO (that is, the FIFO is empty).

bit 21 FWROVERR: FIFO Write Overflow Error Status bit

1 = A write overflow error in the FIFO has occurred (circular FIFO)

0 = A write overflow error in the FIFO has not occurred

Note: This bit is cleared after ADCFSTAT<23:16> are read by software.

bit 15-8 FCNT<7:0>: FIFO Data Entry Count Status bit

The value in these bits indicates the number of data entries in the FIFO.

bit 7 FSIGN: FIFO Sign Setting bit

This bit reflects the sign of data stored in the ADCFIFO register.

bit 6-3 Unimplemented: Read as ‘0’

bit 2-0 ADCID<2:0>: ADC6-ADC0 Identifier bits

These bits specify the ADC module whose data is stored in the FIFO.

111 = Reserved

110 = Converted data of ADC6 is stored in FIFO

•

000 = Converted data of ADC0 is stored in FIFO

PIC32 Family Reference Manual

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0

DATA<31:24>

23:16

R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0

DATA<23:16>

15:8

R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0

DATA<15:8>

7:0

R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0

DATA<7:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 DATA<31:0>: FIFO Data Output Value bits

Note: When an alternate input is used as the input source for a dedicated ADC module, the data output is still read

from the Primary input Data Output Register.

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0

— — — — — — — —

23:16

U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0

— — — — — — — —

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

ADCBASE<15:8>

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

ADCBASE<7:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 Unimplemented: Read as ‘0’

bit 15-0 ADCBASE<15:0>: ADC ISR Base Address bits

This register, when read, contains the base address of the user's ADC ISR jump table. The interrupt vector

address is determined by the IRQVS<2:0> bits of the ADCCON1 register specifying the amount of left

shift done to the ARDYx status bits in the ADCDSTAT1 and ADCDSTAT2 registers, prior to adding with

ADCBASE register.

Interrupt Vector Address = Read Value of ADCBASE = Value written to ADCBASE + x << IRQVS<2:0>,

where ‘x’ is the smallest active analog input ID from the ADCDSTAT1 or ADCDSTAT2 registers (which

has highest priority).

Section 22. 12-bit High-Speed SAR ADC

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0

DATA<31:24>

23:16

R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0

DATA<23:16>

15:8

R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0

DATA<15:8>

7:0

R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0

DATA<7:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 DATA<31:0>: ADC Converted Data Output bits.

Note 1: When an alternate input is used as the input source for a dedicated ADC module, the data output is still

read from the Primary input Data Output Register.

2: Reading the ADCDATAx register value after changing the FRACT bit converts the data into the format

specified by FRACT bit.

PIC32 Family Reference Manual

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DMAGEN RBFIEN6 RBFIEN5 RBFIEN4 RBFIEN3 RBFIEN2 RBFIEN1 RBFIEN0

23:16

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

DMAWROVERR RBF6 RBF5 RBF4 RBF3 RBF2 RBF1 RBF0

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DMACNTEN RAFIEN6 RAFIEN5 RAFIEN4 RAFIEN3 RAFIEN2 RAFIEN1 RAFIEN0

7:0

U-0 R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

— RAF6 RAF5 RAF4 RAF3 RAF2 RAF1 RAF0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 DMAGEN: DMA Global Enable bit

1 = DMA engine is enabled globally for all ADC modules. To use DMA, individual dedicated ADC modules

should enable their DMAEN bits (ADCxTIME<23>).

0 = DMA engine is globally disabled for all ADC modules

bit 30-24 RBFIEN6:RBFIEN0: RAM Buffer B Full Interrupt Enable bit

1 = Interrupts are enabled and generated when the RBFx Status bit is set

0 = Interrupts are disabled

bit 23 DMAWROVERR: DMA Write Overflow Error bit

1 = DMA write overflow error has occurred (circular buffer)

0 = DMA write overflow error has not occurred

Note: This bit is cleared by hardware after a software read of the ADCDMASTAT register.

bit 22-16 RBF6:RBF0: RAM Buffer B Full Status bit

1 = RAM Buffer B is full

0 = RAM Buffer B is not full

Note: These bits are self-clearing upon being a read by software.

bit 15 DMACNTEN: DMA Buffer Sample Count Enable bit

The DMA engine will save the current sample count for each buffer in the table starting at the ADCCNTB

address after each sample write into the corresponding buffer in the SRAM.

bit 14-8 RAFIEN6:RAFIEN0: RAM Buffer A Full Interrupt Enable bit

1 = Interrupts are enabled and generated when the RAFx status bit is set

0 = Interrupts are disabled

bit 7 Unimplemented: Read as ‘0’

bit 6-0 RAF6:RAF0: RAM Buffer A Full Status bit

1 = RAM Buffer A is full

0 = RAM Buffer A is not full

Note: These bits are self-clearing upon being a read by software.

Section 22. 12-bit High-Speed SAR ADC

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CNTBADDR<31:24>

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CNTBADDR<23:16>

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CNTBADDR<15:8>

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

CNTBADDR<7:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 CNTBADDR<31:0>: Analog-to-Digital Count Base Address bits

The ADCCNTB register contains the user-defined RAM address at which the DMA engine will start saving

the current count of output samples (if the DMACNTEN bit (ADCDMASTAT<15>) is set), which is already

written to each of the buffers in the System RAM for each ADC module. The ADCx module will have its

Buffer A current sample count saved at the address ((ADCCNTB) + 2 * x) and its Buffer B current sample

count saved at the address ((ADCCNTB) + (2 * x + 1)). Where 'x' is the dedicated ADC module ID.

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DMABADDR<31:24>

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DMABADDR<23:16>

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DMABADDR<15:8>

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DMABADDR<7:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 DMABADDR<31:0>: DMA Base Address bits

The ADCDMAB register contains the user-specified RAM address at which DMA engine will start saving

the converted data. The address of saving each data is specified by the following relations:

Buffer A starting address at: ADCDMAB + (2 * x) * 2

(ADCON1bits.DMABL + 1)

Buffer B starting at: ADCDMAB + (2 * (x + 1)) * 2

(ADCON1bits.DMABL + 1)

Where, 'x' is the dedicated ADC module ID.

PIC32 Family Reference Manual

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

LVL31 LVL30 LVL29 LVL28 LVL27 LVL26 LVL25 LVL24

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

LVL23 LVL22 LVL21 LVL20 LVL19 LVL18 LVL17 LVL16

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

LVL15 LVL14 LVL13 LVL12 LVL11 LVL10 LVL9 LVL8

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

LVL7 LVL6 LVL5 LVL4 LVL3 LVL2 LVL1 LVL0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31 LVL31:LVL0: Trigger Level and Edge Sensitivity bits

1 = Analog input is sensitive to the high level of its trigger (level sensitivity implies retriggering as long as

the trigger signal remains high)

0 = Analog input is sensitive to the positive edge of its trigger (this is the value after a reset)

Note 1: This register specifies the trigger level for analog inputs 0 to 31.

2: The higher analog input ID belongs to Class 3, and therefore, is only scan triggered. All Class 3 analog

inputs use the Scan Trigger, for which the level/edge is defined by the STRGLVL bit (ADCCON1<3>).

Section 22. 12-bit High-Speed SAR ADC

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-1 R/W-1

— — — ADCEIS<2:0> SELRES<1:0>

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

DMAEN ADCDIV<6:0>

15:8

U-0 U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0

— — — — — — SAMC<9:8>

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

SAMC<7:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-29 Unimplemented: Read as ‘0’

bit 28-26 ADCx Early Interrupt Select bitsADCEIS<2:0>:

111 = The data ready interrupt is generated 8 ADC clocks prior to the end of conversion

110 = The data ready interrupt is generated 7 ADC clocks prior to the end of conversion

•

001 = The data ready interrupt is generated 2 ADC clocks prior to the end of conversion

000 = The data ready interrupt is generated 1 ADC clock prior to the end of conversion

Note: All options are available when the selected resolution, specified by the SELRES<1:0> bits

(ADCxTIME<25:24>), is 12-bit or 10-bit. For a selected resolution of 8-bit, options from ‘000’

to ‘101’ are valid. For a selected resolution of 6-bit, options from ‘000’ to ‘011’ are valid.

bit 25-24 SELRES<1:0>: ADC Resolution Select bits

11 = 12 bits

10 = 10 bits

01 = 8 bits

00 = 6 bits

bit 23 DMAEN: DMA Enable bit

1 = DMA engine is enabled for the ADC module. The ADC can save data on system RAM.

0 = DMA engine is disabled for the ADC module. The converted data can only be retrieved from the

respective data register.

bit 22-16 ADCDIV<6:0>: ADC Clock Divisor bits

These bits divide the ADC control clock with period T

to generate the clock for ADC (T

1111111 = 254 * T

= T

•

0000011 = 6 * T

= T

0000010 = 4 * T

= T

0000001 = 2 * T

= T

0000000 = Reserved

bit 15-10 Unimplemented: Read as ‘0’

bit 9-0 SAMC<9:0>: ADC Sample Time bits

Where T

= period of the ADC conversion clock for the dedicated ADC controlled by the ADCDIV<6:0>

bits.

1111111111 = 1025 T

•

0000000001 = 3 T

0000000000 = 2 T

PIC32 Family Reference Manual

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

EIEN31 EIEN30 EIEN29 EIEN28 EIEN27 EIEN26 EIEN25 EIEN24

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

EIEN23 EIEN22 EIEN21 EIEN20 EIEN19 EIEN18 EIEN17 EIEN16

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

EIEN15 EIEN14 EIEN13 EIEN12 EIEN11 EIEN10 EIEN9 EIEN8

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

EIEN7 EIEN6 EIEN5 EIEN4 EIEN3 EIEN2 EIEN1 EIEN0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 EIEN31:EIEN0: Early Interrupt Enable for Analog Input bits

1 = Early Interrupts are enabled for the selected analog input. The interrupt is generated after the early

interrupt event occurs (indicated by the EIRDYx bit ('x' = 31-0) of the ADCEISTAT1 register)

0 = Interrupts are disabled

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

EIEN63 EIEN62 EIEN61 EIEN60 EIEN59 EIEN58 EIEN57 EIEN56

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

EIEN55 EIEN54 EIEN53 EIEN52 EIEN51 EIEN50 EIEN49 EIEN48

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

EIEN47 EIEN46 EIEN45 EIEN44 EIEN43 EIEN42 EIEN41 EIEN40

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

EIEN39 EIEN38 EIEN37 EIEN36 EIEN35 EIEN34 EIEN33 EIEN32

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 EIEN63:EIEN32: Early Interrupt Enable for Analog Input bits

1 = Early Interrupts are enabled for the selected analog input. The interrupt is generated after the early

interrupt event occurs (indicated by the EIRDYx bit ('x' = 63-32) of the ADCEISTAT2 register)

0 = Interrupts are disabled

Section 22. 12-bit High-Speed SAR ADC

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

EIRDY31 EIRDY30 EIRDY29 EIRDY28 EIRDY27 EIRDY26 EIRDY25 EIRDY24

23:16

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

EIRDY23 EIRDY22 EIRDY21 EIRDY20 EIRDY19 EIRDY18 EIRDY17 EIRDY16

15:8

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

EIRDY15 EIRDY14 EIRDY13 EIRDY12 EIRDY11 EIRDY10 EIRDY9 EIRDY8

7:0

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

EIRDY7 EIRDY6 EIRDY5 EIRDY4 EIRDY3 EIRDY2 EIRDY1 EIRDY0

Legend: HS = Hardware Set HC = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 EIRDY31:EIRDY0: Early Interrupt for Corresponding Analog Input Ready bits

1 = This bit is set when the early interrupt event occurs for the specified analog input. An interrupt will be

generated if early interrupts are enabled in the ADCEIEN1 register. For the Class 1 analog inputs, this

bit will set as per the configuration of the ADCEIS<2:0> bits in the ADCxTIME register. For the shared

ADC module, this bit will be set as per the configuration of the ADCEIS<2:0> bits in the ADCCON2

0 = Interrupts are disabled

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

EIRDY63 EIRDY62 EIRDY61 EIRDY60 EIRDY59 EIRDY58 EIRDY57 EIRDY56

23:16

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

EIRDY55 EIRDY54 EIRDY53 EIRDY52 EIRDY51 EIRDY50 EIRDY49 EIRDY48

15:8

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

EIRDY47 EIRDY46 EIRDY45 EIRDY44 EIRDY43 EIRDY42 EIRDY41 EIRDY40

7:0

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

EIRDY39 EIRDY38 EIRDY37 EIRDY36 EIRDY35 EIRDY34 EIRDY33 EIRDY32

Legend: HS = Hardware Set HC = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 EIRDY63:EIRDY32: Early Interrupt for Corresponding Analog Input Ready bits

1 = This bit is set when the early interrupt event occurs for the specified analog input. An interrupt will be

generated if early interrupts are enabled in the ADCEIEN2 register. For the Class 1 analog inputs, this

bit will set as per the configuration of the ADCEIS<2:0> bits in the ADCxTIME register. For the shared

ADC module, this bit will be set as per the configuration of the ADCEIS<2:0> bits in the ADCCON2

0 = Interrupts are disabled

PIC32 Family Reference Manual

Bit

Range

Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

U-0 U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0

— — — — WKUPCLKCNT<3:0>

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

WKIEN7

(1)

WKIEN6

(1)

WKIEN5

(1)

WKIEN4

(1)

WKIEN3

(1)

WKIEN2

(1)

WKIEN1

(1)

WKIEN0

(1)

15:8

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

WKRDY7

(1)

WKRDY6

(1)

WKRDY5

(1)

WKRDY4

(1)

WKRDY3

(1)

WKRDY2

(1)

WKRDY1

(1)

WKRDY0

(1)

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

ANEN7

(1)

ANEN6

(1)

ANEN5

(1)

ANEN4

(1)

ANEN3

(1)

ANEN2

(1)

ANEN1

(1)

ANEN0

(1)

Legend: HS = Hardware Set HC = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-28 Unimplemented: Read as ‘0’

bit 27-24 WKUPCLKCNT<3:0>: Wake-up Clock Count bits

These bits represent the number of ADC clocks required to warm-up the ADC module before it can perform

conversion. Although the clocks are specific to each ADC, the WKUPCLKCNT bit is common to all ADC

modules.

1111 = 2

= 32,768 clocks

•

0110 = 2

= 64 clocks

0101 = 2

= 32 clocks

0100 = 2

= 16 clocks

0011 = 2

= 16 clocks

0010 = 2

= 16 clocks

0001 = 2

= 16 clocks

0000 = 2

= 16 clocks

bit 23-16 WKIEN7:WKIEN0: ADC Wake-up Interrupt Enable bit

(1)

1 = Enable interrupt and generate interrupt when the WKRDYx status bit is set

0 = Disable interrupt

bit 15-8 WKRDY7:WKRDY0: ADC Wake-up Status bit

(1)

1 = ADC Analog and Bias circuitry ready after the wake-up count number 2

WKUPEXP

clocks after setting

ANENx to ‘1’

0 = ADC Analog and Bias circuitry is not ready

Note: These bits are cleared by hardware when the ANENx bit is cleared

bit 7-0 ANEN7:ANEN0: ADC Analog and Bias Circuitry Enable bits

(1)

1 = Analog and bias circuitry enabled. Once the analog and bias circuit is enabled, the ADC module needs

a warm-up time, as defined by the WKUPCLKCNT<3:0> bits.

0 = Analog and bias circuitry disabled

Note 1: Refer to the “ADC” chapter in the specific device data sheet to determine the available bits for your

device.

Section 22. 12-bit High-Speed SAR ADC

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

ADCCFG<31:24>

23:16

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

ADCCFG<23:16>

15:8

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

ADCCFG<15:8>

7:0

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

ADCCFG<7:0>

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 ADCCFG<31:0>: ADC Module Configuration Data bits

Note: These bits can only change when the applicable ANENx bit in the ADCANCON register is cleared.

PIC32 Family Reference Manual

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

AN<31:23>

23:16

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

AN<23:16>

15:8

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

AN<15:8>

7:0

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

AN<7:0>

Legend: HS = Hardware Set HC = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 AN<31:0>: ADC Analog Input bits

These bits reflect the system configuration and are updated during boot-up time. By reading these

read-only bits, the user application can determine whether or not an analog input in the device is available.

AN<31:0>: Reflects the presence or absence of the respective analog input (AN31-AN0).

Bit Range Bit

31/23/15/7

Bit

30/22/14/6

Bit

29/21/13/5

Bit

28/20/12/4

Bit

27/19/11/3

Bit

26/18/10/2

Bit

25/17/9/1

Bit

24/16/8/0

31:24

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

AN<63:56>

23:16

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

AN<55:48>

15:8

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

AN<47:40>

7:0

R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC R-0, HS, HC

AN<39:32>

Legend: HS = Hardware Set HC = Hardware Cleared

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 31-0 AN<63:32>: ADC Analog Input bits

These bits reflect the system configuration and are updated during boot-up time. By reading these

read-only bits, the user application can determine whether or not an analog input in the device is available.

AN<63:32>: Reflects the presence or absence of the respective analog input (AN63-AN32).

Section 22. 12-bit High-Speed SAR ADC

22.3 ADC OPERATION

The High-Speed Successive Approximation Register (SAR) ADC is designed to support power

conversion and motor control applications and consists of up to eight individual ADC modules.

The dedicated ADC modules have single analog inputs (after alternate selection) connected to

their S&H circuit. Since these ADC modules sample a dedicated analog input, they are termed

“dedicated” ADC modules. Dedicated ADC modules are used to measure/capture time sensitive

or transitory analog signals. The shared ADC module has multiple analog input connected to its

S&H circuit through a multiplexer. Since multiple analog input share this ADC, it is termed the

“shared” ADC module. The shared ADC module is used to measure analog signals of lower

frequencies and signals, which are static in nature (i.e.,do not change significantly with time).

The analog inputs that are connected to the dedicated ADC modules are considered Class 1

inputs. The analog inputs connected to the shared ADC module are Class 2 and Class 3 inputs.

The number of inputs designated for each “class” depends on the specific device. For example,

a device with eight ADC modules and 54 analog inputs will have the following arrangement:

• Class 1 = AN0 to AN6

• Class 2 = AN7 to AN31

• Class 3 = AN32 to AN53

The property of each class of analog input is described in Table 22-2:

Table 22-2: Analog Input Class

Class 1 analog input properties:

• Class 1 inputs are associated with a dedicated ADC module. Each dedicated ADC has a

single Class 1 input associated with it at a given time. The (alternate) input selection is

made through the SHxALT<1:0> bits in the ADCTRGMODE register. Regardless of the

alternate input selection, the trigger source and the result register remains the same.

