DSPIC33FJ12MC201TESS datasheet(103/304 Pages) MICROCHIP

103 / 304 page

DS70265E-page 103

dsPIC33FJ12MC201/202

8.0

OSCILLATOR

CONFIGURATION

The

dsPIC33FJ12MC201/202

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

system clock frequency

• An internal FRC oscillator that can also be used

with the PLL, thereby allowing full-speed opera-

tion without any external clock generation hard-

ware

• 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:

dsPIC33FJ12MC201/202 OSCILLATOR SYSTEM DIAGRAM

Note 1:

This data sheet summarizes the features

of the dsPIC33FJ12MC201/202 family of

devices. It is not intended to be a compre-

hensive reference source. To comple-

ment the information in this data sheet,

refer

Section

“Oscillator”

(DS70186) of the “dsPIC33F/PIC24H

Family Reference Manual”

, which is

available from the Microchip website

(www.microchip.com).

Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization”

this data sheet for device-specific register

and bit information.

Note

See Figure 8-2 for PLL details.

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

Ω must be connected.

The term FP refers to the clock source for all 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

a Doze ratio of 1:2 or lower.

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

OSC2

OSC1

Primary Oscillator

R(2)

POSCMD<1:0>

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