PIC16F720-ESLASHML datasheet(67/244 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS41430A-page 67

PIC16F/LF720/721

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.

EC – CLKOUT function on RA4/CLKOUT pin,

CLKIN on RA5/CLKIN.

EC – I/O function on RA4/CLKOUT pin, CLKIN

on RA5/CLKIN.

INTOSC – CLKOUT function on RA4/CLKOUT

pin, I/O function on RA5/CLKIN

INTOSCIO – I/O function on RA4/CLKOUT pin,

I/O function on RA5/CLKIN

FIGURE 7-1:

SIMPLIFIED PIC® MCU CLOCK SOURCE BLOCK DIAGRAM

(CPU and Peripherals)

CLKIN

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)

MFINTOSC

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