PIC16F877A-I/P【PDF 53/234 页】IC MCU FLASH 8KX14 EE 40DIP

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PIC16F87XA

DS39582B-page 144

2003 Microchip Technology Inc.

REGISTER 14-1:

CONFIGURATION WORD (ADDRESS 2007h)(1)

R/P-1

U-0

R/P-1

R/P-1 R/P-1

R/P-1

U-0

R/P-1

—

DEBUG WRT1 WRT0

CPD

LVP

BOREN

—

—PWRTEN WDTEN FOSC1FOSC0

bit 13

bit0

bit 13

CP: Flash Program Memory Code Protection bit

= Code protection off

= All program memory code-protected

bit 12

Unimplemented: Read as ‘1’

bit 11

DEBUG: In-Circuit Debugger Mode bit

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

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

bit 10-9

WRT1:WRT0 Flash Program Memory Write Enable bits

For PIC16F876A/877A:

= Write protection off; all program memory may be written to by EECON control

= 0000h to 00FFh write-protected; 0100h to 1FFFh may be written to by EECON control

= 0000h to 07FFh write-protected; 0800h to 1FFFh may be written to by EECON control

= 0000h to 0FFFh write-protected; 1000h to 1FFFh may be written to by EECON control

For PIC16F873A/874A:

= Write protection off; all program memory may be written to by EECON control

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

= 0000h to 03FFh write-protected; 0400h to 0FFFh may be written to by EECON control

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

bit 8

CPD: Data EEPROM Memory Code Protection bit

= Data EEPROM code protection off

= Data EEPROM code-protected

bit 7

LVP: Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit

= RB3/PGM pin has PGM function; low-voltage programming enabled

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

bit 6

BOREN: Brown-out Reset Enable bit

= BOR enabled

= BOR disabled

bit 5-4

Unimplemented: Read as ‘1’

bit 3

PWRTEN: Power-up Timer Enable bit

= PWRT disabled

= PWRT enabled

bit 2

WDTEN: Watchdog Timer Enable bit

= WDT enabled

= WDT disabled

bit 1-0

FOSC1:FOSC0: Oscillator Selection bits

= RC oscillator

= HS oscillator

= XT oscillator

= LP oscillator

Legend:

R = Readable bit

P = Programmable bit

U = Unimplemented bit, read as ‘0’

- n = Value when device is unprogrammed

u = Unchanged from programmed state

Note 1: The erased (unprogrammed) value of the Configuration Word is 3FFFh.

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