PIC18LC658 datasheet(21/366 Pages) MICROCHIP

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Advanced Information

DS30475A-page 21

PIC18CXX8

2.0

OSCILLATOR

CONFIGURATIONS

2.1

Oscillator Types

The PIC18CXX8 can be operated in one of eight oscil-

lator modes, programmable by three configuration bits

(FOSC2, FOSC1, and FOSC0).

Low Power Crystal

Crystal/Resonator

High Speed Crystal/Resonator

HS4

High Speed Crystal/Resonator with

PLL enabled

External Resistor/Capacitor

RCIO

External Resistor/Capacitor with I/O

pin enabled

External Clock

ECIO

External Clock with I/O pin enabled

2.2

Crystal Oscillator/Ceramic

Resonators

In XT, LP, HS or HS4 (PLL) oscillator modes, a crystal

or ceramic resonator is connected to the OSC1 and

OSC2 pins to establish oscillation. Figure 2-1 shows

the pin connections. An external clock source may also

be connected to the OSC1 pin, as shown in Figure 2-3

and Figure 2-4.

The PIC18CXX8 oscillator design requires the use of a

parallel cut crystal.

FIGURE 2-1:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT 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

(3)

SLEEP

logic

PIC18CXX8

RS(2)

internal

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