PIC18F6X2X datasheet(26/386 Pages) MICROCHIP

26 / 386 page

PIC18F6X2X/8X2X

DS39612A-page 24

Advance Information

 2003 Microchip Technology Inc.

2.6

Oscillator Switching Feature

The PIC18F6X2X/8X2X devices include a feature that

allows the system clock source to be switched from the

main oscillator to an alternate low frequency clock

source. For the PIC18F6X2X/8X2X devices, this

alternate clock source is the Timer1 oscillator. If a low

frequency crystal (32 kHz, for example) has been

attached to the Timer1 oscillator pins and the Timer1

oscillator has been enabled, the device can switch to a

Low Power Execution mode. Figure 2-7 shows a block

diagram of the system clock sources. The clock

switching feature is enabled by programming the

Oscillator Switching Enable (OSCSEN) bit in the

CONFIG1H Configuration register to a ‘0’. Clock

switching is disabled in an erased device. See

Section 12.0 for further details of the Timer1 oscillator.

See Section 24.0 for Configuration register details.

FIGURE 2-7:

DEVICE CLOCK SOURCES

PIC18F6X2X/8X2X

TOSC

4 x PLL

TT1P

TSCLK

Clock

Source

TOSC/4

Timer1 Oscillator

T1OSCEN

Enable

Oscillator

T1OSO

T1OSI

Clock Source Option

for Other Modules

OSC1

OSC2

SLEEP

Main Oscillator

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