70592C datasheet(127/314 Pages) MICROCHIP

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DS70592C-page 127

PIC24HJXXXGPX06A/X08A/X10A

9.0

OSCILLATOR

CONFIGURATION

The

PIC24HJXXXGPX06A/X08A/X10A

oscillator

system provides:

• Various external and internal oscillator options as

clock sources

• An on-chip PLL to scale the internal operating

frequency to the required system clock frequency

• The internal FRC oscillator 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

• An Oscillator Control register (OSCCON)

• Nonvolatile Configuration bits for main oscillator

selection.

A simplified diagram of the oscillator system is shown

in Figure 9-1.

FIGURE 9-1:

PIC24HJXXXGPX06A/X08A/X10A OSCILLATOR SYSTEM DIAGRAM

Note 1: This data sheet summarizes the features

of the PIC24HJXXXGPX06A/X08A/X10A

family of devices. However, it is not

intended

comprehensive

reference source. To complement the

information in this data sheet, refer to

Section 7. “Oscillator” (DS70227) of

the “dsPIC33F/dsPIC33F/PIC24H Family

Reference Manual”, which is available

from

the

Microchip

website

(www.microchip.com).

2: Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization” in

this data sheet for device-specific register

and bit information.

Secondary Oscillator

LPOSCEN

SOSCO

SOSCI

Timer 1

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 9-2 for PLL details.

2: If the Oscillator is used with XT or HS modes, an extended parallel resistor with the value of 1 M

Ω must be connected.

3: The term, FP refers to the clock source for all the peripherals, while FCY refers to the clock source for the CPU. Through-

out this document FP and FCY 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, which is the default.

OSC2

OSC1

Primary Oscillator

R(2)

POSCMD<1:0>

FP(3)

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