PIC16C74B datasheet(86/184 Pages) MICROCHIP

86 / 184 page

PIC16C63A/65B/73B/74B

DS30605C-page 86

 2000 Microchip Technology Inc.

13.2

Oscillator Configurations

13.2.1

OSCILLATOR TYPES

The PIC16CXX can be operated in four different oscil-

lator 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

13.2.2

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

establish

oscillation

(Figure 13-1).

The

PIC16CXX oscillator design requires the use of a par-

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

frequency out of the crystal manufacturers specifica-

tions. When in XT, LP or HS modes, the device can

have an external clock source to drive the OSC1/

CLKIN pin (Figure 13-2). See the PICmicro™ Mid-

Range MCU Reference Manual (DS33023) for details

on building an external oscillator.

FIGURE 13-1:

CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP

OSC CONFIGURATION)

FIGURE 13-2:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR

LP OSC CONFIGURATION)

XTAL

OSC2

(Note 1)

OSC1

SLEEP

To internal

logic

PIC16CXX

See Table 13-1 and Table 13-2 for recommended values of C1

and C2.

Note 1: A series resistor may be required for AT strip cut crystals.

OSC1

OSC2

Open

Clock from

ext. system

PIC16CXX

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