• Each Class 1 input has a unique trigger (selected by the ADCTRGx register) and upon

arrival of the trigger, ends sampling and starts conversion. Upon completion of conversion,

the ADC module reverts back to sampling mode. When a Class 1 input is enabled and is

not being converted, it is always sampled.

• All Class 1 inputs have same priority, work independently and it is possible to start

conversion on all Class 1 inputs at the same time

• Class 1 inputs can be part of a scan list, triggered by the common scan trigger source.

Note: Refer to the “ADC” chapter in the specific device data sheet for the actual number

of analog inputs for each class.

ADC Module

Analog

Input

Class

Trigger Trigger Action

Dedicated ADC modules Class 1 Individual trigger source or

scan trigger

Ends sampling and starts

conversion

Shared ADC module Class 2 Individual trigger source or

scan trigger

Starts sampling sequence

or begins scan sequence

Shared ADC module with

input scan

Class 3 Scan trigger Starts scan sequence

PIC32 Family Reference Manual

Figure 22-4: Sample and Conversion Sequence for Dedicated ADC Modules

Class 2 and Class 3 analog input properties:

• Class 2 inputs are used on the shared ADC module, either individually triggered or as part of

a scan list. When used individually they are triggered by their unique trigger selected by the

ADCTRGx register.

• The analog inputs on the shared ADC have a natural order of priority (for example, AN7 has a

higher priority than AN12)

• Class 3 inputs are used exclusively for scanning and share a common trigger source (scan

trigger)

• Since Class 3 analog inputs share both the ADC module and the trigger source, the only

method possible to convert them is to scan them sequentially for each incoming scan trigger

event, where scanning occurs in the natural order of priority

• Unlike Class 1 analog inputs, the arrival of a trigger in the shared ADC module only starts the

sampling. When the trigger arrives, the ADC module goes into sampling mode for the

sampling time decided by the SAMC<9:0> bits (ADCCON2<25:16>). At the end of sampling,

the ADC starts conversion. Upon completion of conversion, the ADC module is used to con-

vert the next in line Class 2 or Class 3 inputs, according to the natural order of priority. When

a shared analog input (Class 2 or Class 3) has completed all conversion and no trigger is

pending, the ADC module is disconnected from all analog inputs.

Figure 22-5: Sample and Conversion Sequence for Shared ADC Modules

Sample Sample

Hold

Convert

Trigger switches the ADC core

(S&H) circuit to a Hold state

and the conversion begins

At the end of conversion, data

is written to buffer and interrupt

is generated (if enabled)

ADC core (S&H) is

disconnected from the analog

input during Hold

ADC core (S&H) is connected to the analog input for sampling.

(1 clock jitter)

Sample Hold

Convert

Once sampling is complete, the

conversion begins

At the end of conversion, data

is written to buffer and interrupt

is generated (if enabled)

ADC PRGXOH (S&H) is disconnected from the analog input

Disconnected Disconnected

Trigger causes S&H circuit to begin sampling for

the specified number of ADC clocks, and then

switches to theHold state.

Section 22. 12-bit High-Speed SAR ADC

22.3.1 Class 2 Triggering

When a single Class 2 input is triggered, it is sampled and converted by the shared S&H using

the sequence illustrated in Figure 22-5. When multiple Class 2 inputs are triggered, it is important

to understand the consequences of trigger timing. If a conversion is underway and another Class

2 trigger occurs then the sample-hold-conversion for the new trigger will be stalled until the

in-process sample-hold cycle is complete, as shown in the Figure 22-6.

Figure 22-6: Multiple Independent Class 2 Trigger Conversion Sequence

When multiple inputs to the shared S&H are triggered simultaneously, the processing order is

determined by their natural priority (the lowest numbered input has the highest priority). As an

example, if AN9, AN10, and AN11 are triggered simultaneously, AN9 will be sampled and

converted first, followed by AN10 and finally, AN11. When using the independent Class 2

triggering on the shared S&H, the SAMC<9:0> bits (ADCCON2<25:16>) determine the sample

time for all inputs while the appropriate TRGSRC<4:0> bits in the ADCTRGx Register (see

Sample ANHold AN

Convert AN

Once sampling is complete, the

conversion begins

ADC PRGXOH (S&H) is

disconnected from the

analog input

Disconnected Disconnected

Trigger for AN

Trigger for AN

AN is holding

and Sampling for

AN is delayed

Sample AN

Convert AN

Hold AN

ADC PRGXOH (S&H) is

disconnected from the

analog input

PIC32 Family Reference Manual

22.3.2 Input Scan

Input scanning is a feature that allows an automated scanning sequence of multiple Class 1,

Class 2 or Class 3 inputs. All Class 2 and Class 3 inputs are scanned using the single shared

S&H. Class 1 inputs are scanned using their dedicated S&H on the dedicated ADC module. The

selection of analog inputs for scanning is done with the CSSx bits of the ADCCSS1 and

ADCCSS2 registers. Class 1 and Class 2 inputs are triggered using STRIG selection in

ADCTRGx register and Class 3 inputs are triggered using the STRGSRC<4:0> of

ADCCON1<20:16> register. When a trigger occurs, all Class 1 inputs are captured

simultaneously and conversions are started simultaneously. For Class 2 or Class 3 inputs, the

sampling and conversion occur in the natural input order is used; lower number inputs are

sampled before higher number inputs.

Figure 22-7: Input Scan Conversion Sequence for Three Class 2 Inputs

When using the shared analog inputs in scan mode, the SAMC<9:0> bits in the ADC Control

Source Selection bits (STRGSRC<4:0>) in the ADC Control Register 1 (ADCCON1<20:16>),

determine the trigger source.

To ensure predicable results, a scan should not be retriggered until sampling of all inputs has

completed. Care should be taken in the system design to preclude retriggering a scan while a

scan is in progress.

Individual Class 2 triggers that occur during a scan will pre-empt the scan sequence if they are

a higher priority than the sample currently being processed. In , a scan of AN11, Figure 22-8

AN12, and AN13 is underway when an independent trigger of Class 2 input AN8 takes place.

The scan is interrupted for the sampling and conversion of AN8.

Figure 22-8: Scan Conversion Pre-empted by Class 2 Input Trigger

Sample AN Hold AN

Convert AN

Once sampling is complete, the

conversion begins

ADC PRGXOH (S&H) is disconnected from the analog input

Disconnected Disconnected

Trigger causes S&H circuit

to begin sampling first input

in the scan list for the

specified number of ADC

clocks, and then switches

to Hold state.

Once the first conversion is

complete, sampling begins

for next input in scan list

Sample AN Hold AN

Convert AN

Sample AN Hold AN

Convert AN

When each conversion is complete, the result is written to WKHADC

result buffer and an interrupt is generated

Sample AN11 Hold AN11

Convert AN11

ADC core (S&H) is disconnected from the analog input

Disconnected

Scan trigger starts scan

process of inputs AN11, AN12

and AN13

Independent trigger of

Class 2 input AN8

occurs here

Sample AN12 Hold AN12

Convert AN12

Sample AN6 Hold AN8

Convert AN8

Sample AN13 Hold AN13

Convert AN13

Sampling and conversion of AN8 pre-empts the scan

process. AN8 is sampled and converted between AN12

and AN13, but the arrival of the AN8 trigger does not

abort the ongoing sample/conversion of AN12.

Section 22. 12-bit High-Speed SAR ADC

22.4 ADC MODULE CONFIGURATION

Operation of the ADC module is directed through bit settings in the specific registers. The

following instructions summarize the actions and the settings. The options and details for each

configuration step are provided in the subsequent sections.

To configure the ADC module, perform the following steps:

1. Configure the analog port pins, as described in 22.4.1 “Configuring the Analog Port

Pins”.

2. Initialize the ADC calibration values by copying them from the factory-programmed

DEVADCx Flash registers into the corresponding ADCxCFG registers.

3. Select the analog inputs to the ADC multiplexers, as described in 22.4.2 “Selecting the

ADC Multiplexer Analog Inputs”.

4. Select the format of the ADC result, as described in 22.4.3 “Selecting the Format of the

ADC Result”.

5. Select the conversion trigger source, as described in 22.4.4 “Selecting the Conversion

Trigger Source”.

6. Select the voltage reference source, as described in 22.4.5 “Selecting the Voltage

Reference Source”.

7. Select the scanned inputs, as described in 22.4.6 “Selecting the Scanned Inputs”.

8. Select the analog-to-digital conversion clock source and prescaler, as described in

22.4.7 “Selecting the Analog-to-Digital Conversion Clock Source and Prescaler”.

9. Specify any additional acquisition time, if required, as described in 22.10 “ADC Sampling

Requirements”.

10. Turn on the ADC module, as described in Equation 22-2: “Sample Time for the Shared

ADC Module”.

11. Poll (or wait for the interrupt) for the voltage reference to be ready, as described in

22.4.5 “Selecting the Voltage Reference Source”.

12. Enable the analog and bias circuit for required ADC modules and after the ADC module

wakes-up, enable the digital circuit, as described in 22.7.3 “ADC Low-power Mode”

13. Configure the ADC interrupts (if required), as described in 22.6 “Interrupts”.

22.4.1 Configuring the Analog Port Pins

The ANSELx registers for the I/O ports associated with the analog inputs are used to configure

the corresponding pin as an analog or a digital pin. A pin is configured as analog input when the

corresponding ANSELx bit = 1. When the ANSELx bit = 0, the pin is set to digital control. The

ANSELx registers are set when the device comes out of Reset, causing the ADC input pins to be

configured as analog inputs by default.

The TRISx registers control the digital function of the port pins. The port pins that are required

as analog inputs must have their corresponding bit set in the specific TRISx register, configuring

the pin as an input. If the I/O pin associated with an ADC input is configured as an output by

clearing the TRISx bit, the port’s digital output level (V

or V

) will be converted. After a device

Reset, all of the TRISx bits are set. For more information on port pin configuration, refer to the

“I/O Ports” chapter of the specific device data sheet.

Note: When reading a PORT register that shares pins with the ADC, any pin configured

as an analog input reads as a ‘0’ when the PORT latch is read. Analog levels on any

pin that is defined as a digital input but not configured as an analog input, may cause

the input buffer to consume current that exceeds the device specification.

PIC32 Family Reference Manual

Example 22-1: Initializing and Using ADC Class 1 Input

int main(int argc, char** argv) {

int result[3];

/* initialize ADC calibration setting */

ADC0CFG = DEVADC0;

ADC1CFG = DEVADC1;

ADC2CFG = DEVADC2;

ADC3CFG = DEVADC3;

ADC4CFG = DEVADC4;

ADC5CFG = DEVADC5;

ADC7CFG = DEVADC7;

/* Configure ADCCON1 */

ADCCON1 = 0; // No ADCCON1 features are enabled including: Stop-in-Idle, turbo,

// CVD mode, Fractional mode and scan trigger source.

/* Configure ADCCON2 */

ADCCON2 = 0; // Since, we are using only the Class 1 inputs, no setting is

// required for ADCDIV

/* Initialize warm up time register */

ADCANCON = 0;

ADCANCONbits.WKUPCLKCNT = 5; // Wakeup exponent = 32 * TADx

/* Clock setting */

ADCCON3 = 0;

ADCCON3bits.ADCSEL = 0; // Select input clock source

ADCCON3bits.CONCLKDIV = 1; // Control clock frequency is half of input clock

ADCCON3bits.VREFSEL = 0; // Select AVDD and AVSS as reference source

/* Select ADC sample time and conversion clock */

ADC0TIMEbits.ADCDIV = 1; // ADC0 clock frequency is half of control clock = TAD0

ADC0TIMEbits.SAMC = 5; // ADC0 sampling time = 5 * TAD0

ADC0TIMEbits.SELRES = 3; // ADC0 resolution is 12 bits

ADC1TIMEbits.ADCDIV = 1; // ADC1 clock frequency is half of control clock = TAD1

ADC1TIMEbits.SAMC = 5; // ADC1 sampling time = 5 * TAD1

ADC1TIMEbits.SELRES = 3; // ADC1 resolution is 12 bits

ADC2TIMEbits.ADCDIV = 1; // ADC2 clock frequency is half of control clock = TAD2

ADC2TIMEbits.SAMC = 5; // ADC2 sampling time = 5 * TAD2

ADC2TIMEbits.SELRES = 3; // ADC2 resolution is 12 bits

/* Select analog input for ADC modules, no presync trigger, not sync sampling */

ADCTRGMODEbits.SH0ALT = 0; // ADC0 = AN0

ADCTRGMODEbits.SH1ALT = 0; // ADC1 = AN1

ADCTRGMODEbits.SH2ALT = 0; // ADC2 = AN2

/* Select ADC input mode */

ADCIMCON1bits.SIGN0 = 0; // unsigned data format

ADCIMCON1bits.DIFF0 = 0; // Single ended mode

ADCIMCON1bits.SIGN1 = 0; // unsigned data format

ADCIMCON1bits.DIFF1 = 0; // Single ended mode

ADCIMCON1bits.SIGN2 = 0; // unsigned data format

ADCIMCON1bits.DIFF2 = 0; // Single ended mode

/* Configure ADCGIRQENx */

ADCGIRQEN1 = 0; // No interrupts are used

ADCGIRQEN2 = 0;

/* Configure ADCCSSx */

ADCCSS1 = 0; // No scanning is used

ADCCSS2 = 0;

/* Configure ADCCMPCONx */

ADCCMPCON1 = 0; // No digital comparators are used. Setting the ADCCMPCONx

ADCCMPCON2 = 0; // register to '0' ensures that the comparator is disabled.

ADCCMPCON3 = 0; // Other registers are “don't care”.

ADCCMPCON4 = 0;

ADCCMPCON5 = 0;

ADCCMPCON6 = 0;

Section 22. 12-bit High-Speed SAR ADC

Example 22-1: Initializing and Using ADC Class 1 Input (Continued)

/* Configure ADCFLTRx */

ADCFLTR1 = 0; // No oversampling filters are used.

ADCFLTR2 = 0;

ADCFLTR3 = 0;

ADCFLTR4 = 0;

ADCFLTR5 = 0;

ADCFLTR6 = 0;

/* Set up the trigger sources */

ADCTRGSNSbits.LVL0 = 0; // Edge trigger

ADCTRGSNSbits.LVL1 = 0; // Edge trigger

ADCTRGSNSbits.LVL2 = 0; // Edge trigger

ADCTRG1bits.TRGSRC0 = 1; // Set AN0 to trigger from software.

ADCTRG1bits.TRGSRC1 = 1; // Set AN1 to trigger from software.

ADCTRG1bits.TRGSRC2 = 1; // Set AN2 to trigger from software.

/* Early interrupt */

ADCEIEN1 = 0; // No early interrupt

ADCEIEN2 = 0;

/* Turn the ADC on */

ADCCON1bits.ON = 1;

/* Wait for voltage reference to be stable */

while(!ADCCON2bits.BGVRRDY); // Wait until the reference voltage is ready

while(ADCCON2bits.REFFLT); // Wait if there is a fault with the reference voltage

/* Enable clock to analog circuit */

ADCANCONbits.ANEN0 = 1; // Enable the clock to analog bias

ADCANCONbits.ANEN1 = 1; // Enable the clock to analog bias

ADCANCONbits.ANEN2 = 1; // Enable the clock to analog bias

/* Wait for ADC to be ready */

while(!ADCANCONbits.WKRDY0); // Wait until ADC0 is ready

while(!ADCANCONbits.WKRDY1); // Wait until ADC1 is ready

while(!ADCANCONbits.WKRDY2); // Wait until ADC2 is ready

/* Enable the ADC module */

ADCCON3bits.DIGEN0 = 1; // Enable ADC0

ADCCON3bits.DIGEN1 = 1; // Enable ADC1

ADCCON3bits.DIGEN2 = 1; // Enable ADC2

while (1) {

/* Trigger a conversion */

ADCCON3bits.GSWTRG = 1;

/* Wait the conversions to complete */

while (ADCDSTAT1bits.ARDY0 == 0);

/* fetch the result */

result[0] = ADCDATA0;

while (ADCDSTAT1bits.ARDY1 == 0);

/* fetch the result */

result[1] = ADCDATA1;

while (ADCDSTAT1bits.ARDY2 == 0);

/* fetch the result */

result[2] = ADCDATA2;

* Process results here

* Note: Loop time determines the sampling time since all inputs are Class 1.

* If the loop time is small and the next trigger happens before the completion

* of set sample time, the conversion will happen only after the sample time

* has elapsed.

}

return (1);

}

PIC32 Family Reference Manual

22.4.2 Selecting the ADC Multiplexer Analog Inputs

Each ADC module has two inputs referred to as the positive and negative inputs. Input selection

options vary for the dedicated and shared ADC module are described in the following sections.

22.4.2.1 SELECTION OF POSITIVE INPUTS

For dedicated ADC modules, four alternate selection is provided for each positive input. This

alternate input can be chosen using the SHxALT<1:0> bits in the ADC Triggering Mode Register

(ADCTRGMODE) as follows:

• SH0ALT<1:0> (ADCTRGMODE<17:16>)

• SH1ALT<1:0> (ADCTRGMODE<19:18>)

• SH2ALT<1:0> (ADCTRGMODE<21:20>)

• SH3ALT<1:0> (ADCTRGMODE<23:22>)

• SH4ALT<1:0> (ADCTRGMODE<25:24>)

• SH5ALT<1:0> (ADCTRGMODE<27:26>)

• SH6ALT<1:0> (ADCTRGMODE<29:28>)

Refer to the device data sheet for possible alternate selection of ADC inputs.

For the shared ADC module, the positive input is shared among all Class 2 and Class 3 inputs.

Input connection of the analog input ANx to the shared ADC is automatic for either Class 2 input

trigger or during a scan of Class 2 and or Class 3 inputs. Selecting inputs for scanning is

discussed separately in 22.4.6 “Selecting the Scanned Inputs”.

22.4.2.2 SELECTION OF NEGATIVE INPUTS

Negative input selection is determined by the setting of the DIFFx bit of the ADCIMCONx register.

The DIFFx bit allows the inputs to be rail-to-rail, and either single-ended or differential. The

SIGNx and DIFFx bits in the ADCIMCONx registers scale the internal ADC analog inputs and

reference voltages and configure the digital result to align with the expected full-scale output

range.

For the shared ADC module, the analog inputs have individual settings for the DIFFx bit.

Therefore, the user has the ability to select certain inputs as single-ended and others as

differential, while being connected to the same shared ADC module. While sampling, the signal

will change on-the-fly as single-ended or differential, according to its corresponding DIFFx bit

setting.

