PIC18C601 datasheet(21/320 Pages) MICROCHIP

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 2001 Microchip Technology Inc.

Advance Information

DS39541A-page 21

PIC18C601/801

2.0

OSCILLATOR

CONFIGURATIONS

2.1

Oscillator Types

PIC18C601/801 can be operated in one of four oscilla-

tor

modes,

programmable

configuration

bits

FOSC1:FOSC0 in CONFIG1H register:

Low Power Crystal

High Speed Crystal/Resonator

External Resistor/Capacitor

External Clock

2.2

Crystal Oscillator/Ceramic

Resonators

In LP or HS oscillator modes, a crystal or ceramic res-

onator is connected to the OSC1 and OSC2 pins to

establish oscillation. Figure 2-1 shows the pin connec-

tions. An external clock source may also be connected

to the OSC1 pin, as shown in Figure 2-3 and Figure 2-4.

PIC18C601/801 oscillator design requires the use of a

parallel cut crystal.

FIGURE 2-1:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS OR LP OSC

CONFIGURATION)

Note:

Use of a series cut crystal may give a fre-

quency out of the crystal manufacturer’s

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

PIC18C601/801

RS(2)

Internal

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