DSPIC33FJ64GP706 datasheet(139/322 Pages) MICROCHIP

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DS70286C-page 137

dsPIC33FJXXXGPX06/X08/X10

9.0

OSCILLATOR

CONFIGURATION

The dsPIC33FJXXXGPX06/X08/X10 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

• A Clock 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:

dsPIC33FJXXXGPX06/X08/X10 OSCILLATOR SYSTEM DIAGRAM

Note:

This data sheet summarizes the features

of the dsPIC33FJXXXGPX06/X08/X10

family of devices. However, it is not

intended to be a comprehensive reference

source. To complement the information in

this data sheet, refer to Section 7.

“Oscillator” (DS70186) in the “dsPIC33F

Family Reference Manual”, which is

available from the Microchip web site

(www.microchip.com).

dsPIC33F

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.

OSC2

OSC1

Primary Oscillator

R(2)

POSCMD<1:0>

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