PIC16LC65B-20E/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LC65B-20E/SP

8-Bit CMOS Microcontrollers with A/D Converter

Microchip Technology 

PIC16C63A/65B/73B/74B

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

• XT

• HS

• RC

Low Power Crystal

Crystal/Resonator

High Speed Crystal/Resonator

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 to 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)

OSC1

C1

XTAL

RF

OSC2

RS

C2 (Note 1)

To internal

logic

SLEEP

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.

FIGURE 13-2:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR

LP OSC CONFIGURATION)

Clock from

ext. system

Open

OSC1

PIC16CXX

OSC2

DS30605C-page 86

 2000 Microchip Technology Inc.

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