 2002 Microchip Technology Inc.

DS39607B-page 15

PIC16F87/88

REGISTER 4-1:

CONFIGURATION WORD 1 (2007h) REGISTER

CP

CCPMX DEBUG WRT1

WRT0

CPD

LVP

BOREN MCLRE FOSC2 PWRTEN WDTEN FOSC1 FOSC0

bit 13

bit 0

bit 13

CP:

Flash Program Memory Code Protection bits

1

= Code protection off

0

= 0000h to 0FFFh code protected (all protected)

bit 12

CCPMX: CCP Mux bit

1

= CCP1 function on RB0

0

= CCP1 function on RB3

bit 11

DEBUG: In-Circuit Debugger Mode bit

1

= In-Circuit Debugger disabled, RB6 and RB7 are general purpose I/O pins

0

= In-Circuit Debugger enabled, RB6 and RB7 are dedicated to the debugger

bit 10-9

WRT1:WRT0: Flash Program Memory Write Enable bits

11

= Write protection off

10

= 0000h to 00FFh write-protected, 0100h to 0FFFh may be modified by EECON control

01

= 0000h to 07FFh write-protected, 0800h to 0FFFh may be modified by EECON control

00

= 0000h to 0FFFh write-protected

bit 8

CPD: Data EE Memory Code Protection bit

1

= Code protection off

0

= Data EE memory code-protected

bit 7

LVP: Low-voltage Programming Enable bit

1

= RB3/PGM pin has PGM function, Low-voltage Programming enabled

0

= RB3 is digital I/O, HV on MCLR must be used for programming

bit 6

BOREN: Brown-out Reset Enable bit

1

= BOR enabled

0

= BOR disabled

bit 5

MCLRE: RA5/MCLR Pin Function Select bit

1

= RA5/MCLR pin function is MCLR

0

bit 3

PWRTEN: Power-up Timer Enable bit

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

111

= EXTRC oscillator; CLKO function on RA6/OSC2/CLKO

110

= EXTRC oscillator; port I/O function on RA6/OSC2/CLKO

101

= INTRC oscillator; CLKO function on RA6/OSC2/CLKO

100

= INTRC oscillator; port I/O function on RA6/OSC2/CLKO

011

= EXTCLK; port I/O function on RA6/OSC2/CLKO

010

= HS oscillator

001

= XT oscillator

000

= LP oscillator

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