Table 22-3: Negative Input Selection

ADCIMCON1 Input

Configuration Input Voltage Output

DIFFx SIGNx

1 1 Differential 2’s

complement

Minimum input V

P - V

N = -V

REF

-2048

Maximum input V

P - V

N = V

REF

+2047

1 0 Differential

unipolar

Minimum input V

P - V

N = -V

REF

Maximum input V

P - V

N = V

REF

+4095

0 1 Single-ended 2’s

complement

Minimum input V

P = V

REF

-2048

Maximum input V

P - V

N = V

REF

+2047

0 0 Single-ended

unipolar

Minimum input V

P = V

REF

Maximum input V

P - V

N = V

REF

+4095

Legend: V

P = Positive S&H input; V

N = Negative S&H input; V

REF

= V

REFH

- V

REFL

Note: For proper operation and to prevent device damage, input voltage levels should not

exceed the limits listed in the “Electrical Characteristics” chapter of the specific

device data sheet.

Section 22. 12-bit High-Speed SAR ADC

22.4.3 Selecting the Format of the ADC Result

The data in the ADC Result register can be read in any of the four supported data formats. The

user can select from unsigned integer, signed integer, unsigned fractional, or signed fractional.

Integer data is right-justified and fractional data is left-justified.

• The integer or fractional data format selection is specified globally for all analog inputs

using the Fractional Data Output Format bit, FRACT (ADCCON1<23>)

• The signed or unsigned data format selection can be independently specified for each

individual analog input using the SIGNx bits in the ADCIMCONx registers.

Table 22-4 provides how ADC result is formatted.

Table 22-4: ADC Result Format Results

FRACT SIGNx Description 32-bit Output Data Format

0 0 Unsigned integer

0000 0000 0000 0000

0000 dddd dddd dddd

0 1 Signed integer

ssss ssss ssss ssss

ssss sddd dddd dddd

1 0 Fractional

dddd dddd dddd 0000

0000 0000 0000 0000

1 1 Signed fractional

sddd dddd dddd dddd

0000 0000 0000 0000

PIC32 Family Reference Manual

Example 22-2: ADC Class 2 Configuration and Fractional Format

int main(int argc, char** argv) {

int result[3];

/* Configure ADCCON1 */

ADCCON1bits.FRACT = 1; // use Fractional output format

ADCCON1bits.SELRES = 3; // ADC7 resolution is 12 bits

ADCCON1bits.STRGSRC = 0; // No scan trigger.

/* Configure ADCCON2 */

ADCCON2bits.SAMC = 5; // ADC7 sampling time = 5 * TAD7

ADCCON2bits.ADCDIV = 1; // ADC7 clock freq is half of control clock = TAD7

/* Initialize warm up time register */

ADCANCON = 0;

ADCANCONbits.WKUPCLKCNT = 5; // Wakeup exponent = 32 * TADx

/* Clock setting */

ADCCON3 = 0;

ADCCON3bits.ADCSEL = 0; // Select input clock source

ADCCON3bits.CONCLKDIV = 1; // Control clock frequency is half of input clock

ADCCON3bits.VREFSEL = 0; // Select AVDD and AVSS as reference source

/* No selection for dedicated ADC modules, no presync trigger, not sync sampling */

ADCTRGMODEbits = 0;

/* Select ADC input mode */

ADCIMCON1bits.SIGN7 = 0; // unsigned data format

ADCIMCON1bits.DIFF7 = 0; // Single ended mode

ADCIMCON1bits.SIGN8 = 0; // unsigned data format

ADCIMCON1bits.DIFF8 = 0; // Single ended mode

ADCIMCON1bits.SIGN9 = 0; // unsigned data format

ADCIMCON1bits.DIFF9 = 0; // Single ended mode

/* Configure ADCGIRQENx */

ADCGIRQEN1 = 0; // No interrupts are used

ADCGIRQEN2 = 0;

/* Configure ADCCSSx */

ADCCSS1 = 0; // No scanning is used

ADCCSS2 = 0;

/* Configure ADCCMPCONx */

ADCCMPCON1 = 0; // No digital comparators are used. Setting the ADCCMPCONx

ADCCMPCON2 = 0; // register to '0' ensures that the comparator is disabled.

ADCCMPCON3 = 0; // Other registers are “don't care”.

ADCCMPCON4 = 0;

ADCCMPCON5 = 0;

ADCCMPCON6 = 0;

/* Configure ADCFLTRx */

ADCFLTR1 = 0; // No oversampling filters are used.

ADCFLTR2 = 0;

ADCFLTR3 = 0;

ADCFLTR4 = 0;

ADCFLTR5 = 0;

ADCFLTR6 = 0;

/* Set up the trigger sources */

ADCTRGSNSbits.LVL7 = 0; // Edge trigger

ADCTRGSNSbits.LVL8 = 0; // Edge trigger

ADCTRGSNSbits.LVL9 = 0; // Edge trigger

ADC1TRG2bits.TRGSRC7 = 1; // Set AN7 to trigger from software

ADC2TRG3bits.TRGSRC8 = 1; // Set AN8 to trigger from software

ADC2TRG3bits.TRGSRC9 = 1; // Set AN9 to trigger from software

Section 22. 12-bit High-Speed SAR ADC

Example 22-2: ADC Class 2 Configuration and Fractional Format (Continued)

/* Early interrupt */

ADCEIEN1 = 0; // No early interrupt

ADCEIEN2 = 0;

/* Turn the ADC on */

ADCCON1bits.ON = 1;

/* Wait for voltage reference to be stable */

while(!ADCCON2bits.BGVRRDY); // Wait until the reference voltage is ready

while(ADCCON2bits.REFFLT); // Wait if there is a fault with the reference voltage

/* Enable clock to analog circuit */

ADCANCONbits.ANEN7 = 1; // Enable the clock to analog bias

/* Wait for ADC to be ready */

while(!ADCANCONbits.WKRDY7); // Wait until ADC7 is ready

/* Enable the ADC module */

ADCCON3bits.DIGEN7 = 1; // Enable ADC7

while (1) {

/* Trigger a conversion */

ADCCON3bits.GSWTRG = 1;

/* Wait the conversions to complete */

while (ADCDSTAT1bits.ARDY7 == 0);

/* fetch the result */

result[0] = ADCDATA7;

while (ADCDSTAT1bits.ARDY8 == 0);

/* fetch the result */

result[1] = ADCDATA8;

while (ADCDSTAT1bits.ARDY9 == 0);

/* fetch the result */

result[2] = ADCDATA9;

* Process results here

* Note 1: Loop time determines the sampling time since all inputs are Class 2.

* If the loop time happens is small and the next trigger happens before the

* completion of set sample time, the conversion will happen only after the

* sample time has elapsed.

* Note 2: Results are in fractional format

}

return (1);

}

PIC32 Family Reference Manual

22.4.4 Selecting the Conversion Trigger Source

Class 1 and Class 2 inputs to the ADC module can be triggered for conversion either individually,

or as part of a scan sequence. Class 3 inputs can only be triggered as part of a scan sequence.

Individual or scan triggers can originate from an on-board timer or output compare peripheral

event, from external digital circuits connected to INT0, from external analog circuits connected to

an analog comparator, or through software by setting a trigger bit in a SFR.

22.4.4.1 TRIGGER SELECTION FOR CLASS 1 AND CLASS 2 INPUTS

For each one of the Class 1 and Class 2 inputs, the user application can independently specify

a conversion trigger source. The individual trigger source for an analog input ‘x’ is specified by

the TRGSRC<4:0> bits located in registers ADCTRG1 through ADCTRG8. Refer to the “ADC”

chapter of the specific device data sheet for more information on the available conversion trigger

options. For example, these trigger sources may include:

• General Purpose (GP) Timers: When a period match occurs for the 32-bit timer, Timer3/2

or Timer5/4, or the 16-bit Timer1, Timer3 or Timer5, a special ADC trigger event signal is

generated by the timer. This feature does not exist for other timers. For more information,

refer to Section 14. “Timers” (DS60001105) and the “Timer” chapters in the specific

device data sheet.

• Output Compare: The Output Compare peripherals, OC1, OC3, and OC5, can be used to

generate an ADC trigger then the output transitions from a low to high state. For more

information, refer to Section 16. “Output Compare” (DS60001111), and the “Output

Compare” chapter in the specific device data sheet.

• Comparators: The analog Comparators can be used to generate an ADC trigger when the

output transitions from a low state to a high state. For more information, refer to Section

19. “Comparator” (DS60001110), and the “Comparator” chapter in the specific device

data sheet.

• External INT0 Pin Trigger: In this mode, the ADC module starts a conversion on an active

transition on the INT0 pin. The INT0 pin may be programmed for either a rising edge input

or a falling edge input to trigger the conversion process.

• Global Software Trigger: The ADC module can be configured for manually triggering a con-

version for all inputs that have selected this trigger option. The user can manually trigger a

conversion by setting the Global Software Trigger bit, GSWTRG (ADCCON3<6>).

22.4.4.2 PRESYNCHRONIZED TRIGGER AND ASYNCHRONOUS SAMPLING

FOR CLASS 1 ANALOG INPUTS

The ADCTRGx register is used for ADC triggers.

• Converted data can be stored in dedicated output registers (ADCDATAx)

• Converted data can be stored in the FIFO

• Converted data can be stored in system RAM using the DMA engine

The ADCTRGMODE register contains the trigger mode for the ADC module determined by the

STRGEN bit (presynchronized trigger enable) and the SSAMPEN bit (synchronous sampling

also for the first sample after being idle or disabled).

Note: When conversion triggers for multiple Class 2 analog inputs occur simultaneously,

they are prioritized according to a natural order priority scheme based on the analog

input used. AN7 has the highest priority, AN8 has the next highest priority, etc.

Note 1: The trigger and synchronization works on “control clock (T

)”. But the sampling

time (t

SAMC

x) is based on T

clock (which is derived from the T

signal after pass-

ing through a divisor).

2: When Synchronous sampling is used (SSAMPEN = 1), the presynchronized trigger

value is ignored (STRGEN = “don’t care”).

Section 22. 12-bit High-Speed SAR ADC

22.4.4.2.1 Synchronous Sampling (SSAMPEN =

) 

After a trigger event, sampling ends and conversion starts exactly (2 * T

+ t

SAMC

x) after

presynchronized trigger or t

SAMC

after the previous conversion, where t

SAMC

x is the sample time

set by the SAMC<9:0> (ADCxTIME<9:0>) bits.

22.4.4.2.2 Asynchronous Sampling (SSAMPEN =

) 

After a trigger event, sampling ends and conversion starts immediately (with or without

presynchronized), provided that (2 * T

+ t

SAMC

x) after pre-synchronized trigger or t

SAMC

x after

previous conversion, is met and already completed (elapsed). If the time is not met, then the

sampling will go on for t

SAMC

x time and only then conversion starts. Effectively, this becomes a

synchronous sampling, but only when the t

SAMC

x requirement is not met before the last

asynchronous trigger. If the t

SAMC

x requirement is met before the last asynchronous trigger, in

fact the last trigger will issue an asynchronous end-of-sampling. It is only the start-of-conversion

which is always synchronous. The variable delay between the asynchronous end-of-sampling

and the next clock-positive edge-aligned start-of-conversion is bridged by the sampling capacitor

which holds the analog voltage value unchanged until it can be converted by the synchronous

ADC.

Table 22-5: Class 1 ADC Triggering

Figure 22-9 graphically explains the various cases for the STRGEN and SSAMPEN bits. Any

trigger is asynchronous by nature and similarly, the trigger for ADC module being asynchronous

can arrive any time, with reference to a single T

clock. This is depicted by “(1 period jitter)”.

Once the trigger is received, the “presynchronized trigger” occurs 1 T

clock after the actual

trigger. Please note that the presynchronized trigger is an internal signal.

Considering the case when both STRGENx and SSAMPENx are ‘0’ (no presynchronized trigger

and asynchronous sampling), the asynchronous trigger causes the ADC to switch from Sample

mode to Conversion mode. In other words, in such a situation, the presynchronized trigger is

ignored (i.e., not used). This is true only if the sample time (t

SAMC

x) is met.

Considering the next case, when STRGENx = 1 and SSAMPENx = 0 (presynchronized trigger

and asynchronous sampling), the presynchronized trigger is the signal that causes the ADC to

switch from Sample mode to Conversion mode. This condition is true only if the sample time

SAMC

x) is met.

For both conditions previously mentioned STRGENx, SSAMPENx = 00 and STRGENx,

SSAMPENx = 10), the explained behaviors are true if sample time (t

SAMC

x) is met. In a case of

a repeated trigger and when sample time (t

SAMC

x) is met, the explained behavior is graphically

depicted in Figure 22-10. The figure shows that the second trigger occurs after the t

SAMC

x time

is elapsed. Therefore, the second trigger causes the ADC to switch from Sample mode to

Convert mode. Please note that, the trigger (first or second trigger) is an asynchronous trigger or

a presynchronized trigger, based on the setting of STRGENx, SSAMPENx as ‘00’ or ‘10’.

In case where the t

SAMC

x time is not met, the trigger (whether asynchronous or presynchronized)

would not cause the switch from sample to convert. Instead, the ADC will wait for t

SAMC

x time

before switching from sample to convert mode. This is depicted in Figure 22-11. In the figure, the

second trigger occurs well before the t

SAMC

x time is elapsed. Therefore, this trigger does not

cause a start of conversion. Instead, the sample-to-conversion happens only after the t

SAMC

time is complete. In other words, even while setting the ADC to Asynchronous Sampling mode

(SSAMPEN = 0), the behavior of the ADC will be synchronous if the sample time (t

SAMC

x) is not

met between each trigger.

Returning to Figure 22-9 and considering the case when STRGENx = x and SSAMPENx = 1

(synchronous sampling), the ADC switches from sample to conversion (2 * T

+ t

SAMC

x) after the

presynchronized trigger.

STRGEN SSAMPEN Description

0 0 No presynchronized trigger and asynchronous sampling.

1 0 Presynchronized trigger and asynchronous sampling.

x 1 Synchronous sampling.

PIC32 Family Reference Manual

Figure 22-9: Presynchronized Trigger (STRGEN bit) and Synchronized Sampling (SSAMPEN bit)

Control Clock (TQ)

Trigger (1 period jitter)

Presynchronized Trigger

Sample

ends

‘00’: STRGENx = 0, SSAMPENx = 0

W6$0&[

ADCxTIME<9:0>

2 * TQ

‘10’: STRGENx = 1, SSAMPENx = 0

Sample ends,

Conversion starts

tSAMCx already completed in past

Conversion

starts

7RWDO6DPSOH7LPH Sample ends,

Conversion starts

µ[¶675*(1[  RU 66$03(1[   

Section 22. 12-bit High-Speed SAR ADC

Figure 22-10: Asynchronous Sampling (SSAMPEN = 0) (When trigger is at rate such that t

SAMC

x is met, the

ADC allows asynchronous trigger to start conversion)

Trigger

Sample

Convert

SAMCx

CONVERT

First Trigger

Second Trigger

occurred after t

SAMCx

1 T

jitter1 T

jitter

PIC32 Family Reference Manual

Figure 22-11: Asynchronous Sampling (SSAMPEN = 0) (When trigger is too fast (before t

SAMC

x is complete),

the ADC enforces minimum sampling time (t

SAMC

x) and defaults to synchronous sampling)

Class 1 inputs are usually meant to convert analog signals that are fast and transitory in nature.

In addition, multiple Class 1 inputs would be required to convert different analog signals that are

in phase relation to each other. Examples of such a signal would be 3-phase current signals of a

motor.

Considering a case when ADC0, ADC1, and ADC2 are used to sample 3-phase current and all

of the ADC modules use STRGENx, SSAMPENx = 00 (no presynchronized trigger and

asynchronous sampling), the individual trigger for ADC occurs at slightly different times (due to

propagation delay of trigger signal). This is depicted in Figure 22-12. This difference in trigger

causes a phase error in the sampled analog signal. To avoid such errors, the presynchronized

trigger and asynchronous sampling should be used (i.e., STRGENx, SSAMPENx = 10). The

usage of a presynchronized trigger will ensure that all of the ADC modules receive the trigger at

exactly the same time.

Trigger

Sample

Convert

tSAMCx

tCONVERT

First Trigger

Second Trigger occurred

before tSAMCx

1 TQjitter

Section 22. 12-bit High-Speed SAR ADC

Figure 22-12: Presynchronized Trigger Waveform (When multiple Class 1 inputs are used to convert phase

currents of a 3-phase motor)

Since the trigger and synchronization works with the control clock (T

) and the ADC modules

work on their own clock (T

), proper synchronization should be maintained between the two

clock domains. For proper synchronization, two bits are provided, FSSCLKEN (ADCCON1<10>

and FSPBCLKEN (ADCCON1<9>). The usage of these bits are as follows:

• Set the FSSCLKEN bit if one of the following conditions is true:

- ADCSEL<1:0> = (SYSCLK)

- ADCSEL<1:0> = (REFCLK3) and the REFCLK3 is also a divided clock derived from

the system clock (SYSCLK)

- ADCSEL<1:0> = (FRC) and the system clock is also set to be driven by FRC

- ADCSEL<1:0> = PBCLK (for PIC32MZ family)/SYSCLK (for PIC32MK family) and the

PBCLK (for PIC32MZ family) clock is a divided clock derived from the system clock

• Set the FSPBCLKEN bit if one of the following conditions is true:

- ADCSEL<1:0> = SYSCLK and the peripheral clock is a divided clock from the system

clock and the ADC is not faster than the peripheral clock. This means that both the

peripheral clock and the ADC clock are divided from the same system clock, but the

division ratio of the ADC clock is higher than or equal to the division ratio of the periph-

eral clock, which makes the peripheral clock synchronous to, but not slower than the

ADC clock.

- ADCSEL<1:0> = REFCLK3 and REFCLK3 is synchronous to, and slower than the

peripheral clock, which is true if the peripheral clock is also derived from the

REFCLK3, but is not slower than the ADC clock

- ADCSEL<1:0> = FRC and the peripheral clock is also divided from the FRC and is not

slower than the ADC clock

- ADCSEL<1:0> = PBCLK (for PIC32MZ family/SYSCLK (for PIC32MK family)

Control Clock (TQ)

Trigger (1 period jitter)

Although ADC1, ADC2, and ADC3 use the common

trigger, due to propagation delay, the “end of sampling

and start of conversion” does not occur at the exact

same time.

