Microchip PIC24EP128MC206 Handleiding

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Oscillator

Section 7. Oscillator

HIGHLIGHTS

This section of the manual contains the following topics:

7.1 Introduction .................................................................................................................... 7-2

7.2 CPU Clocking................................................................................................................. 7-4

7.3 Oscillator Configuration Registers ................................................................................. 7-5

7.4 Special Function Registers ............................................................................................ 7-8

7.5 Primary Oscillator (POSC)............................................................................................. 7-18

7.6 Internal Fast RC (FRC) Oscillator ................................................................................ 7-22

7.7 Phase-Locked Loop (PLL) ........................................................................................... 7-23

7.8 Low-Power Secondary Oscillator (SOSC)..................................................................... 7-28

7.9 Low-Power RC (LPRC) Oscillator................................................................................ 7-29

7.10 Auxiliary Oscillator .......................................................................................................7-30

7.11 Auxiliary Phase-Locked Loop (APLL) .......................................................................... 7-31

7.12 Fail-Safe Clock Monitor (FSCM) .................................................................................. 7-34

7.13 Clock Switching............................................................................................................7-35

7.14 Two-Speed Start-up ..................................................................................................... 7-39

7.15 Register Maps..............................................................................................................7-40

7.16 Related Application Notes............................................................................................ 7-41

7.17 Revision History ...........................................................................................................7-42

dsPIC33E/PIC24E Family Reference Manual

7.1 INTRODUCTION

The dsPIC33E/PIC24E oscillator system includes these characteristics:

• Four external and internal oscillator options

• Auxiliary oscillator that provides clock source to the USB module (not available on all

devices)

• On-chip Phase-Locked Loop (PLL) to boost internal operating frequency on select internal

and external oscillator sources

• On-the-fly clock switching between various clock sources

• Doze mode for system power savings

• Fail-Safe Clock Monitor (FSCM) that detects clock failure and permits safe application

recovery or shutdown

• Nonvolatile Configuration bits for clock source selection

• Scalable Reference Clock Out (REFCLKO) (not available on all devices)

A block diagram of the dsPIC33E/PIC24E oscillator system is shown in Figure 7-1.

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

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

to all dsPIC33E/PIC24E devices.

Please consult the note at the beginning of the “Oscillator” 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

Section 7. Oscillator

Oscillator

Figure 7-1: Oscillator System Block Diagram

Secondary Oscillator (SOSC)

LPOSCEN

SOSCO

SOSCI

Timer1

XTPLL, HSPLL,

XT, HS, EC

FRCDIV<2:0>

WDT, PWRT,

FRCDIVN

SOSC

FRCDIV16

ECPLL, FRCPLL

NOSC<2:0> FNOSC<2:0>

Reset

FRC

Oscillator

LPRC

Oscillator

DOZE<2:0> (1:1 Default)

S1/S3

FRC

LPRC

÷ 16

Clock Switch

Clock Fail

÷ 2

TUN<5:0>

PLL(1) FCY(3)

FOSC

FRCDIV

DOZE

Note 1: See Figure 7-8 for the source of the FOSC signal.

2: If the oscillator is used with XT or HS modes, an external parallel resistor with the value of 1 MΩ must be connected.

3: The terms Fcy and Fp are used interchangeably throughout this document and are equivalent for the default Doze mode 1:1 ratio.

4: This feature is not available on all devices. Refer to the “Oscillator” chapter in the specific device data sheet for availability.

FSCM

ACLK

POSCCLK

Auxiliary

SELACLK

USB

FOSC(1)

ENAPLL

ASRCSEL

ENAPLL

APLL

POSCCLK

FRCCLK

FOSC(1)

÷ N

APLLPOST<1:0>

FRCCLK

FRCSEL

Oscillator (Aosc)

OSC2

OSC1

Primary Oscillator (POSC)

R(2)

POSCMD<1:0>

FP(3)

(See Note 4)

POSCLK

FOSC

÷ N

RODIV<3:0>

ROSEL

REFCLKO

RPn

48 MHz

3.5 MHz ≤ AUX_Fin ≤ 10 MHz

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	PIC24EP128MC206

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