PIC16F722-ESLASHP datasheet(89/302 Pages) MICROCHIP

89 / 302 page

DS41341E-page 89

PIC16F72X/PIC16LF72X

7.0

OSCILLATOR MODULE

7.1

Overview

The oscillator module has a wide variety of clock sources

and selection features that allow it to be used in a wide

range of applications while maximizing performance and

minimizing power consumption. Figure 7-1 illustrates a

block diagram of the oscillator module.

Clock sources can be configured from external

oscillators, quartz crystal resonators, ceramic resonators

and Resistor-Capacitor (RC) circuits. In addition, the

system can be configured to use an internal calibrated

high-frequency oscillator as clock source, with a choice

of selectable speeds via software.

Clock source modes are configured by the FOSC bits

in Configuration Word 1 (CONFIG1). The oscillator

module can be configured for one of eight modes of

operation.

RC – External Resistor-Capacitor (RC) with

FOSC/4 output on OSC2/CLKOUT.

RCIO – External Resistor-Capacitor (RC) with

I/O on OSC2/CLKOUT.

INTOSC – Internal oscillator with FOSC/4 output

on OSC2 and I/O on OSC1/CLKIN.

INTOSCIO – Internal oscillator with I/O on

OSC1/CLKIN and OSC2/CLKOUT.

EC – External clock with I/O on OSC2/CLKOUT.

HS – High Gain Crystal or Ceramic Resonator

mode.

–

Medium

Gain

Crystal

Ceramic

Resonator Oscillator mode.

LP – Low-Power Crystal mode.

FIGURE 7-1:

SIMPLIFIED PIC® MCU CLOCK SOURCE BLOCK DIAGRAM

(CPU and Peripherals)

OSC1

OSC2

Sleep

External Oscillator

LP, XT, HS, RC, EC

System Clock

16 MHz/500 kHz

8 MHz/250 kHz

4 MHz/125 kHz

2 MHz/62.5 kHz

IRCF<1:0>

FOSC<2:0>

(Configuration Word 1)

Internal Oscillator

(OSCCON Register)

500 kHz

INTOSC

32x

PLL

PLLEN

(Configuration Word 1)

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