DSPIC33FJMC302ESS datasheet(101/330 Pages) MICROCHIP

101 / 330 page

DS70283K-page 101

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304

8.0

OSCILLATOR

CONFIGURATION

The oscillator system for dsPIC33FJ32MC202/204 and

dsPIC33FJ16MC304 devices 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

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 8-1.

FIGURE 8-1:

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304 OSCILLATOR SYSTEM DIAGRAM

Note 1: This data sheet summarizes the features

of the dsPIC33FJ32MC202/204 and

dsPIC33FJ16MC304 devices. It is not

intended to be a comprehensive refer-

ence source. To complement the infor-

mation in this data sheet, refer to Section

“Oscillator”

(DS70186)

the

dsPIC33F/PIC24H

Family

Reference

Manual”, which is available from the

Microchip

web

site

(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.

Note 1: See Figure 8-2 for PLL details.

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

Ω must be connected.

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

Throughout this document, FCY and FP are used interchangeably, except in the case of DOZE mode. FP and FCY will

be different when DOZE mode is used with any ratio other than 1:1 which is the default.

Secondary Oscillator (SOSC)

LPOSCEN

SOSCO

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(3)

FOSC

OSC2

OSC1

Primary Oscillator (POSC)

R(2)

POSCMD<1:0>

FP(3)

SOSCI

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