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PIC18C658

High-Performance Microcontrollers with CAN Module

Microchip Technology 

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).

1. LP

2. XT

3. HS

4. HS4

5. RC

6. RCIO

7. EC

8. ECIO

Low Power Crystal

Crystal/Resonator

High Speed Crystal/Resonator

High Speed Crystal/Resonator with

PLL enabled

External Resistor/Capacitor

External Resistor/Capacitor with I/O

pin enabled

External Clock

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.

Note:

Use of a series cut crystal may give a fre-

quency out of the crystal manufacturer’s

specifications.

PIC18CXX8

FIGURE 2-1:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP

OSC CONFIGURATION)

C1(1)

OSC1

XTAL

RF(3)

To

internal

logic

RS(2)

C2(1)

OSC2

SLEEP

PIC18CXX8

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.

 2000 Microchip Technology Inc.

Advanced Information

DS30475A-page 21

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