Microchip PIC24EP128MC206 Manual

Microchip Ikke kategoriseret PIC24EP128MC206

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Side 1/44

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

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	PIC24EP128MC206

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