PIC18F010 datasheet(11/176 Pages) MICROCHIP

11 / 176 page

 2001 Microchip Technology Inc.

Preliminary

DS41142A-page 9

PIC18F010/020

2.5

External Clock Input

The EC oscillator mode requires an external clock

source to be connected to the OSC1 pin. The feedback

device between OSC1 and OSC2 is turned off in this

mode to save current. There is no oscillator start-up

time required after a Power-on Reset or after a recov-

ery from SLEEP mode.

In the EC oscillator mode, the oscillator frequency

divided by 4 is available on the OSC2 pin. This signal

may be used for test purposes or to synchronize other

logic. Figure 2-4 shows the pin connections for the EC

oscillator mode.

FIGURE 2-4:

EXTERNAL CLOCK INPUT

OPERATION (EC OSC

CONFIGURATION)

FIGURE 2-5:

PIC18F010/020 OSCILLATOR CONFIGURATION

OSC1

OSC2

FOSC/4

Clock from

ext. system

PIC18F010/020

Configuration bits

OSCOUT

OSCIN

Crystal

Osc

SYSCLK

Ext Osc

and

Divider

IRCF Speed Selects

MUX

OSCTUNE

OSCCAL

Analog

Summation

External Clock In

500kHz

Internal

8MHz

Internal

OSC

32kHz

Internal

OSC

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