Microchip PIC24EP512MC206 Handleiding

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Oscillator Module

HIGHLIGHTS

This section of the manual contains the following major topics:

1.0 Introduction ....................................................................................................................... 2

2.0 CPU Clocking.................................................................................................................... 5

3.0 Oscillator Configuration Registers .................................................................................... 6

4.0 Special Function Registers ............................................................................................... 9

5.0 Primary Oscillator (POSC).............................................................................................. 21

6.0 Internal Fast RC (FRC) Oscillator................................................................................... 25

7.0 Phase-Locked Loop (PLL) .............................................................................................. 26

8.0 Secondary Oscillator (SOSC) ......................................................................................... 31

9.0 Low-Power RC (LPRC) Oscillator................................................................................... 32

10.0 Auxiliary Oscillator .......................................................................................................... 33

11.0 Auxiliary Phase-Locked Loop (APLL) ............................................................................. 34

12.0 Auxiliary PLL (x16).......................................................................................................... 37

13.0 Fail-Safe Clock Monitor (FSCM)..................................................................................... 39

14.0 Clock Switching............................................................................................................... 40

15.0 Two-Speed Start-up ........................................................................................................ 44

16.0 Reference Clock Output.................................................................................................. 44

17.0 Linear Feedback Shift Register....................................................................................... 44

18.0 Register Maps................................................................................................................. 45

19.0 Related Application Notes............................................................................................... 46

20.0 Revision History.............................................................................................................. 47

dsPIC33/PIC24 Family Reference Manual

1.0 INTRODUCTION

The dsPIC33/PIC24 family oscillator system includes these characteristics:

• External and internal oscillator sources

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

and external oscillator sources

• Auxiliary PLL (APLL) clock generator to boost operating frequency for ADC and PWM

• Auxiliary Oscillator (AOSC) and Auxiliary PLL Clock (ACLK) generator for USB

• Doze mode for system power savings

• Scalable Reference Clock Output (REFCLKO)

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

• Linear Feedback Shift Register (LFSR) to generate pseudorandom data

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

recovery or shutdown

A block diagram of the dsPIC33/PIC24 family oscillator system is shown in Figure 1-1.

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

data sheets. This document applies to all dsPIC33/PIC24 family devices. However,

some features in this document will not apply to all devices.

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

Oscillator Module

Figure 1-1: Oscillator System Block Diagram

XTPLL, HSPLL,

XT, HS, EC

FRCDIV<2:0>

WDT, PWRT,

FRCDIVN

FRCDIV16

ECPLL, FRCPLL (F

PLLO

)

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

Reset

FRC

Oscillator

LPRC

Oscillator

DOZE<2:0>

S1/S3

FRC

LPRC

÷ 16

Clock Switch

0b000

Clock Fail

TUN<5:0>

PLL(1) FCY(3)

FOSC

FRCDIV

DOZE

Note 1: See Figure 7-1 for the source of the FVCO 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 term, FP, refers to the clock source for all the peripherals, while FCY (or MIPS) refers to the clock source for the CPU.

Throughout this document, FCY and FP are used interchangeably, except in the case of Doze mode. FP and FCY will be different when

Doze mode is used in any ratio other than 1:1.

FSCM

POSCCLK

FRCCLK

FVCO(1)

OSC2

OSC1

Primary Oscillator (POSC)

R(2)

POSCMD<1:0>

FP(3)

REFERENCE CLOCK OUTPUT

POSCCLK

ROSEL

FOSC

÷ N

RPn

REFCLKO

RODIV<3:0>

SOSCO

Secondary Oscillator (SOSC)

POSCMD<1:0>

LPOSCEN

SOSCI

Auxiliary

Oscillator (AOSC)

ENAPLL

To Auxiliary Clock Generator

SOSC

÷ 2

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	PIC24EP512MC206

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