DSPIC33FJ32GP302THSLASHSP datasheet(141/403 Pages) MICROCHIP

141 / 403 page

 2009 Microchip Technology Inc.

Preliminary

DS70292D-page 141

dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/X04

9.0

OSCILLATOR CONFIGURATION

The dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/

X04, and dsPIC33FJ128GPX02/X04 oscillator system

provides:

• External and internal oscillator options as clock

sources

• An on-chip Phase-Locked Loop (PLL) to scale the

internal operating frequency to the required sys-

tem 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)

• Non-volatile Configuration bits for main oscillator

selection

• An auxiliary crystal oscillator for Audio DAC

A simplified diagram of the oscillator system is shown

in Figure 9-1.

FIGURE 9-1:

dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/

X04 OSCILLATOR SYSTEM DIAGRAM

Note 1: This data sheet summarizes the features

the

dsPIC33FJ32GP302/304,

dsPIC33FJ64GPX02/X04,

and

dsPIC33FJ128GPX02/X04

families

devices. It is not intended to be a compre-

hensive reference source. To comple-

ment the information in this data sheet,

refer to “Section 39. Oscillator (Part

III)” (DS70216) of the “dsPIC33F/PIC24H

Family Reference Manual”, which is avail-

able

from

the

Microchip

website

(www.microchip.com).

2: Some registers

and

associated bits

described in this section may not be avail-

able 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

Timer1

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

FCY

FOSC

Note

See Figure 9-2 for PLL details.

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

 must be connected.

÷N

ACLK

POSCCLK

Auxiliary Oscillator

SELACK

APSTSCLR<2:0>

DAC

FVCO(1)

AOSCCLK

AOSCMD<1:0>

ASRCSEL

FVCO(1)

POSCCLK

OSC2

OSC1

Primary Oscillator

R(2)

POSCMD<1:0>

DSPIC33FJ32GP302TH/SP Datasheet(PDF) 141 Page - Microchip Technology

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