‘00’: STRGEN0 0=0, SSAMPEN = 0

‘00’: STRGEN1 1=0, SSAMPEN = 0

‘00’: STRGEN2 2=0, SSAMPEN = 0

ADC0

ADC1

ADC2

PIC32 Family Reference Manual

22.4.4.3 CONVERSION TRIGGER SOURCES AND CONTROL

The following are the possible sources for each trigger signal:

• External trigger selection through the TRGSRCx<4:0> bits in the ADCTRGx registers. This

capability is supported only for class 1 and class 2 analog inputs. Typically, the user

specifies a particular trigger source to initiate a conversion for specific input.

All of the analog inputs may select the same trigger source if desired. In such an event, the

result will resemble a “scanned conversion”, which will have its order of completion enforced

by the priority of the inputs associated with the same trigger source. The first trigger selec-

tion is ‘00000’ (no trigger), which amounts to temporarily disabling that particular trigger and

consequently, temporarily disabling that analog input from being converted. The next two

selections for trigger source (GSWTRG and GLSWTRG) are software generated trigger

sources. The second software generated trigger selection is the Global Software Trigger

(GSWTRG). This trigger links to the GSWTRG bit in the ADCCON3 register, which may be

used to enable the user application to initiate a single conversion. Since GSWTRG is a

self-clearing bit, it clears itself on the next ADC clock cycle after being set by the user appli-

cation. The third software generated trigger selection is the Global Level Software Trigger

(GLSWTRG), which is linked to the GLSWTRG bit in the ADCCON3 register. This trigger

may be used by the user application to initiate a burst of consecutive samples, as the

GLSWTRG bit is not self-clearing. The fourth trigger selection is a special selection, the

Scan Trigger selection, which allows the Class 1 and Class 2 analog inputs to be included

as members of a global scan of all inputs. The remaining trigger selections 5 to 31 are device

dependent. Refer to the specific device data sheet for more information.

• Scanned trigger selection via the STRGSRC<4:0> bits in the ADCCON1 register and

select bits in the ADCCSSx registers. This mode is typically used to initiate the conversion

of a group of analog inputs. This capability works for Class 1, 2, and 3 analog inputs, but is

typically used for Class 3 inputs because they do not have individual associated TRGSRC

bits. One of the trigger selections is the GSWTRG bit in the ADCCON3 register, which may

be used to enable the user software to initiate a conversion.

• User initiated trigger via the ADINSEL<5:0> bits and the RQCNVRT bit in the ADCCON3

request for a specified analog input. Using this mode enables the user application to trigger

the conversion of an input without changing the trigger source configuration of the ADC.

This is useful in handling error situations where another software module wants ADC infor-

mation without disrupting the normal operation of the ADC. This is also the preferred

method to generate the initial trigger to start an digital filter sequence.

• User controlled sampling of Class 2 and Class 3 inputs through the ADINSEL<5:0> bits and

the SAMP bit in the ADCCON3 register. Setting the SAMP bit causes the Class 2 and

Class 3 inputs to be in Sampling mode, while ignoring the selection of the SAMC<9:0> bits.

This mode is also useful in software conversion of ADC with software selectable sample

time.

• External module (such as PTG) may specify an analog input for conversion through the

setting of ECRIEN bit in the ADCCON2 register. This method operates independently of the

normal TRGSRC and STRGSRC methods. External modules may still use individual

trigger signals and initiate conversions through the normal TRGSRC and STRGSRC meth-

ods.

Section 22. 12-bit High-Speed SAR ADC

22.4.4.4 USER-REQUESTED INDIVIDUAL CONVERSION TRIGGER

(SOFTWARE ADC CONVERSION) (ONLY FOR CLASS 2 AND CLASS 3

INPUTS)

The user can explicitly request a single conversion (by software) of any selected analog input at

any time during program execution, without changing the trigger source configuration of the

ADC. The steps to be followed for conversion are as follows:

• The analog input ID to be converted is specified by the ADC Input Select bits,

ADINSEL<5:0> (ADCCON3<5:0>).

• The sampling of analog input is started by setting the SAMP bit (ADCCON3<9>)

• After the required sampling time (time delay), the SAMP bit is cleared

• The conversion of sampled signal is started by setting the RQCNVRT bit (ADCCON3<8>)

• Once the conversion is complete, the ARDYx bit of the ADCDSTATx register will be set.

The data can be read from the ADCDATAx register.

Figure 22-13 illustrates the conversion process in graphical form:.

Figure 22-13: Individual Conversion Trigger Process

SAMP (AD1CON3<9>)

Hold AN8

Convert AN8

Select AN8ADINSEL<5:0>

(AD1CON3<5:0>)

Sample AN8

Disconnected

RQCNVRT (AD1CON3<8>)

SAMP bit is first cleared before the

RQCNVRT bit is set

Automatically cleared in next clock TQ

Converted data stored in buffer

Select AN10

Hold AN10Sample AN10

Convert AN10

Converted data stored in buffer

Disconnected

PIC32 Family Reference Manual

22.4.5 Selecting the Voltage Reference Source

The user application can select the voltage reference for the ADC module, which can be internal

or external. The Voltage Reference Input Selection bits, VREFSEL<2:0> (ADCCON3<15:13>),

select the voltage reference for analog-to-digital conversions. The upper voltage reference

REFH

) and the lower voltage reference (V

REFL

) may be the internal AV

and AV

voltage rails

or the band gap reference generator or the external V

REF

+ and V

REF

- input pins. When the

voltage reference and band gap reference are ready, the BGVRRDY (ADCCON2<31>) bit is set.

If a Fault occurs in the voltage reference (such as a brown-out), the REFFLT bit

(ADCCON2<30>) is set. The BGVRRDY and REFFLT bits can also generate interrupts if the

BGVRIEN bit (ADCCON2<15>) and REFFLTIEN bit (ADCCON2<14>) are set, respectively.

The voltages applied to the external reference pins must comply with certain specifications. Refer

to the “Electrical Characteristics” chapter in the specific device data sheet for the electrical

specifications.

The Analog Input Charge Pump Enable bit, AICPMPEN (ADCCON1<12>), should be set when

the difference between the selected reference voltages (V

REFH

- V

REFL

) is less than 0.65 * (AV

- AV

). Setting this bit does not increase the magnitude of reference voltage; however, setting

this bit reduces the series source resistance to the sampling capacitors. This maximizes the SNR

for analog-to-digital conversions using small reference voltage rails.

22.4.6 Selecting the Scanned Inputs

All available analog inputs can be configured for scanning. Class 1 inputs are sampled using their

dedicated ADC module. Class 2 and Class 3 inputs are sampled using the shared ADC module.

A single conversion trigger source is selected for all of the inputs selected for scanning using the

STRGSRC<4:0> bits (ADCCON1<20:16>). On each conversion trigger, the ADC module starts

converting in the natural priority all inputs specified in the user-specified scan list (ADCCSS1 or

ADCCSS2). For Class 1 inputs, sampling ends at the time of the trigger and conversion for all of

them begin in parallel. For Class 2 and Class 3 inputs, the trigger initiates a sequential

sample/conversion process in the natural priority order.

An analog input belongs to the scan if it is:

• A Class 3 input. For Class 3 inputs, scan is the only mechanism for conversion.

• A Class 1 or a Class 2 input, which has the scan trigger selected as the trigger source, by

selecting the STRIG option in the TRGSRCx<4:0> bits located in the ADCTRG1 through

ADCTRG8 registers.

The trigger options available for scan are identical to those available for independent triggering

of Class 1 and Class 2 inputs. Any Class 1 or Class 2 inputs that are part of the scan must have

the STRIG option selected as their trigger source in the TRGSRCx<4:0> bits.

Note 1: The external V

REF

+ and V

REF

- pins can be shared with other analog peripherals.

Refer to the “Pin Tables” section of the specific device data sheet for more

information. In addition, the ANSELx bits for the V

REF

+ and V

REF

- pins must be set

to Analog mode.

2: The Band Gap reference source is not available on all devices. Please refer to the

specific device data sheet to determine availability of this feature.

Note 1: Since the clock divisor, resolution and sampling time for each dedicated ADC

module (SELRES, ADCDIV, and SAMC<9:0> bits in the ADCxTIME register),

and the shared ADC module (SELRES in the ADCCON1 register, ADCDIV and

SAMC<9:0> bits in the ADCCON2 register) are handled through separate

registers, if a scan sequence is to be set involving both dedicated and shared

inputs, each of these registers must be initialized individually, even in scan

mode.

2: The end-of-scan (EOS) is generated only if all Class 1 inputs have completed the

scan, and the last shared input conversion has completed. Until both of these con-

ditions are met, the scan sequence is still in effect. Therefore, the EOS Interrupt can

be used for any scan sequence, with any combination of input types.

Section 22. 12-bit High-Speed SAR ADC

Example 22-3: ADC Scanning Multiple Inputs

int main(int argc, char** argv) {

int result[3];

/* Configure ADCCON1 */

ADCCON1 = 0; // No ADCCON1 features are enabled including: Stop-in-Idle, turbo,

// CVD mode, Fractional mode and scan trigger source.

ADCCON1bits.SELRES = 3; // ADC7 resolution is 12 bits

ADCCON1bits.STRGSRC = 1; // Select scan trigger.

/* Configure ADCCON2 */

ADCCON2bits.SAMC = 5; // ADC7 sampling time = 5 * TAD7

ADCCON2bits.ADCDIV = 1; // ADC7 clock freq is half of control clock = TAD7

/* Initialize warm up time register */

ADCANCON = 0;

ADCANCONbits.WKUPCLKCNT = 5; // Wakeup exponent = 32 * TADx

/* Clock setting */

ADCCON3bits.ADCSEL = 0; // Select input clock source

ADCCON3bits.CONCLKDIV = 1; // Control clock frequency is half of input clock

ADCCON3bits.VREFSEL = 0; // Select AVDD and AVSS as reference source

ADC0TIMEbits.ADCDIV = 1; // ADC0 clock frequency is half of control clock = TAD0

ADC0TIMEbits.SAMC = 5; // ADC0 sampling time = 5 * TAD0

ADC0TIMEbits.SELRES = 3; // ADC0 resolution is 12 bits

/* Select analog input for ADC modules, no presync trigger, not sync sampling */

ADCTRGMODEbits.SH0ALT = 0; // ADC0 = AN0

/* Select ADC input mode */

ADCIMCON1bits.SIGN0 = 0; // unsigned data format

ADCIMCON1bits.DIFF0 = 0; // Single ended mode

ADCIMCON1bits.SIGN8 = 0; // unsigned data format

ADCIMCON1bits.DIFF8 = 0; // Single ended mode

ADCIMCON1bits.SIGN40 = 0; // unsigned data format

ADCIMCON1bits.DIFF40 = 0; // Single ended mode

/* Configure ADCGIRQENx */

ADCGIRQEN1 = 0; // No interrupts are used.

ADCGIRQEN2 = 0;

/* Configure ADCCSSx */

ADCCSS1 = 0; // Clear all bits

ADCCSS2 = 0;

ADCCSS1bits.CSS0 = 1; // AN0 (Class 1) set for scan

ADCCSS1bits.CSS8 = 1; // AN8 (Class 2) set for scan

ADCCSS2bits.CSS40 = 1; // AN40 (Class 3) set for scan

/* Configure ADCCMPCONx */

ADCCMPCON1 = 0; // No digital comparators are used. Setting the ADCCMPCONx

ADCCMPCON2 = 0; // register to '0' ensures that the comparator is disabled.

ADCCMPCON3 = 0; // Other registers are ‘don't care’.

ADCCMPCON4 = 0;

ADCCMPCON5 = 0;

ADCCMPCON6 = 0;

/* Configure ADCFLTRx */

ADCFLTR1 = 0; // No oversampling filters are used.

ADCFLTR2 = 0;

ADCFLTR3 = 0;

ADCFLTR4 = 0;

ADCFLTR5 = 0;

ADCFLTR6 = 0;

PIC32 Family Reference Manual

Example 22-3: ADC Scanning Multiple Inputs (Continued)

/* Set up the trigger sources */

ADCTRG1bits.TRGSRC0 = 3; // Set AN0 (Class 1) to trigger from scan source

ADCTRG3bits.TRGSRC8 = 3; // Set AN8 (Class 2) to trigger from scan source

// AN40 (Class 3) always uses scan trigger source

/* Early interrupt */

ADCEIEN1 = 0; // No early interrupt

ADCEIEN2 = 0;

/* Turn the ADC on */

ADCCON1bits.ON = 1;

/* Wait for voltage reference to be stable */

while(!ADCCON2bits.BGVRRDY); // Wait until the reference voltage is ready

while(ADCCON2bits.REFFLT); // Wait if there is a fault with the reference voltage

/* Enable clock to analog circuit */

ADCANCONbits.ANEN0 = 1; // Enable the clock to analog bias ADC0

ADCANCONbits.ANEN7 = 1; // Enable, ADC7

/* Wait for ADC to be ready */

while(!ADCANCONbits.WKRDY0); // Wait until ADC0 is ready

while(!ADCANCONbits.WKRDY7); // Wait until ADC7 is ready

/* Enable the ADC module */

ADCCON3bits.DIGEN0 = 1; // Enable ADC0

ADCCON3bits.DIGEN7 = 1; // Enable ADC7

while (1) {

/* Trigger a conversion */

ADCCON3bits.GSWTRG = 1;

/* Wait the conversions to complete */

while (ADCDSTAT1bits.ARDY0 == 0);

/* fetch the result */

result[0] = ADCDATA0;

while (ADCDSTAT1bits.ARDY8 == 0);

/* fetch the result */

result[1] = ADCDATA8;

while (ADCDSTAT2bits.ARDY40 == 0);

/* fetch the result */

result[2] = ADCDATA40;

* Process results here

}

return (1);

}

Section 22. 12-bit High-Speed SAR ADC

22.4.7 Selecting the Analog-to-Digital Conversion Clock Source and

Prescaler

The ADC module can use the internal Fast RC (FRC) oscillator output, system clock (SYSCLK),

reference clock (REFCLK3) or peripheral bus clock (PBCLK) as the conversion clock source

). Refer to the “ADC” chapter in the specific device data sheet to determine which reference

clock output source may be available.

When the ADCSEL<1:0> bits (ADCCON2<31:30>) = 01, the internal FRC oscillator is used as

the ADC clock source. When using the internal FRC oscillator, the ADC module can continue to

function in Sleep and Idle modes.

For correct analog-to-digital conversions, the conversion clock limits must not be exceeded.

Clock frequencies from 1 MHz to 28 MHz are supported by the ADC module.

The maximum rate at which analog-to-digital conversions may be completed by the ADC module

(effective conversion throughput) is >3 Msps. However, the maximum rate at which a single input

can be converted is dependent on the sampling time requirements. In addition, the sampling time

depends on the output impedance of the analog signal source. More information on sampling

time is provided in the section 22.10 “ADC Sampling Requirements”.

The ADC clock structure is designed to provide separate and independent clocks to dedicated

ADC modules and to the shared ADC module. The input clock source for the ADC is selected

using the ADCSEL<1:0> bits (ADCCON3<31:30>). The input clock is further divided by the

control clock divider CONCLKDIV<5:0> bits (ADCCON3<29:24>). The output clock is called the

“ADC control clock” with a time period of T

The ADC control clock is divided by the ADCDIV<6:0> bits (ADCxTIME<22:16>). This acts as

the clock source for the respective dedicated ADC modules with a time period of T

The ADC control clock is divided before it is used for the shared ADC by the ADCDIV<6:0> bits

(ADCCON2<6:0>). The time period for this clock is denoted as T

Figure 22-14: Clock Derivation for Dedicated (Class 1) and Shared ADC Modules

Note: It is recommended that applications that require precise timing of ADC acquisitions

use SYSCLK as the clock source for the ADC.

MUX

ADCSEL<1:0> (AD&CON3<31:30>)

CONCLKDIV<5:0>

(AD CON3<29:24>)&

ADCDIV<6:0>

(AD CON2<6:0>)&

Clock for $'&

(TAD)

ADCDIV<6:0>

(AD TIME<22:16>)&[

Clock for $'&

$'& (TAD7$'

ADC Control clock (TQ)

Note: Refer to the “ADC” chapter in the specific device data sheet to determine the actual number of

dedicated and shared ADC modules.

PIC32 Family Reference Manual

22.4.8 Sample and Conversion Time

Equation 22-1: Sample Time for Dedicated ADC Modules

Equation 22-2: Sample Time for the Shared ADC Module

22.4.9 Turning ON the ADC

Turning ON the ADC module involves these steps:

When the ADC module enable bit, ON (ADCCON1<15>), is set to ‘1’, the module is in Active

mode and is fully powered and functional. When the ON bit is ‘0’, the ADC module is disabled.

Once disabled, the digital and analog portions of the ADC are turned off for maximum current

savings. In addition to setting the ON bit, the analog and digital circuits of ADC should be turned

ON. More details are provided in the Section 22.7.3 “ADC Low-power Mode”.

22.4.10 ADC Status Bits

The ADC module includes the WKRDYx/WKRDY7 status bit in the ADCANCON register, which

indicates the current state of ADC Analog and bias circuit. The user application should not

perform any ADC operations until this bit is set.

Note: Writing to the ADC control bits that control the ADC clock, input assignments,

scanning, voltage reference selection, S&H circuit operating modes, and interrupt

configuration is not recommended while the ADC module is enabled.

SAMC

= ((ADCxTIME<9:0> +2)*T

)

conversion

= ((Number of Bits Resolution + 1) * T

)

SAMC

= ((ADCCON2<25:16> + 2) * T

)

conversion

= ((Number of Bits Resolution + 1) * T

)

ADC Scan Throughput rate = (1/((tSAMC + Tconversion)*#ADC ANx Scan inputs used))

Section 22. 12-bit High-Speed SAR ADC

22.5 ADDITIONAL ADC FUNCTIONS

This section describes some additional features of the ADC module, which includes:

• Digital comparator

• Oversampling filter

• Turbo mode

• CVD mode

22.5.1 Digital Comparator

The ADC module features digital comparators that can be used to monitor selected analog input

conversion results and generate interrupts when a conversion result is within the user-specified

limits. Conversion triggers are still required to initiate conversions. The comparison occurs

automatically once the conversion is complete. This feature is enabled by setting the Digital

Comparator Module Enable bit, ENDCMP (ADCCMPCONx<7>).

The user application makes use of an interrupt that is generated when the analog-to-digital

conversion result is higher or lower than the specified high and low limit values in the ADCCMPx

(ADCCMPx<31:16>) and the DCMPLO<15:0> bits (ADCCMPx<15:0>).

