PIC16F628A datasheet(96/168 Pages) MICROCHIP

96 / 168 page

PIC16F627A/628A/648A

DS40044A-page 94

Preliminary

 2002 Microchip Technology Inc.

CONFIGURATION WORD

—

CPD

LVP

BOREN

MCLRE

FOSC2

PWRTE

WDTE

F0SC1

F0SC0

bit 13

bit 0

bit 13:

CP: FLASH Program Memory Code Protection bit(2)

(PIC16F648A)

= Code protection off

= 0000h to 0FFFh code protected

(PIC16F628A)

= Code protection off

= 0000h to 07FFh code protected

(PIC16F627A)

= Code protection off

= 0000h to 03FFh code protected

bit 12-9:

Unimplemented: Read as ‘0’

bit 8:

CPD: Data Code Protection bit(3)

1 = Data memory code protection off

0 = Data memory code protected

bit 7:

LVP: Low Voltage Programming Enable

1 = RB4/PGM pin has PGM function, low voltage programming enabled

0 = RB4/PGM is digital I/O, HV on MCLR must be used for programming

bit 6:

BOREN: Brown-out Reset Enable bit (1)

1 = BOR Reset enabled

0 = BOR Reset disabled

bit 5:

MCLRE: RA5/MCLR pin function select

1 = RA5/MCLR pin function is MCLR

0 = RA5/MCLR pin function is digital Input, MCLR internally tied to VDD

bit 3:

PWRTEN: Power-up Timer Enable bit (1)

1 = PWRT disabled

0 = PWRT enabled

bit 2:

WDTEN: Watchdog Timer Enable bit

1 = WDT enabled

0 = WDT disabled

bit 4, 1-0:

FOSC2:FOSC0: Oscillator Selection bits(4)

111 = RC oscillator: CLKOUT function on RA6/OSC2/CLKOUT pin, Resistor and Capacitor on RA7/OSC1/CLKIN

110 = RC oscillator: I/O function on RA6/OSC2/CLKOUT pin, Resistor and Capacitor on RA7/OSC1/CLKIN

101 = INTOSC oscillator: CLKOUT function on RA6/OSC2/CLKOUT pin, I/O function on RA7/OSC1/CLKIN

100 = INTOSC oscillator: I/O function on RA6/OSC2/CLKOUT pin, I/O function on RA7/OSC1/CLKIN

011 = EC: I/O function on RA6/OSC2/CLKOUT pin, CLKIN on RA7/OSC1/CLKIN

010 = HS oscillator: High speed crystal/resonator on RA6/OSC2/CLKOUT and RA7/OSC1/CLKIN

001 = XT oscillator: Crystal/resonator on RA6/OSC2/CLKOUT and RA7/OSC1/CLKIN

000 = LP oscillator: Low power crystal on RA6/OSC2/CLKOUT and RA7/OSC1/CLKIN

Note

Enabling Brown-out Reset does not automatically enable the Power-up Timer (PWRT) the way it did in the PIC16F627/628.

The code protection scheme has changed from the code protection scheme used in the PIC16F627/628. The entire FLASH program

memory needs to be bulk erased to set the CP bit, turning the code protection off. See Programming Specification DS41196 for details.

The entire data EEPROM needs to be bulk erased to set the CPD bit, turning the code protection off. See Programming Specification

DS41196 for details.

When MCLR is asserted in INTOSC mode, the internal clock oscillator is disabled.

Legend

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

1 = bit is set

0 = bit is cleared

x = bit is unknown

PIC16F628A Datasheet(PDF) 96 Page - Microchip Technology

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