PIC24HJ12GP201ESLASHML datasheet(79/234 Pages) MICROCHIP

79 / 234 page

Preliminary

DS70282B-page 77

PIC24HJ12GP201/202

7.0

OSCILLATOR

CONFIGURATION

The PIC24HJ12GP201/202 oscillator system provides:

• External and internal oscillator options as clock

sources

• An on-chip PLL to scale the internal operating

frequency to the required system clock frequency

• An internal FRC oscillator that can also be used

with the PLL, thereby allowing full-speed

operation without any external clock generation

hardware

• Clock switching between various clock sources

• Programmable clock postscaler for system power

savings

• A Fail-Safe Clock Monitor (FSCM) that detects

clock failure and takes fail-safe measures

• A Clock Control register (OSCCON)

• Nonvolatile Configuration bits for main oscillator

selection.

A simplified diagram of the oscillator system is shown

in Figure 7-1.

FIGURE 7-1:

PIC24HJ12GP201/202 OSCILLATOR SYSTEM DIAGRAM

Note:

This data sheet summarizes the features

of the PIC24HJ12GP201/202 devices. It is

not intended to be a comprehensive

reference source. To complement the

information in this data sheet, refer to the

“PIC24H Family Reference Manual”.

Please see the Microchip web site

(www.microchip.com)

for

the

latest

PIC24H

Family

Reference

Manual

chapters.

PIC24H

Secondary Oscillator

LPOSCEN

SOSCO

SOSCI

Timer 1

OSCI

OSCO

Primary Oscillator

XTPLL, HSPLL,

XT, HS, EC

FRCDIV<2:0>

WDT, PWRT,

FSCM

FRCDIVN

SOSC

FRCDIV16

ECPLL, FRCPLL

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

Reset

FRC

Oscillator

LPRC

Oscillator

DOZE<2:0>

S1/S3

FRC

LPRC

÷16

Clock Switch

Clock Fail

÷ 2

TUN<5:0>

PLL(1)

FCY

FOSC

Note 1: See Figure 7-2 for PLL details

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