PIC12F752 datasheet(39/204 Pages) MICROCHIP

39 / 204 page

 2011 Microchip Technology Inc.

Preliminary

DS41576A-page 39

PIC12F752/HV752

4.0

OSCILLATOR MODULE

4.1

Overview

The oscillator module has a 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 4-1

illustrates a block diagram of the oscillator module.

The oscillator module can be configured in one of two

clock modes.

EC (external clock)

INTOSC (internal oscillator)

Clock Source modes are configured by the FOSC bit in

the Configuration Word register (CONFIG).

The internal oscillator module provides the following

selectable system clock modes:

• 8 MHz (HFINTOSC)

• 4 MHz (HFINTOSC Postscaler)

• 1 MHz (HFINTOSC Postscaler)

• 31 kHz (LFINTOSC)

FIGURE 4-1:

PIC® MCU CLOCK SOURCE BLOCK DIAGRAM

FIGURE 4-2:

OSCILLATOR ENABLE

(CPU and

CLKIN

System Clock

FOSC

Internal Oscillator

HFINTOSC

8 MHz

LFINTOSC

31 kHz

Prescaler

÷1

÷2

÷8

IRCF<1:0>

COG Clock Source

HFINTOSC Enable

(Figure 4-2)

WDT Clock Source

LFINTOSC Enable

(Figure 4-2)

Peripherals)

EC Enable

(Figure 4-2)

FOSC0

Sleep

HFINTOSC Enable

IRCF<1:0>

 00

FOSC0

Sleep

EC Enable

FOSC0

Sleep

LFINTOSC Enable

IRCF<1:0> = 00

WDTE

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