PIC16LC773-04SLASHSP datasheet(128/200 Pages) MICROCHIP

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PIC16C77X

DS30275A-page 128

Advance Information

FIGURE 12-1: CONFIGURATION WORD

12.2

Oscillator Configurations

12.2.1

OSCILLATOR TYPES

The PIC16C77X 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

12.2.2

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 12-2).

The

PIC16C77X 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.

A difference from the other mid-range devices may be

noted in that the device can be driven from an external

clock only when configured in HS mode (Figure 12-3).

CP1

CP0 BORV1 BORV0 CP1

CP0

BODEN

CP1

CP0

PWRTE

WDTE

FOSC1

FOSC0

CONFIG

Address

2007h

bit13

bit0

bit 13-12: CP1:CP0: Code Protection bits (2)

bit 9-8:

11 = Program memory code protection off

bit 5-4:

10 = 0800h-0FFFh code protected

01 = 0400h-0FFFh code protected

00 = 0000h-0FFFh code protected

bit 11-10: BORV1:BORV0: Brown-out Reset Voltage bits(3)

11 = VBOR set to 2.5V

10 = VBOR set to 2.7V

01 = VBOR set to 4.2V

00 = VBOR set to 4.5V

bit 7:

Unimplemented, Read as ’1’

bit 6:

BODEN: Brown-out Reset Enable bit (1)

1 = Brown-out Reset enabled

0 = Brown-out Reset disabled

bit 3:

PWRTE: Power-up Timer Enable bit (1)

1 = PWRT disabled

0 = PWRT enabled

bit 2:

WDTE: Watchdog Timer Enable bit

1 = WDT enabled

0 = WDT disabled

bit 1-0:

FOSC1:FOSC0: Oscillator Selection bits

11 = RC oscillator

10 = HS oscillator

01 = XT oscillator

00 = LP oscillator

Note 1:

Enabling Brown-out Reset automatically enables the Power-up Timer (PWRT) regardless of the value of bit PWRTE.

Ensure the Power-up Timer is enabled anytime Brown-out Reset is enabled.

All of the CP1:CP0 pairs have to be given the same value to enable the code protection scheme listed.

These are the minimum trip points for the BOR, see Table 15-4 for the trip point tolerances. Selection of an unused

setting may result in an inadvertant interrupt.

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