The CMPEx bits (‘x’ = 0 through 31) in the ADCCMPENx registers are used to specify which

analog inputs are monitored by the digital comparator (for the first 32 analog inputs, ANx, where

‘x’ = 0 through 31). The ADCCMPCONx register specifies the comparison conditions that will

generate an interrupt, as follows:

• When IEBTWN = 1, interrupt is generated when DCMPLO ≤ ADCDATA < DCMPHI

• When IEHIHI = 1, interrupt is generated when DCMPHI ≤ ADCDATA

• When IEHILO = 1, interrupt is generated when ADCDATA < DCMPHI

• When IELOHI = 1, interrupt is generated when DCMPLO ≤ ADCDATA

• When IELOLO = 1, interrupt is generated when ADCDATA < DCMPLO

The comparator event generation is illustrated in Figure 22-15. When the ADC module generates

a conversion result, the conversion result is provided to the comparator. The comparator uses

the DIFFx and SIGNx bits of the ADCIMCONx register (depending on the analog input used) to

determine the data format used and appropriately select whether the comparison should be

signed or unsigned. The global ADC setting, which is specified by the FRACT bit

(ADCCON1<23>), is also used to set the fractional or integer format. The digital comparator

compares the ADC result with the high and low limit values (depending on the selected

comparison criteria) in the ADCCMPx register.

Depending on the comparator results, a digital comparator interrupt event may be generated. If

a comparator event occurs, the Digital Comparator Interrupt Event Detected status bit, DCMPED

(ADCCMPCONx<5>), is set, and the Analog Input Identification (ID) bits, AINID<4:0>

(ADCCMPCONx<12:8>), are automatically updated so that the user application knows which

analog input generated the interrupt event.

Note 1: The Digital Comparator module supports only the first 32 analog inputs

(AN0 through AN31).

2: The user software must format the values contained in the ADCCMPx registers to

match converted data format as either signed or unsigned, and fractional or integer.

PIC32 Family Reference Manual

Figure 22-15: Digital Comparator

ADCDATAx

DCMPLO

ADCDATAx

DCMPLO

ADCDATAx

DCMPLO

ADCDATAx

DCMPHI

ADCDATAx

DCMPHI

ADCDATAx

DCMPHI

IELOLO

IELOHI

IEHILO

IEHIHI

IEBTWN

ENDCMP

Interrupt Generation Logic For Digital Comparator

ADCDATAx

Section 22. 12-bit High-Speed SAR ADC

Example 22-4: ADC Digital Comparator

int main(int argc, char** argv) {

int result = 0, eventFlag = 0;

/* Configure ADCCON1 */

ADCCON1 = 0; // No ADCCON1 features are enabled including: Stop-in-Idle,

// turbo, CVD mode, Fractional mode and scan trigger source.

ADCCON1bits.SELRES = 3; // ADC resolution is 12 bits

ADCCON1bits.STRGSRC = 0; // No scan trigger.

/* Configure ADCCON2 */

ADCCON2bits.SAMC = 5; // ADC7 sampling time = 5 * TAD7

ADCCON2bits.ADCDIV = 1; // ADC7 clock freq = TAD7

/* Initialize warm up time register */

ADCANCON = 0;

ADCANCONbits.WKUPCLKCNT = 5; // Wakeup exponent = 32 * TADx

/* Clock setting */

ADCCON3 = 0;

ADCCON3bits.ADCSEL = 0; // Select input clock source

ADCCON3bits.CONCLKDIV = 1; // Control clock frequency is half of input clock

ADCCON3bits.VREFSEL = 0; // Select AVDD and AVSS as reference source

/* No selection for dedicated ADC modules, no presync trigger, not sync sampling */

ADCTRGMODEbits = 0;

/* Select ADC input mode */

ADCIMCON1bits.SIGN8 = 0; // unsigned data format

ADCIMCON1bits.DIFF8 = 0; // Single ended mode

/* Configure ADCGIRQENx */

ADCGIRQEN1 = 0; // No interrupts are used

ADCGIRQEN2 = 0;

/* Configure ADCCSSx */

ADCCSS1 = 0; // No scanning is used

ADCCSS2 = 0;

/* Configure ADCCMPCONx */

ADCCMP1 = 0; // Clear the register

ADCCMP1bits.DCMPHI = 0xC00; // High limit is a 3072 result.

ADCCMP1bits.DCMPLO = 0x500; // Low limit is a 1280 result.

ADCCMPCON1bits.IEBTWN = 1; // Create an event when the measured result is

// >= low limits and < high limit.

ADCCMPEN1 = 0; // Clear all enable bits

ADCCMPEN1bits.CMPE8 = 1; // set the bit corresponding to AN8

ADCCMPCON1bits.ENDCMP = 1; // enable comparator

ADCCMPCON2 = 0;

ADCCMPCON3 = 0;

ADCCMPCON4 = 0;

ADCCMPCON5 = 0;

ADCCMPCON6 = 0;

/* Configure ADCFLTRx */

ADCFLTR1 = 0; // No oversampling filters are used.

ADCFLTR2 = 0;

ADCFLTR3 = 0;

ADCFLTR4 = 0;

ADCFLTR5 = 0;

ADCFLTR6 = 0;

PIC32 Family Reference Manual

Example 22-4: ADC Digital Comparator (Continued)

/* Set up the trigger sources */

ADCTRG3bits.TRGSRC8 = 3; // Set AN8 (Class 2) to trigger from scan source

/* Early interrupt */

ADCEIEN1 = 0; // No early interrupt

ADCEIEN2 = 0;

/* Turn the ADC on */

ADCCON1bits.ON = 1;

/* Wait for voltage reference to be stable */

while(!ADCCON2bits.BGVRRDY); // Wait until the reference voltage is ready

while(ADCCON2bits.REFFLT); // Wait if there is a fault with the reference voltage

/* Enable clock to analog circuit */

ADCANCONbits.ANEN7 = 1; // Enable the clock to analog bias

/* Wait for ADC to be ready */

while(!ADCANCONbits.WKRDY7); // Wait until ADC7 is ready

/* Enable the ADC module */

ADCCON3bits.DIGEN7 = 1; // Enable ADC7

while (1) {

/* Trigger a conversion */

ADCCON3bits.GSWTRG = 1;

while (ADCDSTAT1bits.ARDY8 == 0);

/* fetch the result */

result = ADCDATA8;

/* Note: It is not necessary to fetch the result for the digital

* comparator to work. In this example we are triggering from

* software so we are using the ARDY8 to gate our loop. Reading the

* data clears the ARDY bit.

/* See if we have a comparator event*/

if (ADCCMPCON1bits.DCMPED == 1) {

eventFlag = 1;

* Process results here

}

return (1);

}

Section 22. 12-bit High-Speed SAR ADC

22.5.2 Oversampling Digital Filter

The ADC module supports up to six oversampling digital filters. The oversampling digital filter

consists of an accumulator and a decimator (down-sampler), which function together as a

low-pass filter. By sampling an analog input at a higher-than-required sample rate, and then

processing the data through the oversampling digital filter, the effective resolution of the ADC

module can be increased at the expense of decreased conversion throughput.

To obtain ‘x’ bits of extra resolution, number of samples required (over and above the Nyquist

rate) = (2

)

• 4x oversampling yields one extra bit of resolution (total 13 bits resolution)

• 16x oversampling yields two extra bits of resolution (total 14 bits resolution)

• 64x oversampling provides three extra bits of resolution (total 15 bits resolution)

• 256x oversampling provides four extra bits of resolution (total 16 bits resolution)

The digital filter also has an averaging mode, where it accumulates the samples and divides it by

the number of samples.

The user application should configure the following bits to perform an oversampling conversion:

• Select the amount of oversampling through the Oversampling Filter Oversampling Ratio

(OVRSAM<2:0>) bits in the ADC Filter register (ADCFLTRx<28:26>)

• Set the filter mode to either Oversampling mode or Averaging mode using the DFMODE bit

(ADCFLTRx<29>)

• If the filter is set to Averaging mode and the data format is set to fractional (FRACT bit), set

or clear the DATA16EN bit (ADCFLTRx<30>) to set the output resolution

• Set the sample time for subsequent samples:

- If using Class 1 inputs, select the sample time of the recurring conversions using the

SAMC<9:0> bits ADCxTIME<9:0>)

- If using Class 2 inputs, select the sample time using the SAMC<9:0> bits (ADC-

CON2<25:16>)

• Select the specific analog input to be oversampled by configuring the Analog Input ID

Selection bits, CHNLID<4:0> (ADCFLTRx<20:16>)

• If needed, include the oversampling filter interrupt event in the global ADC interrupt, by set-

ting the Accumulator Filter Global Interrupt Enable bit, AFGIEN (ADCFLTRx<25>)

• Enable the oversampling filter by setting the Oversampling Filter Accumulator Enable bit,

AFEN (ADCFLTRx<31>)

Once the digital filter module is configured, the filter’s control logic waits for an external trigger to

initiate the process. The trigger signal for the analog input to be oversampled causes the

accumulator to be cleared and initiates the first conversion. The trigger also force the trigger

sensitivity into level mode and forces the trigger itself to 1 as long as the filter needs to acquire

the user specified number of samples via the OVRSAM<2:0> bits (ADCFLTRx<28:26>). The

time delay between each acquired sample is decided by the set sample time (SAMC<9:0> bits

in the ADCxTIME register for Class 1 or the SAMC<9:0> bits in the ADCCON2 register for Class

2) and the time for conversion. When the required number set by OVRSAM<2:0> have been

received and processed, the data stored in the FLTRDATA<15:0> bit (ADCFLTRx<15:0>) and

the AFRDY bit (ADCFLTRx<24>) is set, and the interrupt is generated (if enabled).

Note 1: Only Class 1 and Class 2 analog inputs can engage the digital filter. Therefore, the

CHNLID<4:0> bits are 5 bits wide (0 to 31).

2: During the burst conversion process (repeated trigger until all required data for

oversampling is obtained) in the case of filtering Class 2 input using the shared

ADC module, higher priority ADC inputs may still process conversions; lower prior-

ity ADC conversion requests are held waiting until the filter burst sequence has

been completed.

3: If higher priority requests occur during the digital filter sequence, they delay the

completion of the filtering process. This delay may affect the accuracy of the result

because the multiple samples will not be contiguous. The user should arrange the

initiation trigger for the over sampling filters to occur while there are no expected

interruptions from higher priority ADC conversion requests.

PIC32 Family Reference Manual

Figure 22-16 illustrates 4x oversampling on a Class 1 input. Prior to the trigger, the Class 1 input

is sampling the input signal. The trigger starts the first conversion. Once the conversion is

complete, the ADC goes into sampling mode. When the sampling time expires, a new conversion

sequence occurs. After each sample is converted it is added to the accumulator. The sequence

repeats until the number of samples specified by the OVRSAM<2:0> bits have been

accumulated. When the last sample has been converted, its value is added to the accumulator.

The result is right shifted and then stored in the FLTRDATA<15:0> bits.

Figure 22-16: 4x Oversampling of a Class 1 Input

If multiple Class 1 inputs use filtering, they all operate in parallel and independent from each

other.

Figure 22-17 illustrates 4x Oversampling using a Class 2 input. Triggering a Class 2 input

initiates sampling for the length of time defined by the SAMC<9:0> bits. Retriggers generated by

the oversampling logic use the SAMC<9:0> bits, to set the sample time.

Since Class 2 inputs use the shared S&H, oversampling blocks lower priority Class 2 and Class

3 triggers. Higher priority Class 2 triggers will completely disrupt the oversampling process, and

therefore, should be avoided completely. The same priority rule applies to two Class 2 inputs that

use two digital filters. In such a case, the higher priority input will also use the shared ADC

module in Burst mode and will prevent the lower priority input to use the shared ADC. Only after

all required samples are obtained by the higher priority input, the lower priority input can use the

shared ADC to acquire samples for its own digital filtering.

Sample AN1 Hold AN1

Convert AN1

Prior to trigger, S&H is

sampling analog input

Initial trigger clears the

accumulator and starts

the conversion process

Sample AN1 Hold AN1

Convert AN1

Sample AN1 Hold AN1

Convert AN1

Sample AN1 Hold AN1

Convert AN1

Converted results are added to the accumulator

Sample AN1

Sample time decided by

SAMC<9:0> bit (AD TIME<9:0>)&[

The last conversion results in a 14-bit sum, the sum is right-shifted by

one producing a 13-bit result in FLTRDATA<15:0> (AD& [FLTR <15:0>)

Retriggers are generated automatically, until the number of samples

set by OVRSAM<2:0> (AD&FLTRx<28:26>) are captured.

Section 22. 12-bit High-Speed SAR ADC

Figure 22-17: 4x Oversampling of a Class 2 Input

Example 22-5: ADC Digital Oversampling Filter

Sample AN8 Hold AN8

Convert AN8

Prior to trigger, S&H is

disconnected

Initial trigger clears the

accumulator and starts

the sampling process

Sample AN8 Hold AN8

Convert AN8

Sample AN8 Hold AN8

Convert AN8

Sample AN8 Hold AN8

Convert AN8

Converted results are added to the accumulator

Sample time decided by the SAMC<9:0> bits

(AD CON2<25:16>)&

Last conversion results in a 14-bit sum, the sum is right-shifted by one

producing a 13-bit result in FLTRDATA<15:0> (AD&FLTR <15:0>)[

Retriggers are generated automatically, until the number of samples

set by OVRSAM<2:0> (AD&FLTRx<28:26>) are captured.

Disconnected

int main(int argc, char** argv) {

int result;

/* Configure ADCCON1 */

ADCCON1 = 0; // No ADCCON1 features are enabled including: Stop-in-Idle, turbo,

// CVD mode, Fractional mode and scan trigger source.

/* Configure ADCCON2 */

ADCCON2 = 0; // Since, we are using only the Class 1 inputs, no setting is

// required for ADCDIV

/* Initialize warm up time register */

ADCANCON = 0;

ADCANCONbits.WKUPCLKCNT = 5; // Wake-up exponent = 32 * TADx

/* Clock setting */

ADCCON3 = 0;

ADCCON3bits.ADCSEL = 0; // Select input clock source

ADCCON3bits.CONCLKDIV = 1; // Control clock frequency is half of input clock

ADCCON3bits.VREFSEL = 0; // Select AVDD and AVSS as reference source

ADC0TIMEbits.ADCDIV = 1; // ADC0 clock frequency is half of control clock = TAD0

ADC0TIMEbits.SAMC = 5; // ADC0 sampling time = 5 * TAD0

ADC0TIMEbits.SELRES = 3; // ADC0 resolution is 12 bits

/* Select analog input for ADC modules, no presync trigger, not sync sampling */

ADCTRGMODEbits.SH0ALT = 0; // ADC0 = AN0

/* Select ADC input mode */

ADCIMCON1bits.SIGN0 = 0; // unsigned data format

ADCIMCON1bits.DIFF0 = 0; // Single ended mode

/* Configure ADCGIRQENx */

ADCGIRQEN1 = 0; // No interrupts are used

ADCGIRQEN2 = 0;

/* Configure ADCCSSx */

ADCCSS1 = 0; // No scanning is used

ADCCSS2 = 0;

PIC32 Family Reference Manual

Example 22-5: ADC Digital Oversampling Filter (Continued)

/* Configure ADCCMPCONx */

ADCCMPCON1 = 0; // No digital comparators are used. Setting the ADCCMPCONx

ADCCMPCON2 = 0; // register to '0' ensures that the comparator is disabled.

ADCCMPCON3 = 0; // Other registers are ‘don't care’.

ADCCMPCON4 = 0;

ADCCMPCON5 = 0;

ADCCMPCON6 = 0;

/* Configure ADCFLTRx */

ADCFLTR1 = 0; // Clear all bits

ADCFLTR1bits.CHNLID = 0; // Use AN0 as the source

ADCFLTR1bits.OVRSAM = 3; // 16x oversampling

ADCFLTR1bits.DFMODE = 0; // Oversampling mode

ADCFLTR1bits.AFEN = 1; // Enable filter 1

ADCFLTR2 = 0; // Clear all bits

ADCFLTR3 = 0;

ADCFLTR4 = 0;

ADCFLTR5 = 0;

ADCFLTR6 = 0;

/* Set up the trigger sources */

ADCTGSNSbits.LVL0 = 0; // Edge trigger

ADCTRG1bits.TRGSRC0 = 1; // Set AN0 to trigger from software.

/* Turn the ADC on */

ADCCON1bits.ON = 1;

/* Wait for voltage reference to be stable */

while(!ADCCON2bits.BGVRRDY); // Wait until the reference voltage is ready

while(ADCCON2bits.REFFLT); // Wait if there is a fault with the reference voltage

/* Enable clock to analog circuit */

ADCANCONbits.ANEN0 = 1; // Enable the clock to analog bias and digital control

/* Wait for ADC to be ready */

while(!ADCANCONbits.WKRDY0); // Wait until ADC0 is ready

/* Enable the ADC module */

ADCCON3bits.DIGEN0 = 1; // Enable ADC0

while (1) {

/* Trigger a conversion */

ADCCON3bits.GSWTRG = 1;

/* Wait for the oversampling process to complete */

while (ADCFLTR1bits.AFRDY == 0);

/* fetch the result */

result = ADCFLTR1bits.FLTRDATA;

* Process result Here

* Note 1: Loop time determines the sampling time for the first sample.

* remaining samples sample time is determined by set sampling + conversion time.

* Note 2: The first 5 samples may have reduced accuracy.

}

return (1);

}

Figure 22-18: ADC Filter Comparisons Example

Edge_Conv_Trig_1

Edge_Conv_Trig_2

Edge_Conv_Trig_3

Edge_Conv_Trig_4

ADC Edge Trigger Period

TRGSRCx<4:0> bits (ADCTRGx<31:0>)

Edge_Conv_Trig_1

Edge_Conv_Trig_2

Edge_Conv_Trig_3

Edge_Conv_Trig_4

SAMC + Conv Period

ADC_Meas_1A+B+C+D

Conv_1B

Conv_1C

Conv_1D

Conv_2B

Conv_2C

Conv_2D

Conv_3B

Conv_3C

Conv_3D

Conv_4B

Conv_4C

Conv_4D

ADC Edge Trigger Period

TRGSRCx<4:0> bits (ADCTRGx<31:0>)

ADC_Meas_2A+B+C+D

ADC_Meas_3A+B+C+D

ADC_Meas_4A+B+C+D

DFMODE bit (ADCFLTRx< 29>) = 1DFMODE bit (ADCFLTRx<29>) = 0

When the DFMODE bit (ADCFLTRx<29> = 0

Mininum Trigger Period  {(OVRSAM<2:0> bits (ADCFLTRx<28:26>)) [(SAMC<7:0> bits (ADCxTIME<7:0>)) TAD + ((SELRES<1:0> bits (ADCxT

Example:

OVRSAM<2:0> bits (ADCFLTRx<28:26 >) = 4x Samples

SAMC<7:0> bits (ADCxTIME<7:0) = 3 TAD

SELRES<1:0> bits (ADCxTIME<25:24>) = 12 bits

Edge_Conv_Trig_x

Minimum Trigger Period  (4* (3 T AD AD+ 13 T )) = 64 TAD

AFRDY bit (ADCFLTRx<24>) = 1

13-bit ADC Result (Interrupt)

AFRDY bit (ADCFLTRx<24>) = 1

13-bit ADC Result (Interrupt)

AFRDY bit (ADCFLTRx<24>) = 1

13-bit ADC Result (Interrupt)

AFRDY bit (A

12-bit ADC R

(ADC_Meas_1+2+3+4) / 4

Conv_1

Conv_2

Conv_3

PIC32 Family Reference Manual

22.5.3 FIFO Data Output

The dedicated ADC module has a provision to store the output data into a FIFO. This could be

useful while the ADC is used to convert signals at a very high throughput. The ADCFIFO register

is the read port for the FIFO. The FIFO is 128 level deep and is circular in nature.

