PIC16F8X_13 datasheet(39/128 Pages) MICROCHIP

39 / 128 page

PIC16F8X

 1996-2013 Microchip Technology Inc.

DS30430D-page 39

FIGURE 8-2:

CONFIGURATION WORD - PIC16F83 AND PIC16F84

8.2

Oscillator Configurations

8.2.1

OSCILLATOR TYPES

The PIC16F8X can be operated in four different

oscillator

modes.

The

user

can

program

two

configuration bits (FOSC1 and FOSC0) to select one of

these four modes:

• LP

Low Power Crystal

• XT

Crystal/Resonator

• HS

High Speed Crystal/Resonator

• RC

Resistor/Capacitor

8.2.2

CRYSTAL OSCILLATOR / CERAMIC

RESONATORS

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

is connected to the OSC1/CLKIN and OSC2/CLKOUT

pins to establish oscillation (Figure 8-3).

FIGURE 8-3:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP OSC

CONFIGURATION)

The PIC16F8X oscillator design requires the use of a

parallel cut crystal. Use of a series cut crystal may give

frequency

out

the

crystal

manufacturers

specifications. When in XT, LP or HS modes, the device

can have an external clock source to drive the

OSC1/CLKIN pin (Figure 8-4).

R/P-u

R/P-u R/P-u R/P-u R/P-u R/P-u

R/P-u

PWRTE WDTE FOSC1 FOSC0

bit13

bit0

= Readable bit

= Programmable bit

- n = Value at POR reset

u = unchanged

bit 13:4 CP: Code Protection bit

1 = Code protection off

0 = All memory is code protected

bit 3

PWRTE: Power-up Timer Enable bit

1 = Power-up timer is disabled

0 = Power-up timer is enabled

bit 2

WDTE: Watchdog Timer Enable bit

1 = WDT enabled

0 = WDT disabled

bit 1:0

FOSC1:FOSC0: Oscillator Selection bits

= RC oscillator

= HS oscillator

= XT oscillator

= LP oscillator

Note1:

See Table 8-1 for recommended values of

C1 and C2.

A series resistor (RS) may be required for

AT strip cut crystals.

RF varies with the crystal chosen.

C1(1)

C2(1)

XTAL

OSC2

OSC1

RF(3)

SLEEP

logic

PIC16FXX

RS(2)

internal

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