PIC12F615 datasheet(27/168 Pages) MICROCHIP

27 / 168 page

Preliminary

DS41302A-page 25

PIC12F609/615/12HV609/615

3.0

OSCILLATOR MODULE

3.1

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 perfor-

mance and minimizing power consumption. Figure 3-1

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 clock source can be configured with a choice of

two selectable speeds: internal or external system clock

source.

The Oscillator module can be configured in one of eight

clock modes.

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

LP – 32 kHz Low-Power Crystal mode.

XT – Medium Gain Crystal or Ceramic Resonator

Oscillator mode.

HS – High Gain Crystal or Ceramic Resonator

mode.

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.

Clock Source modes are configured by the FOSC<2:0>

bits in the Configuration Word register (CONFIG). The

Internal Oscillator module provides a selectable system

clock mode of either 4 MHz (Postscaler) or 8 MHz

(INTOSC).

FIGURE 3-1:

PIC® MCU CLOCK SOURCE BLOCK DIAGRAM

(CPU and Peripherals)

OSC1

OSC2

Sleep

External Oscillator

LP, XT, HS, RC, RCIO, EC

System Clock

FOSC<2:0>

(Configuration Word Register)

Internal Oscillator

INTOSC

8 MHz

Postscaler

4 MHz

INTOSC

IOSCFS<7>

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