The ADC module that needs to use the FIFO is selected by the ADCxEN bits

(ADCFSTAT<30:24>). If more than one ADC module needs to use FIFO, all those respective bits

can be set among ADCxEN. While reading the data from FIFO, the ADCID<2:0> bits

(ADCFSTAT<2:0>) should be read first and then the data from the ADCFIFO register. This way,

the user application knows from which ADC module the data originated from the FIFO. The FEN

bit (ADCFSTAT<31>) bit is set to enable the FIFO operation. Once data is available in FIFO, the

FRDY bit (ADCFSTAT<22>) is set and remains set until the FIFO is entirely read and is devoid

of any data. If required, the FIEN bit (ADCFSTAT<23) can be set to generate interrupt.

Example 22-6: ADC FIFO Usage for Class 1 Input

Note 1: FIFO depth depends on the device. Please refer to the specific device data sheet

for details.

2: While retrieving data from the FIFO, user code should read both the ADCID<2:0>

bits and the ADCFIFO register during each successive reads.

int main(int argc, char** argv) {

int result[128], index = 0;

/* Configure ADCCON1 */

ADCCON1 = 0; // No ADCCON1 features are enabled including: Stop-in-Idle, turbo,

// CVD mode, Fractional mode and scan trigger source.

/* Configure ADCCON2 */

ADCCON2 = 0; // Since, we are using only the Class 1 inputs, no setting is

// required for ADCDIV

/* Initialize warm up time register */

ADCANCON = 0;

ADCANCONbits.WKUPCLKCNT = 5; // Wakeup exponent = 32 * TADx

/* Clock setting */

ADCCON3 = 0;

ADCCON3bits.ADCSEL = 0; // Select input clock source

ADCCON3bits.CONCLKDIV = 1; // Control clock frequency is half of input clock

ADCCON3bits.VREFSEL = 0; // Select AVDD and AVSS as reference source

ADC0TIMEbits.ADCDIV = 1; // ADC0 clock frequency is half of control clock = TAD0

ADC0TIMEbits.SAMC = 5; // ADC0 sampling time = 5 * TAD0

ADC0TIMEbits.SELRES = 3; // ADC0 resolution is 12 bits

/* Select analog input for ADC modules, no presync trigger, not sync sampling */

ADCTRGMODEbits.SH0ALT = 0; // ADC0 = AN0

/* Select ADC input mode */

ADCIMCON1bits.SIGN0 = 0; // unsigned data format

ADCIMCON1bits.DIFF0 = 0; // Single ended mode

/* Configure ADCGIRQENx */

ADCGIRQEN1 = 0; // No interrupts are used

ADCGIRQEN2 = 0;

/* Configure ADCCSSx */

ADCCSS1 = 0; // No scanning is used

ADCCSS2 = 0;

/* Configure ADCCMPCONx */

ADCCMPCON1 = 0; // No digital comparators are used. Setting the ADCCMPCONx

ADCCMPCON2 = 0; // register to '0' ensures that the comparator is disabled.

ADCCMPCON3 = 0; // Other registers are ‘don't care’.

ADCCMPCON4 = 0;

ADCCMPCON5 = 0;

ADCCMPCON6 = 0;

Section 22. 12-bit High-Speed SAR ADC

Example 22-6: ADC FIFO Usage for Class 1 Input (Continued)

/* Configure ADCFLTRx */

ADCFLTR1 = 0; // Clear all bits

ADCFLTR2 = 0;

ADCFLTR3 = 0;

ADCFLTR4 = 0;

ADCFLTR5 = 0;

ADCFLTR6 = 0;

/* Set up the trigger sources */

ADCTGSNSbits.LVL0 = 0; // Edge trigger

ADCTRG0bits.TRGSRC0 = 1; // Set AN0 to trigger from software.

/* Early interrupt */

ADCEIEN1 = 0; // No early interrupt

ADCEIEN2 = 0;

/* Set FIFO */

ADCFSTAT = 0; // Clear all bits

ADCFSATbits.ADC0EN = 1; // Select ADC0

ADCFSATbits.FEN = 1; // Enable FIFO

/* Turn the ADC on */

ADCCON1bits.ON = 1;

/* Wait for voltage reference to be stable */

while(!ADCCON2bits.BGVRRDY); // Wait until the reference voltage is ready

while(ADCCON2bits.REFFLT); // Wait if there is a fault with the reference voltage

/* Enable clock to analog circuit */

ADCANCONbits.ANEN0 = 1; // Enable the clock to analog bias and digital control

/* Wait for ADC to be ready */

while(!ADCANCONbits.WKRDY0); // Wait until ADC0 is ready

/* Enable the ADC module */

ADCCON3bits.DIGEN0 = 1; // Enable ADC0

while (1) {

/* Trigger a conversion */

ADCCON3bits.GSWTRG = 1;

/* Wait the conversions to complete and data available in FIFO */

while (ADCFSTATbits.FRDY == 0);

/* Once FIFO bit is set, read all possible data, until bit is clear */

while(ADCFSTATbits.FRDY)

{

/* If data overflow occurred in FIFO, break read process */

if(ADCFSTATbits.FWROVERR)

{

break;

}

/* if ADC ID is really '0', read data.

This is more appropriate when multiple ADC modules are

using the FIFO, therefore, reading the ADC ID will

identify the ADC and data relation */

if(ADCFSTATbits.ADCID == 0)

{

/* Read data from FIFO */

result[index] = ADCFIFO;

/* For each FIFO read, ADCFSTATbits.FCNT will keep reducing */

index++;

if(index >= 128)

index = 0;

}

* Process results here

}

return (1);

}

PIC32 Family Reference Manual

22.5.4 Dedicated DMA-based Data Output

Depending on the device, each dedicated ADC module has a DMA engine that can be used to

store converted data directly into system memory (RAM). Refer to the “ADC” chapter in the

specific device data sheet to determine whether this feature is available for your device.

If the DMACNTEN bit in the ADCDMASTAT register is set, the ADC module current sample count

is also written by the DMA engine into system RAM starting at the address specified in the

ADCCNTB register.

The size of the buffer used for storage is specified by the DMABL<2:0> bits

(ADCCON1<2:0>). Also, the RAM address where the output data should be stored is

specified by the DMABADDR<31:0> bits in the ADCDMAB register. Each dedicated ADC

module has two buffers: Buffer A and Buffer B.

Since DMABL<2:0> counts the number of data and each data is 16 bits, the actual size of the

buffer (in bytes) for each ADC module is given by the formula:

= 2

(ADCCON1bits.DMABL + 1)

The channel storage buffers spaces are contiguous in the System RAM, starting at the base

address (given by the ADCDMAB register) with the ADC0 Buffer A, followed by the ADC0

Buffer B, followed by the ADC1 Buffer A, followed by the ADC1 Buffer B, and so on in the natural

order of the channel number assignments.

Table 22-6: DMA Buffer Format When Used by Multiple ADC Modules

As shown in Table 22-6, the user can get up to 128 samples (two bytes per sample) for each ADC

module until data loss occurs by new data overwriting old data. The DMA engine will wrap around

the address for each channel inside its own allocated RAM space.

ADCx, ‘x’ = 0 through 6, will have Buffer A starting at:

= ADCDMAB + (2 * x) * 2

(ADCCON1bits.DMABL + 1)

ADCx, ‘x’ = 0 through 6, will have Buffer B starting at:

= ADCDMAB + (2 * (x + 1)) * 2

(ADCCON1bits.DMABL + 1)

The ADCCNTB register contains the user-given address at which (if the DMACNTEN bit

(ADCDMASTAT<15>) is set) the DMA engine will start saving the current count of output

samples already written to each of the buffers in the System RAM for each ADC module. The

ADCx will have its Buffer A current sample count saved at the address ((ADCCNTB) + 2 * x) and

its Buffer B current sample count saved at the address ((ADCCNTB) + (2 * x + 1)). Each ADC

buffer count takes only 1 byte of RAM storage, because the maximum value is 128. At any time,

by reading the memory location specified by ADCCNTB register, the user can know the number

of available data for each ADC (0 through 6) and each buffer (A, B); even before the RAFx or

RBFx bit is set.

ADC

Module ID Buffer RAM Address Space

0 A (DMABADDR<31:0>) + 0 to (DMABADDR<31:0>) + 255

0 B (DMABADDR<31:0>) + 256 to (DMABADDR<31:0>) + 511

1 A (DMABADDR<31:0>) + 512 to (DMABADDR<31:0>) + 767

1 B (DMABADDR<31:0>) + 768 to (DMABADDR<31:0>) + 1023

2 A (DMABADDR<31:0>) + 1024 to (DMABADDR<31:0>) + 1279

2 B (DMABADDR<31:0>) + 1280 to (DMABADDR<31:0>) + 1535

•

6 A (DMABADDR<31:0>) + 3072 to (DMABADDR<31:0>) + 3327

6 B (DMABADDR<31:0>) + 3328 to (DMABADDR<31:0>) + 3583

Section 22. 12-bit High-Speed SAR ADC

Table 22-7: DMA Buffer Count Table

Immediately after ADC module (0 through 6) has been enabled by the user by setting the

DIGENx bit (ADCCON3 register), the DMA engine will reset to zero in both the ADCx Buffer A

sample count at address ((ADCCNTB) + 2 * x) and the Buffer B sample count at address

((ADCCNTB)+(2 * x + 1)).

ADC

Module ID Buffer Sample Count

0 A Read memory (specified by ADCCNTB register) to determine the

number of samples stored.

0 B Read memory (specified by ADCCNTB register) + 1 to determine

the number of samples stored.

1 A Read memory (specified by ADCCNTB register) + 2 to determine

the number of samples stored.

1 B Read memory (specified by ADCCNTB register) + 3 to determine

the number of samples stored.

2 A Read memory (specified by ADCCNTB register) + 4 to determine

the number of samples stored.

2 B Read memory (specified by ADCCNTB register) + 5 to determine

the number of samples stored.

•

6 A

Read memory (specified by ADCCNTB register) + 12 to determine

the number of samples stored.

6 B

Read memory (specified by ADCCNTB register) + 13 to determine

the number of samples stored.

PIC32 Family Reference Manual

22.5.4.1 DMA PING-PONG MODE

The DMA engine Ping-Pong mode of operation when used with a single ADC module, is

described in the following steps:

1. DMA engine saves converted data into a buffer in system RAM for Buffer A.

2. Once Buffer A is full, the RAFx bit (ADCDMASTAT<6:0>) for the used ADC is set. Also,

the DMA engine will start using and saving data into Buffer B.

3. An interrupt will be generated if the RAFIENx bit (ADCDMASTAT<14:8>) is set for the

selected ADC.

4. Inside the ISR, the user application must know the buffer ID (either A or B) by reading the

RAFx or RBFx bits.

5. Whichever bit is set, the user application must read the converted data from the buffer ID

and perform suitable processing on the converted data.

6. While the user application is processing the converted data, the DMA engine is saving

data into Buffer B.

7. Once the user application completes the processing of data from Buffer A, it waits for

completion of Buffer B.

If an application needs to use the data being stored in a buffer before the buffer is full, the

following steps are necessary:

1. To locate the data being saved in buffer, the user code should have enabled DMACNTEN

bit (ADCDMASTAT<15> register).

2. The current sample count can be retrieved from (ADCCNTB + (2 * x + 1)) (considering

Buffer B being used), and then read the suitable memory offset specified in the ADCDMAB

3. Once Buffer B is full, the RBFx bit for the used channel is set. Also, the DMA engine will

start saving data into Buffer A.

Figure 22-19 illustrates Ping-Pong mode with continuous operation.

Note 1: The initialization of the buffer sample count table to all zeros before enabling the

DMA engine is left completely as a task for the software. It should be done in order

to avoid garbage data in the buffer sample count table before the first sample is

being saved in each of the buffers.

2: A read of the ADCDMASTAT register will clear all status bits in this register.

Because the dedicated ADC modules work completely independent one of another,

more than one status bit can be set at the same time. The user must read the

ADCDMASTAT register and save its contents into a separate variable for logic

bit-level operations to identify which dedicated ADC module buffers are full at that

time.

Section 22. 12-bit High-Speed SAR ADC

Figure 22-19: Repetitive Data Transfer in Ping-Pong Mode

DMABADDR<31:0>

Transfer 1

Transfer 2

Transfer 3

Transfer n

COUNT++

COUNT = 0

Set RAFx (ADCDMASTAT).

Generate interrupt if

RAFIENx bit is set.

Transfer 1

Transfer 2

Transfer 3

Transfer n

COUNT++

Buffer A

Buffer B

COUNT = 2

DMABL<2:0>

COUNT = 2

DMABL<2:0>

Set RBFx (ADCDMASTAT).

Generate interrupt if

RBFIENx bit is set.

PIC32 Family Reference Manual

22.5.5 Capacitive Voltage Divider (CVD) mode

The ADC has CVD mode, which can be used to detect an event of touch in a touch sensor

application. The principle of CVD measurement is based on charge balancing between two

capacitors and then measuring the voltage.

In touch sensing applications, the presence of finger near a pad alters the capacitance of the pad.

This variation in capacitance can be sensed by the CVD module to detect the presence (and

subsequent absence) of a finger.

• When a finger is touching the sensor pad, external capacitance = C

EXT

= C

PAD

+ C

FINGER

• External capacitance of pad (when finger is not touching) = C

EXT

= C

PAD

• Internal capacitance = C

INT

= C

PLINE

+ C

SAMP

Figure 22-20: CVD Mode Diagram

Note: Only shared analog inputs (Class 2 and Class 3) can be used for CVD

measurement.

I/O Pad

CFINGER CPAD CPLINE = 2.5…17.5 pF CSAMP = 5 pF

When finger is touching the pad:

CEXT PAD= C + CFINGER

When finger is removed:

CEXT PAD= C

$'&

CINT

CEXT

Section 22. 12-bit High-Speed SAR ADC

CVD measurement consists of two phases, Positive and Negative.

Positive Phase: The C

EXT

is connected to V

and C

INT

is connected to ground (GND) (as

shown in Figure 22-21). Then, both capacitors are connected in parallel for half of sampling time,

set by the SAMC<9:0> bits (ADCCON2<25:16>). After the half sampling time is complete, the

voltage is converted by the ADC module and is named V

Figure 22-21: CVD Mode Positive Phases Diagram

I/O Pad

CFINGER C CPAD PLINE = 2.5…17.5 pF CSAMP = 5 pF

When finger is touching the pad:

CEXT PAD= C + CFINGER

When finger is removed:

CEXT PAD= C

$'&

CINT

CEXT

VDD GND

PIC32 Family Reference Manual

Negative Phase: The C

EXT

is connected to GND and C

INT

is connected to V

, as shown in

Figure 22-22. Similar to the positive phase, the voltage is measured for the negative phase and

is named as V

Figure 22-22: CVD Mode - Negative Phase Diagram

I/O Pad

CFINGER C CPAD PLINE = 2.5…17.5 pF CSAMP = 5 pF

When finger is touching the pad:

CEXT PAD= C + CFINGER

When finger is removed:

CEXT PAD= C

$'&

CINT

CEXT

GND VDD

Section 22. 12-bit High-Speed SAR ADC

The CVD module internally calculates the difference between V

P and V

and stores the data

in the CVDDATA<15:0> bits (ADCCMPCON1<31:16>) in signed format. The plot in Figure 22-23

shows how during a touch event, the increase in external capacitance causes the (V

- V

to be higher than the non-touch condition (decreased external capacitance).

Figure 22-23: CVD Signal - Difference Between Pressed and Released Differential Values

Equation 22-3 shows the relation (V

P - V

N).

Equation 22-3: V

P and V

N Relation

During a touch condition, C

EXT

increases and (V

P - V

N) increases.

During no touch condition, C

EXT

decreases and (V

P - V

N) reduces.

Digital Comparator 1 is linked to CVD and it can be used to generate a comparator event and

interrupt when a touch is detected, by setting the IEHIHI bit (ADCCMPCON1<3>). The digital

comparator can generate an event when measured (V

P - V

N) is above the value set in the

DCMPHI<15:0> bit (ADCCMP1<31:16>). When the comparator event is detected by reading the

DCMPED bit (ADCCMPCON1<5>), or inside the ISR, the analog input that caused the touch

event can be read from the AINID<5:0> bits (ADCCMPCON1<13:8>).

To ensure maximum sensitivity, C

INT

should have similar value as C

PAD

, which can be done by

suitably selecting the value of C

PLINE

capacitance through the CVDCPL<2:0> bits

(ADCCON2<28:26>).

Time

Negative Phase Positive Phase

Precharge Acquisition Conversion Precharge Acquisition Conversion

Voltage

Internal ADC Hold Capacitor

External Capacitive Sensor

Vreleased

Vpressed

Note: Before CVD is enabled by setting the CVDEN bit, external triggers for all Class 2

and Class 3 inputs are disabled by clearing the TRGSRC<4:0> and

STRGSRC<4:0> bits.

P V

N–  V

EXT

INT

– 

EXT

INT

+ 

------------------------------------

 

=

PIC32 Family Reference Manual

Example 22-7: ADC CVD Mode

unsigned char touchDetected = 0;

void __ISR(_ADC_DC1_VECTOR, IPL3AUTO) _IntHandlerDrvAdc(void)

{

IFS1bits.ADCDC1IF = 0;

/* Check and clear event flag for comparator 1 */

if(ADCCMPCON1bits.DCMPED == 1)

{

/* Verify if comparator event really due to AN21 */

if(ADCCMPCON1bits.AINID == 21)

{

touchDetected = 1;

}

int main(void)

{

/* Configure ADCCON1 */

ADCCON1bits.SELRES = 3; // ADC resolution is 12 bits

ADCCON1bits.STRGSRC = 0; // No scan trigger.

