PIC16C774T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C774T-I/SO

28/40-Pin, 8-Bit CMOS Microcontrollers w/ 12-Bit A/D

Microchip Technology 

PIC16C77X

FIGURE 12-1: CONFIGURATION WORD

CP1 CP0 BORV1 BORV0 CP1 CP0

bit13 12 11

10

9

8

- BODEN CP1 CP0 PWRTE WDTE FOSC1 FOSC0 Register: CONFIG

Address

2007h

7

6

5

4

3

2

1

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:

bit 6:

bit 3:

Unimplemented, Read as '1'

BODEN: Brown-out Reset Enable bit (1)

1 = Brown-out Reset enabled

0 = Brown-out Reset disabled

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:

2:

3:

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.

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

• XT

Low Power Crystal

Crystal/Resonator

• HS

• RC

High Speed Crystal/Resonator

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 to 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).

DS30275B-page 128

Advance Information

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