PIC18F44J10-ISLASHML datasheet(29/368 Pages) MICROCHIP

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DS39682E-page 27

PIC18F45J10 FAMILY

3.0

OSCILLATOR

CONFIGURATIONS

3.1

Oscillator Types

The PIC18F45J10 family of devices can be operated in

five different oscillator modes:

High-Speed Crystal/Resonator

HSPLL High-Speed Crystal/Resonator

with Software PLL Control

External Clock with FOSC/4 Output

ECPLL External Clock with Software PLL

Control

INTRC Internal 31 kHz Oscillator

Four of these are selected by the user by programming

the FOSC<2:0> Configuration bits. The fifth mode

(INTRC) may be invoked under software control; it can

also be configured as the default mode on device

Resets.

3.2

Crystal Oscillator/Ceramic

Resonators (HS Modes)

In HS or HSPLL Oscillator modes, a crystal or ceramic

resonator is connected to the OSC1 and OSC2 pins to

establish oscillation. Figure 3-1 shows the pin

connections.

The oscillator design requires the use of a parallel cut

crystal.

FIGURE 3-1:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS OR HSPLL

CONFIGURATION)

TABLE 3-1:

CAPACITOR SELECTION FOR

CERAMIC RESONATORS

Note:

Use of a series cut crystal may give a fre-

quency out of the crystal manufacturer’s

specifications.

Typical Capacitor Values Used:

Mode

Freq.

OSC1

OSC2

8.0 MHz

16.0 MHz

27 pF

22 pF

27 pF

22 pF

Capacitor values are for design guidance only.

These capacitors were tested with the resonators

listed below for basic start-up and operation. These

values are not optimized

Different capacitor values may be required to produce

acceptable oscillator operation. The user should test

the performance of the oscillator over the expected

VDD and temperature range for the application.

See the notes following Table 3-2 for additional

information.

Resonators Used:

4.0 MHz

8.0 MHz

16.0 MHz

Note 1:

See Table 3-1 and Table 3-2 for initial values of

C1 and C2.

A series resistor (RS) may be required for AT

strip cut crystals.

RF varies with the oscillator mode chosen.

C1(1)

C2(1)

XTAL

OSC2

OSC1

RF(3)

Sleep

Logic

PIC18F45J10

RS(2)

Internal

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