ADCCON1bits.AICPMPEN = 0;

ADCCON1bits.FRACT = 0; // Integer format

/* Configure ADCCON2 */

ADCCON2bits.SAMC = 32; // ADC7 sampling time

ADCCON2bits.ADCDIV = 4; // ADC7 clock freq is half of control clock = TAD7

ADCCON2bits.CVDCPL = 2; // 5 pF is the CVD capacitor value selected

/* Initialize warm up time register */

ADCANCON = 0;

ADCANCONbits.WKUPCLKCNT = 5; // Wakeup exponent = 32 * TADx

/* Clock setting */

ADCCON3 = 0;

ADCCON3bits.ADCSEL = 0; // Select input clock source

ADCCON3bits.CONCLKDIV = 1; // Control clock frequency is half of input clock

ADCCON3bits.VREFSEL = 0; // Select AVDD and AVSS as reference source

/* No selection for dedicated ADC modules, no presync trigger, not sync sampling */

ADCTRGMODE = 0;

/* Select ADC input mode */

ADCIMCON2bits.SIGN21 = 1; // signed data format

ADCIMCON2bits.DIFF21 = 0; // Single ended mode

/* Configure ADCGIRQENx */

ADCGIRQEN1 = 0; // No interrupts are used.

ADCGIRQEN2 = 0;

/* Configure ADCCSSx */

ADCCSS1 = 0; // No scanning is used

ADCCSS2 = 0;

ADCCSS1bits.CSS21 = 1; // AN21 (Class 3) set for CVD

/* Configure ADCCMPCONx */

ADCCMP1 = 0; // Clear the register

ADCCMP1bits.DCMPHI = 1600; // High limit, depends on touch pad layout and selected

// cap, sample time etc.

ADCCMP1bits.DCMPLO = 0; // Low limit, not very important for sensing touch event

ADCCMPCON1bits.IEHIHI = 1; // When touched, the CVDDATA > HI_LIMIT(DCMPHI)

Section 22. 12-bit High-Speed SAR ADC

Example 22-7: ADC CVD Mode (Continued)

ADCCMPCON1bits.IEBTWN = 0;

ADCCMPCON1bits.IEHILO = 0;

ADCCMPCON1bits.IELOHI = 0;

ADCCMPCON1bits.IELOLO = 0;

ADCCMPCON1bits.DCMPGIEN = 1; // enable interrupt

ADCCMPCON1bits.ENDCMP = 1; // enable comparator

ADCCMPEN1 = 0; // Clear all enable bits, as it is irrelevant in CVD mode

ADCCMPCON2 = 0;

ADCCMPCON3 = 0;

ADCCMPCON4 = 0;

ADCCMPCON5 = 0;

ADCCMPCON6 = 0;

/* Configure ADCFLTRx */

ADCFLTR1 = 0; // No oversampling filters are used.

ADCFLTR2 = 0;

ADCFLTR3 = 0;

ADCFLTR4 = 0;

ADCFLTR5 = 0;

ADCFLTR6 = 0;

/* Set up the trigger sources */

ADCTRGSNS = 0;

ADCTRG1 = 0;

ADCTRG2 = 0;

ADCTRG3 = 0;

/* Early interrupt */

ADCEIEN1 = 0; // No early interrupt

ADCEIEN2 = 0;

/* Turn the ADC on */

ADCCON1bits.ON = 1;

/* Wait for voltage reference to be stable */

while(!ADCCON2bits.BGVRRDY); // Wait until the reference voltage is ready

while(ADCCON2bits.REFFLT); // Wait if there is a fault with the reference voltage

/* Enable clock to analog circuit */

ADCANCONbits.ANEN7 = 1; // Enable the clock to analog bias

/* Wait for ADC to be ready */

while(!ADCANCONbits.WKRDY7); // Wait until the ADC7 is ready

/* Enable interrupt setting for digital comparator 1 */

IFS1bits.ADCDC1IF = 0;

IEC1bits.ADCDC1IE = 1;

IPC11bits.ADCDC1IP = 3;

IPC11bits.ADCDC1IS = 3;

INTCONbits.MVEC = 1;

__builtin_enable_interrupts();

/* Enable the ADC module */

ADCCON3bits.DIGEN7 = 1; // Enable ADC7

/* Turn the CVD mode on */

ADCCON1bits.CVDEN = 1;

while (1);

return (1);

}

PIC32 Family Reference Manual

22.5.6 Double Fast Turbo Channel

In certain applications, the user may require to achieve a data throughput from the ADC that is

higher than what can be possible from a single dedicated ADC module. In such a case, the Turbo

mode can be used, which interleaves two dedicated ADC modules. By interleaving two dedicated

modules, one ADC module would be sampling, while the other ADC module would be converting.

Therefore, the throughput could be increased to a double rate.

22.5.6.1 CONFIGURING TURBO CHANNEL

The Turbo mode consists of two dedicated ADC modules, called master and slave, which are

selected by the TRBMST<2:0> bits (ADCCON1<29:27>) and the TRBSLV<2:0> bits

(ADCCON1<26:24>), respectively. When the master ADC module is triggered by selection of the

TRGSRCx<4:0> bits (ADCTRGx), the master ADC completes the sampling time and undergoes

conversion. At the same time, the master ADC triggers the slave in the middle of (t

SAMC

+ t

CONV

which begins its sampling. The discrete steps, which follow, explain Turbo mode operation:

1. Master ADC receives trigger from external source (selected by TRGSRCx<4:0>).

2. Master ADC goes to Sampling mode.

3. After sampling, conversion begins. Also, master ADC triggers the slave ADC in the middle

of (t

SAMC

+ t

CONV

). Therefore, the slave ADC enters Sampling mode.

4. While master ADC is converting data, the slave ADC completes sampling and starts

conversion.

5. Master ADC ends conversion and the slave ADC also ends conversion after some time.

Overall, at the end of conversion, the data is available at a much higher rate, as compared to data

rate from a single channel.

At the end of conversion, the output data goes to two separate data buffers (ADCDATAx)

associated with the analog inputs of each dedicated ADC module or to a FIFO or system RAM.

22.5.6.2 TURBO CHANNEL ERROR

There are several configuration conditions that must be met before the turbo channel can

function. If turbo channel is not configured appropriately, the turbo channel error bit, TRBERR

(ADCCON1<30>), is set by hardware. When the TRBERR bit (ADCCON1<30>) is set, the

hardware will disable the functioning of the turbo channel despite the fact the user code had set

the TRBEN bit (ADCCON1<31>) to ‘1’. The turbo channel error makes sure that the user

chooses the right setup for the turbo channel. The following conditions must be matched for

proper turbo channel operation; otherwise, the TRBERR bit will be set by hardware:

• ADC module clock divisor: The ADCDIV<6:0> bits (ADCxTIME<22:16>) of master and

slave ADC modules should be the same

• ADC resolution: The SELRES<1:0> bits (ADCxTIME<25:24>) of master and slave ADC

modules should be same. Also, 6-bit resolution (SELRES<1:0> = 00) is not supported in

Turbo mode. Therefore, the value of the SELRES<1:0> bits should be other than ‘00’.

• Sampling time: The SAMC<9:0> bits (ADCxTIME<9:0>) of master and slave ADC modules

should be same

• The STRGEN bit (ADCTRGMODE) for both master and slave ADC modules should be set

• The SSAMPEN bit (ADCTRGMODE) for both master and slave ADC modules should be

set

Note: Even if two dedicated ADC modules are configured as master and slave, they still

maintain their separate analog input pins and it is the user responsibility to short

these two inputs (or two and two if in differential mode) at the application board level

to present the same input signal to both master and slave for sampling and

conversion.

Section 22. 12-bit High-Speed SAR ADC

22.5.6.3 EFFECTIVENESS OF TURBO CHANNEL

Turbo channel will only be effective if, the sample time (t

SAMC

) is less than the conversion time

CONV

). This means that one ADC module will finish sampling before the other ADC module

finishes conversion. Otherwise, both ADC modules will end up sampling at the same time, which

defeats the purpose of turbo channel. For a single SAR ADC, the ADC conversion time is the

time in which no output data is produced. Using the turbo channel, the conversion time is

interleaved with sampling of other channel.

The sample time of ADC depends on the input resistance of analog source. To reduce the sample

time, the input resistance of analog source should be reduced.

If the user is presented with an application where (t

SAMC

) is greater than the conversion time

CONV

) (as then the source impedance cannot be reduced any further due to design constraints

or productized hardware etc.), the clock frequency can be reduced by increasing the

ADCDIV<6:0> bits (ADCxTIME<22:16>) in such a way that the conversion time (counts * T

) is

the same as the sampling time (not counts). Please note that the counts for the sampling time

SAMC<9:0> bits (ADCxTIME<9:0>) should be made smaller due to the reduced clock frequency.

If the sampling time is very large compared to the fastest conversion time (14 * T

) supported,

the turbo channel will not achieve a significant increase in conversion bandwidth. When this

occurs, it is better to run in single channel mode at the fastest conversion rate supported by the

hardware.

Figure 22-24 illustrates the operation of turbo channel mode with the master trigger in edge and

level sensitivity mode.

Figure 22-24: Turbo Mode Operation

While in Interrupt mode, the user application should enable the AGIENx bit of the analog inputs

associated with both the master and slave ADC modules.

Edge Triggered mode

Master

Trigger

Master

Sample

Slave

Trigger

Master triggers slave

at mid-point of sample

and conversion

Master triggers slave

at mid-point of sample

and conversion

Slave

Sample

Level Triggered mode

Master

Trigger

Master

Sample

Master

Conversion

Master triggers slave

at mid-point of sample

and conversion

Master triggers slave

at mid-point of sample

and conversion

Slave

Trigger

End of Master

conversion retriggers

master sample

PIC32 Family Reference Manual

22.6 INTERRUPTS

Each ADC module supports interrupts triggered from a variety of sources, which can be

processed individually or globally. An early interrupt feature is also available to compensate for

interrupt servicing latency.

After an enabled interrupt is generated, the CPU will jump to the vector assigned to that interrupt.

The CPU will then begin executing code at the vector address. The user software at this vector

address should perform the required operations, such as processing the data results, clearing

the interrupt flag, and then exit. For more information on interrupts and the vector address table

details, refer to the Section 8. “Interrupts” (DS60001108) in the “PIC32 Family Reference

Manual” and the “Interrupt Controller” chapter in the specific device data sheet.

22.6.1 Interrupt Sources

Each ADC is capable of generating interrupts from the events listed in Table 22-8.

Table 22-8: ADC Interrupt Sources

Interrupt Event Description Interrupt Enable bit Interrupt Status bit

ANx Data Ready

Event

Interrupt is generated upon a completion of a

conversion from an analog input source

(ANx). Each of the ARDYx bits is capable of

generating a unique interrupt when set, using

the ADCBASE register.

AGIENx of ADCGIRQEN1 or

ADCGIRQEN2 register

ARDYx of ADCDSTATx

Digital Comparator

Event

When a conversion's comparison criteria are

met by a configured and enabled digital com-

parator. Each of the digital comparators is

capable of generating a unique interrupt when

its DCMPED bit is set

DCMPGIEN of

ADCCMPCONx register

DCMPED of

ADCCMPCONx

Oversampling Filter

Data Ready Event

When an oversampling filter has completed

the accumulation/decimation process and has

stored the result.

AFGIEN of ADCFLTRx

AFRDY of

ADCFLTRx register

Both Band Gap Volt-

age and ADC Refer-

ence Voltage Ready

Event

Interrupt is generated when both band gap

voltage and ADC reference voltage are ready.

BGVRIEN of ADCCON2

BGVRRDY of ADCCON2

Band Gap Fault/

Reference Voltage

Fault/AV

Brown-out

Fault Event

Interrupt is generated when Band Gap

Fault/Reference Voltage Fault/AV

Brown-out occurs.

REFFLTIEN of ADCCON2

REFFLT of ADCCON2

End of Scan Event Interrupt is generated when all the selected

inputs have completed scan

EOSIEN of ADCCON2

EOSRDY of ADCCON2

FIFO Data Ready

Event

Interrupt is generated when data is ready to be

read from FIFO.

FIEN of ADCFSTAT register FRDY of ADCFSTAT

DMA Buffer B Full

Event

Interrupt is generated when DMA Buffer B is

full.

RBFIEN6:RBFIEN0 of

ADCDMASTAT register

RBF6:RBF0 of

ADCDMASTAT register

DMA Buffer A Full

Event

Interrupt is generated when DMA Buffer A is

full.

RAFIEN6:RAFIEN0 of

ADCDMASTAT register

RAF6:RAF0 of

ADCDMASTAT register

ADC Module Wake-up

Event

Interrupt is generated when ADC wakes up

after being enabled.

WKIEN6:WKIEN0, WKIEN7

of ADCANCON register

WKRDY6:WKRDY0,

WKRDY7 of ADCANCON

Update Ready Event Interrupt is generated when ADC SFRs are

ready to be (and can be safely) updated with

new values.

UPDIEN of ADCCON3

UPDRDY of ADCCON3

Early Interrupt Event Interrupt is generated earlier than certain ADC

clocks (prior to end-of-conversion) as set by

ADCEIS<2:0> bits (ADCxTIME<28:26>) and

ADCEIS<2:0> bits (ADCCON2<10:8>).

EIEN6:EIEN0 of ADCEIENx

EIRDY6:EIRDY0 of

ADCEISTATx register

Section 22. 12-bit High-Speed SAR ADC

22.6.2 ADC Base Register (ADCBASE) Usage

After conversion of ADC is complete, if the interrupt is vectored to a function which is common to

all analog inputs, it takes some significant time to find the ADC input by evaluating the ARDYx

bits in the ADCDSTATx. To avoid this time spent, ADCBASE register is provided, which contains

the base address of the user’s ADC ISR jump table. When read, the ADCBASE register will

provide a sum of the contents of the ADCBASE register plus an encoding of the ARDYx bits set

in the ADCDSTATx registers. This use of the ADCBASE register supports the creation of an

interrupt vector address that can be used to improve the performance of an ISR.

The ARDYx bits are binary priority encoded with ARDY0 being the highest priority, and A63RDY

being the lowest priority. The encoded priority result is then shifted left the amount specified by

the number of bit positions specified by the IRQVS<2:0> bits in the ADCCON1 register, and then

added to the contents of the ADCBASE register. If there are no ARDYx bits set, then reading the

ADCBASE register will equal the value written into the ADCBASE register.

The ADCBASE register will typically be loaded with the base address of a jump table that will

contain the address of appropriate ISR. The k

interrupt request is enabled via the AGIENx bit

(0 x  63) in one of ADCGIRQENx SFRs (‘x’ = 1 or 2).

Example 22-8 shows the usage of ADCBASE register. In addition, the code in Example 22-9

shows how to use the ADCBASE register for vectoring interrupts for different ADC inputs.

Example 22-8: ADCBASE Register Usage

Note: The contents of the ADCBASE register are not altered. Summation is performed

when ADCBASE register is read and the summation result is the returned read

value from the ADCBASE SFR.

Case 1:

ADCBASE = 0x1234; // Set the address

ADCCON1bits.IRQVS = 2; // left shift by 2

ADCGIRQEN1bits.AGIEN0 = 1; // enable interrupt when AN0 completion is done.

Once the ADC conversion for AN0 is complete, bit 0 of ADCDSTAT1 = ARDY0 is set.

Read value of ADCBASE = 0x1234 + (0 << 2) = 0x1234.

Therefore, the ISR should be placed at address 0x1234 for AN0.

Case 2:

ADCBASE = 0x1234; // Set the address

ADCCON1bits.IRQVS = 2; // left shift by 2

ADCGIRQEN1bits.AGIEN0 = 2; // enable interrupt when AN2 completion is done.

Once the ADC conversion for AN2 is complete, bit 2 of ADCDSTAT1 = ARDY2 is set.

Read value of ADCBASE = 0x1234 + (2 << 2) = 0x123C.

Therefore, the ISR should be placed at address 0x123C for AN2.

PIC32 Family Reference Manual

Example 22-9: Vectoring Interrupts for Different ADC Inputs

/* Number of ADC modules doing conversion */

#defineADC_MODULES3

/* Declare functions for each ADC handler */

void ADC0Handler(void);

void ADC1Handler(void);

void ADC2Handler(void);

void(*jumpTable[ADC_MODULES * 2])(void);

int ADC0Result;

int ADC1Result;

int ADC2Result;

int main(int argc, char** argv) {

jumpTable[0] = &ADC0Handler; // Set up jump table

jumpTable[2] = &ADC1Handler;

jumpTable[4] = &ADC2Handler;

/* Configure ADCCON1 */

ADCCON1 = 0; // No ADCCON1 features are enabled including: Stop-in-Idle, turbo,

// CVD mode, Fractional mode and scan trigger source.

