PIC18F010T datasheet(9/176 Pages) MICROCHIP

9 / 176 page

 2001 Microchip Technology Inc.

Preliminary

DS41142A-page 7

PIC18F010/020

2.0

OSCILLATOR

CONFIGURATIONS

2.1

Oscillator Types

The PIC18F010/020 can be operated in eight different

oscillator modes. Programming these modes is done

via the CONFIG1H register (FOSC2, FOSC1, and

FOSC0).

Low Power Crystal

Crystal/Resonator

High Speed Crystal/Resonator

External Clock

External Resistor/Capacitor

RCIO

External Resistor/Capacitor with

I/O pin enabled

INTOSC

Precision Internal Oscillator

INTOSCIO Precision Internal Oscillator with

I/O pin enabled

2.2

Crystal Oscillator/Ceramic

Resonators

In XT, LP, or HS oscillator modes, a crystal or ceramic

resonator is connected to the RB5/OSC1 and RB4/

OSC2 pins to establish oscillation. Figure 2-1 shows the

pin connections. An external clock source may also be

connected to the OSC1 pin in these modes, as shown in

Figure 2-2.

The PIC18F010/020 oscillator design requires the use

of a parallel cut crystal.

FIGURE 2-1:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP

OSC CONFIGURATION)

FIGURE 2-2:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR

LP OSC CONFIGURATION)

Note:

Use of a series cut crystal may give a fre-

quency out of the crystal manufacturers

specifications.

Note 1:

See Table 2-1 and Table 2-2 for recom-

mended values of C1 and C2.

2: A series resistor (RS) may be required for AT

strip cut crystals.

3: RF varies with the crystal chosen.

C1(1)

C2(1)

XTAL

OSC2

OSC1

RF(3)

SLEEP

logic

RS(2)

internal

RB5/OSC1

RB4/OSC2

Open

Clock from

ext. system

PIC18F010/020

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