/* Configure ADCCON2 */

ADCCON2 = 0; // Since, we are using only the Class 1 inputs, no setting is

// required for ADCDIV

/* Initialize warm up time register */

ADCANCON = 0;

ADCANCONbits.WKUPCLKCNT = 5; // Wakeup exponent = 32 * TADx

/* Clock setting */

ADCCON3 = 0;

ADCCON3bits.ADCSEL = 0; // Select input clock source

ADCCON3bits.CONCLKDIV = 1; // Control clock frequency is half of input clock

ADCCON3bits.VREFSEL = 0; // Select AVDD and AVSS as reference source

/* Select ADC sample time and conversion clock */

ADC0TIMEbits.ADCDIV = 1; // ADC0 clock frequency is half of control clock = TAD0

ADC0TIMEbits.SAMC = 5; // ADC0 sampling time = 5 * TAD0

ADC0TIMEbits.SELRES = 3; // ADC0 resolution is 12 bits

ADC1TIMEbits.ADCDIV = 1; // ADC1 clock frequency is half of control clock = TAD1

ADC1TIMEbits.SAMC = 5; // ADC1 sampling time = 5 * TAD1

ADC1TIMEbits.SELRES = 3; // ADC1 resolution is 12 bits

ADC2TIMEbits.ADCDIV = 1; // ADC2 clock frequency is half of control clock = TAD2

ADC2TIMEbits.SAMC = 5; // ADC2 sampling time = 5 * TAD2

ADC2TIMEbits.SELRES = 3; // ADC2 resolution is 12 bits

/* Select analog input for ADC modules, no presync trigger, not sync sampling */

ADCTRGMODEbits.SH0ALT = 0; // ADC0 = AN0

ADCTRGMODEbits.SH1ALT = 0; // ADC1 = AN1

ADCTRGMODEbits.SH2ALT = 0; // ADC2 = AN2

/* Select ADC input mode */

ADCIMCON1bits.SIGN0 = 0; // unsigned data format

ADCIMCON1bits.DIFF0 = 0; // Single ended mode

ADCIMCON1bits.SIGN1 = 0; // unsigned data format

ADCIMCON1bits.DIFF1 = 0; // Single ended mode

ADCIMCON1bits.SIGN2 = 0; // unsigned data format

ADCIMCON1bits.DIFF2 = 0; // Single ended mode

/* Configure ADCGIRQENx */

ADCGIRQEN1 = 0;

ADCGIRQEN2 = 0;

ADCGIRQEN1bits.AGIEN0 = 1; // Enable data ready interrupt for AN0

ADCGIRQEN1bits.AGIEN1 = 1; // Enable data ready interrupt for AN1

ADCGIRQEN1bits.AGIEN2 = 1; // Enable data ready interrupt for AN2

/* Configure ADBASE */

ADCBASE = (int)(&jumpTable[0]); // Initialize ADCBASE with starting address of jump table

ADCCON1bits.IRQVS = 0; // No left shift of address

/* Configure ADCCSSx */

ADCCSS1 = 0; // No scanning is used

ADCCSS2 = 0;

Section 22. 12-bit High-Speed SAR ADC

Example 22-9: Vectoring Interrupts for Different ADC Inputs (Continued)

/* Configure ADCCMPCONx */

ADCCMPCON1 = 0; // No digital comparators are used. Setting the ADCCMPCONx

ADCCMPCON2 = 0; // register to '0' ensures that the comparator is disabled.

ADCCMPCON3 = 0; // Other registers are “don't care”.

ADCCMPCON4 = 0;

ADCCMPCON5 = 0;

ADCCMPCON6 = 0;

/* Configure ADCFLTRx */

ADCFLTR1 = 0; // No oversampling filters are used.

ADCFLTR2 = 0;

ADCFLTR3 = 0;

ADCFLTR4 = 0;

ADCFLTR5 = 0;

ADCFLTR6 = 0;

/* Set up the trigger sources */

ADCTRGSNSbits.LVL0 = 0; // Edge trigger

ADCTRGSNSbits.LVL1 = 0; // Edge trigger

ADCTRGSNSbits.LVL2 = 0; // Edge trigger

ADCTRG1bits.TRGSRC0 = 1; // Set AN0 to trigger from software.

ADCTRG1bits.TRGSRC1 = 1; // Set AN1 to trigger from software.

ADCTRG1bits.TRGSRC2 = 1; // Set AN2 to trigger from software.

/* Early interrupt */

ADCEIEN1 = 0; // No early interrupt

ADCEIEN2 = 0;

ADCCON2bits.ADCEIOVR = 1; // Override early interrupt

/* Turn the ADC on */

ADCCON1bits.ON = 1;

/* Wait for voltage reference to be stable */

while(!ADCCON2bits.BGVRRDY); // Wait until the reference voltage is ready

while(ADCCON2bits.REFFLT); // Wait if there is a fault with the reference voltage

/* Enable clock to analog circuit */

ADCANCONbits.ANEN0 = 1; // Enable the clock to analog bias and digital control

ADCANCONbits.ANEN1 = 1; // Enable the clock to analog bias and digital control

ADCANCONbits.ANEN2 = 1; // Enable the clock to analog bias and digital control

/* Wait for ADC to be ready */

while(!ADCANCONbits.WKRDY0); // Wait until ADC0 is ready

while(!ADCANCONbits.WKRDY1); // Wait until ADC1 is ready

while(!ADCANCONbits.WKRDY2); // Wait until ADC2 is ready

/* Enable the ADC module */

ADCCON3bits.DIGEN0 = 1; // Enable ADC0

ADCCON3bits.DIGEN1 = 1; // Enable ADC1

ADCCON3bits.DIGEN2 = 1; // Enable ADC2

/* Trigger a conversion */

ADCCON3bits.GSWTRG = 1;

while (1);

return (1);

}

/* Handler for the ADC interrupt */

void __ISR(_ADC_VECTOR, ipl3) ADCHandler1(void)

{

/* call the corresponding ADC module handler */

((void(*)())*((int *)ADCBASE))();

}

void ADC0Handler(void)

{

/* Verify if data for AN0 is ready. This bit is self cleared upon data read */

if(ADCDSTAT1bits.ARDY0)

{

ADC0Result = ADCDATA0;

}

PIC32 Family Reference Manual

Example 22-9: Vectoring Interrupts for Different ADC Inputs (Continued)

22.6.3 Interrupt Enabling, Priority and Vectoring

Each of the ADC events previously mentioned will generate an interrupt when its associate

Interrupt Enable bit, IE, is set. An Interrupt Flag bit, IF, priority bits, IP<2:0>, and sub-priority bits

IS<1:0> are also associated with each of the events. For more information on how to enable and

prioritize interrupts, refer to Section 8. “Interrupts” (DS60001108). Each of the ADC events

previously listed also has an associated interrupt vector. Refer to the “Interrupt Controller”

chapter in the specific device data sheet for more information on the vector location and

control/status bits associated with each individual interrupt.

22.6.4 Individual and Global Interrupts

The use of the individual interrupts previously listed can significantly optimize the servicing of

multiple ADC events, by keeping each ISR focused on efficiently handling a specific event. In

addition, different ISRs can be easily segregated according to the tasks performed, thereby

making user software easier to implement and maintain. There may be cases where it is

desirable to have a single ISR service multiple interrupt events. To facilitate this, each ADC event

can be logically “ORed” to create a single global ADC interrupt. When an ADC event is enabled

for a global interrupt, it will vector to a single interrupt routine. It will be the responsibility of this

single global ISR to determine the source of the interrupt through polling and process it

accordingly.

Use of the Global Interrupt requires configuration of its own unique IE, IF, IP and IS bits as well

as configuration of its interrupt vector as described in 22.6.3 “Interrupt Enabling, Priority and

Vectoring”.

Interrupts for the ADC can be configured as individual or global, or utilize both where some are

processed individually and others in the global ISR.

void ADC1Handler(void)

{

/* Verify if data for AN1 is ready. This bit is self cleared upon data read */

if(ADCDSTAT1bits.ARDY1)

{

ADC1Result = ADCDATA1;

}

void ADC2Handler(void)

{

/* Verify if data for AN2 is ready. This bit is self cleared upon data read */

if(ADCDSTAT2bits.ARDY2)

{

ADC2Result = ADCDATA2;

}

Section 22. 12-bit High-Speed SAR ADC

22.6.5 Early Interrupts

The early interrupt feature lets ADC module generate interrupt before the conversion is complete.

Even though the input is still in the conversion process, the processor application software can

use the “head-start” to begin execution of the entry into the ISR. The early interrupt can improve

the throughput of a system by overlapping the completion of the ADC conversion with the

processor overhead associated with an interrupt. The ADCEIS<2:0> bits (ADCxTIME<28:26>)

and ADCEIS<2:0> bits (ADCCON2<10:8>) sets the number of ADC clock prior to which, the

interrupt should occur (for dedicated and shared inputs respectively). Suitably configuring these

bits can reduce the latency from the moment the analog signal was sampled until the point in time

when the user application software can use the data.

Once the set number of ADC clocks reached prior to end-of-conversion (i.e., prior to data actually

being available in the ADCDATAx register), the corresponding early interrupt ready bit, EIRDYx,

in the ADCEISTAT1 or ADCEISTAT2 register is set. If the respective interrupt enable bit, EIENx,

in the ADCEIEN1 or ADCEIEN2 register is set, the interrupt will be generated.

The early interrupt feature can be overridden by setting the Early Interrupt Override bit,

ADCEIOVR (ADCCON2<12>). Once this bit is set, setting the bits in the ADCEIEN1 or

ADCEIEN2 register has no effect on interrupt generation. The interrupt generation is then

controlled by the setting of ADCGIRQEN1 and ADCGIRQEN2 registers.

Note: The ADCEIS<2:0> bits setting does not apply to the Oversampling Filter Data

Ready signal, AFRDY.

PIC32 Family Reference Manual

22.7 OPERATION DURING POWER-SAVING MODES

The power-saving modes, Sleep and Idle, are useful for reducing the conversion noise by

minimizing the digital activity of the CPU, buses and other peripherals.

22.7.1 Sleep Mode

When device enters Sleep mode, the system clock (SYCCLK) is halted. If an ADC module

selects SYSCLK as its clock source or selects REFCLK3 as its clock source (REFCLK3 is

generated from SYSCLK), the ADC will enter the Sleep mode.

When the SYSCLK is the source, (directly or indirectly) and Sleep mode occurs during a

conversion, the conversion is aborted. The converter will not resume a partially completed

conversion on exiting from Sleep mode. The ADC register contents are not affected by the device

entering or leaving Sleep mode. The ADC module can operate during Sleep mode if the ADC

clock source is derived from a source other than SYSCLK that is active during Sleep mode. The

FRC clock source is a logical choice for operation during Sleep; however, the REFCLK3 clock

source can also be used, provided it has an input clock that is operational during Sleep mode.

ADC operation during Sleep mode reduces the digital switching noise from the conversion. When

the conversion is completed, the ARDYx status bit for that analog input will be set and the result

will be loaded into the corresponding ADC Result register (ADCDATAx).

If any of the ADC interrupts is enabled, the device will wake-up from Sleep mode when the ADC

interrupt occurs. The program execution will resume at the ADC ISR, if the ADC interrupt is

greater than the current CPU priority. Otherwise, execution will continue from the instruction after

the WAIT instruction that placed the device in Sleep mode.

To minimize the effects of digital noise on the ADC module operation, the user must select a

conversion trigger source that ensures that the analog-to-digital conversion will take place in

Sleep mode. For example, the external interrupt pin (INT0) conversion trigger option

(TRGSRC<4:0> = 00100) can be used for performing sampling and conversion while the device

is in Sleep mode.

22.7.2 ADC Operation During Idle Mode

For the ADC, the Stop in Idle Mode bit, SIDL (ADCCON1<13>), specifies whether the ADC

module will stop on Idle or continue on Idle. If SIDL = , the ADC module will continue normal0

operation when the device enters Idle mode. If any of the ADC interrupts are enabled, the device

will wake-up from Idle mode when the ADC interrupt occurs. The program execution will resume

at the ADC ISR if the ADC interrupt is greater than the current CPU priority. Otherwise, execution

will continue from the instruction after the WAIT instruction that placed the device in Idle mode.

If SIDL = 1, the ADC module will stop in Idle mode. If the device enters Idle mode during a

conversion, the conversion is aborted. The converter will not resume a partially completed

conversion on exiting from Idle mode.

Note: For the ADC module to operate in Sleep mode, the ADC clock source must be set

to Internal FRC (ADCSEL<1:0> bits (ADCCON2<31:30>) = 01). Alternately, the

REFCLK3 source can be used; however, the clock source used for REFCLK3 must

operate during Sleep. Any changes to the ADC clock configuration require that the

ADC be disabled.

Section 22. 12-bit High-Speed SAR ADC

22.7.3 ADC Low-power Mode

The ADC module can be placed in a low-power state by disabling the digital circuit for individual

ADC modules, which are not running. This is possible by clearing the DIGENx bits and the

DIGEN7 bit in the ADCCON3 register (see Register 22-3).

An even lower power state is possible by disabling the analog and bias circuit for individual ADC

modules, which are not running. This is possible by clearing the ANENx bits and the ANEN7 bit

in the ADCANCON register (see Register 22-41). Disabling the digital circuit to achieve

Low-power mode provides a significantly faster module restart compared to disabling and

re-enabling the analog and bias circuit of the ADC module. This is because disabling and

re-enabling the analog and bias circuit using the ANENx bits and the ANEN7 bit requires a

wake-up time (typical minimum wake-up time of 20 µs) for the ADC module, before it can be

used. Refer to the “Electrical Characteristics” chapter in the specific device data sheet for

more information on the stabilization time.

Once the analog and bias circuit for an ADC module is enabled, the wake-up should be polled

(or through an interrupt) using the wake-up ready bits, WKRDY6:WKRDY0 and WKRDY7, which

should be equal to ‘1’.

PIC32 Family Reference Manual

22.8 EFFECTS OF RESET

Following any Reset event, all the ADC control and status registers are reset to their default

values with control bits in a non-active state. This disables the ADC module and sets the analog

input pins to Analog Input mode. Any conversion that was in progress will terminate and the result

will not be written to the result buffer. The values in the ADCDATAx registers are initialized to

0x00000000 during a device Reset. The bias circuits are also turned off, so the ADC resuming

operations will have to wait for the bias circuits to stabilize by polling (or requesting to be

interrupted by) the BGVRRDY bit (ADCCON2 register).

22.9 TRANSFER FUNCTION

A typical transfer function of the 12-bit ADC is illustrated in Figure 22-25. The difference of the

input voltages (V

INH

- V

INL

) is compared with the reference (V

REFH

- V

REFL

• The first code transition (A) occurs when the input voltage is (V

REFH

- V

REFL

/8192) or 0.5 LSb

• The 00 0000 0001 code is centered at (V

REFH

- V

REFL

/4096) or 1.0 LSb (B)

• The 10 0000 0000 code is centered at (2048 * (V

REFH

- V

REFL

)/4096) (C)

• An input voltage less than (1 * (V

REFH

- V

REFL

)/8192) converts as 00 0000 0000 (D)

• An input greater than (8192 * (V

REFH

- V

REFL

)/8192) converts as 11 1111 1111 (E)

Figure 22-25: Analog-to-Digital Transfer Function

1000 0000 0001 (= 2049)

1000 0000 0010 (= 2050)

1000 0000 0011 (= 2051)

0111 1111 1101 (= 2045)

0111 1111 1110 (= 2046)

0111 1111 1111 (= 2047)

1111 1111 1110 (= 4094)

1111 1111 1111 (= 4095)

0000 0000 0000 (= 0)

0000 0000 0001 (= 1)

Output Code

1000 0000 0000 (= 2048)

INH

– V

INL

)

REFL

REFH

– V

REFL

4096

2048 * (V

REFH

– V

REFL

)

4096

REFH

REFL

+ V

REFL

(A)

(B)

(C)

(D)

(E)

Section 22. 12-bit High-Speed SAR ADC

22.10 ADC SAMPLING REQUIREMENTS

The analog input model of the 12-bit ADC is illustrated in Figure 22-26. The total acquisition time

for the analog-to-digital conversion is a function of the internal circuit settling time and the holding

capacitor charge time.

For the ADC module to meet its specified accuracy, the charge holding capacitor (CHOLD) must

be allowed to fully charge to the voltage level on the analog input pin. The analog output source

impedance (R

), the interconnect impedance (R

), and the internal sampling switch (R

)

impedance combine to directly affect the time required to charge the CHOLD. The combined

impedance of the analog sources must therefore be small enough to fully charge (to within

one-fourth LSB of the desired voltage) the holding capacitor within the selected sample time. The

internal holding capacitor will be in the discharged state prior to each sample operation.

At least 1 T

time period should be allowed between conversions for the acquisition time. Refer

to the “Electrical Characteristics” chapter in the specific device data sheet for more

information.

Figure 22-26: 12-bit ADC Analog Input Model

22.11 CONNECTION CONSIDERATIONS

Because the analog inputs employ Electrostatic Discharge (ESD) protection, they have diodes

to V

and V

; therefore, the analog input must be between V

and V

. The presence of

diodes is the reason why the analog pins cannot be 5V tolerant. If the input voltage exceeds this

range by greater than 0.3V (either direction), one of the diodes becomes forward biased and it

may damage the device if the input current specification exceeds.

An external RC filter is sometimes added for anti-aliasing of the input signal. The R (resistive)

component should be selected to ensure that the acquisition time is met. Any external

components connected (through high-impedance) to an analog input pin (capacitor, Zener diode,

and so on) should have very little leakage current at the pin.

Rs ANx V

= 0.6V

= 0.6V I

LEAKAGE

= 200Sampling

Switch

HOLD

= DAC capacitance

= 5 pF

± 500 nA

Note: The C

value depends on the device package and is not tested. The effect of the C

negligible if Rs  5 k.

= 44 

Legend:

= Input capacitance V

= Threshold voltage

= Sampling switch resistance R

= Interconnect resistance

= Source resistance C

HOLD

= Sample/hold capacitance

LEAKAGE

= Leakage current at the pin due to various junctions

PIC32 Family Reference Manual

22.12 RELATED APPLICATION NOTES

This section lists application notes that are related to this section of the manual. These

application notes may not be written specifically for the PIC32 device family, but the concepts are

pertinent and could be used with modification and possible limitations. The current application

notes related to the 12-bit High-Speed Successive Approximation Register (SAR)

Analog-to-Digital Converter (ADC) module are:

Title Application Note #

No related application notes at this time. N/A

Note: Please visit the Microchip web site (www.microchip.com) for additional application

notes and code examples for the PIC32 family of devices.

Section 22. 12-bit High-Speed SAR ADC

22.13 REVISION HISTORY

Revision A (June 2015)

This is the initial released version of the document.

Revision B (April 2016)

This revision includes the following updates:

• The ADINSEL<5:0> bits in the ADCCON3 register were updated (see Register 22-7)

• The DFMODE bit in the ADCFLTRx register was updated (see Register 22-17)

•Figure 22-18: “ADC Filter Comparisons Example” was added

• The ADC CVD Mode code example was updated (see Example 22-7)

• Minor updates to text and formatting were incorporated throughout the document

Revision C (September 2017)

This revision includes the following updates:

• Section 22.4.11 “Only-the-fly Update of SFRs” was removed.

• Minor updates to text and formatting were incorporated throughout the document

Revision D (November 2017)

This revision includes the following updates:

• The bit values for the ADC Clock Source (T

CLK

) bits, ADCSEL<1:0> (ADCCON3<31:30>),

were removed and a referral to the specific device data sheet for the ADC clock source

selections was added (see Register 22-3)

• The Sample and Conversion Time equations were updated (see Equation 22-1 and

Equation 22-2)

Revision E (September 2019)

This revision includes the following updates:

• Added missing mathematical symbols in Equation 22-1 and Equation 22-2

• Removed ADC6CFG configuration in Example 22-1

PIC32 Family Reference Manual

NOTES:

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	PIC32MZ0512EFE064

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