 2002 Microchip Technology Inc.

DS39025F-page 13

PIC16F87X

REGISTER 3-1:

CONFIG: CONFIGURATION WORD FOR PIC16F873/874/876/877

(ADDRESS 2007h)

U-0

U-0

U-0

U-0

U-0

U-0

U-0

R/P-1

U-0

R/P-1

R/P-1

R/P-1

R/P-1

R/P-1

CP1

CP0

RESV

—

WRT

CPD

LVP

BODEN

CP1

CP0

PWRTE

WDTE

F0SC1

F0SC0

bit 13

bit 0

bit 13-12

bit 5-4

4 K Devices:

11

= Code protection off

10

= 0F00h to 0FFFh code protected

01

= 0800h to 0FFFh code protected

00

= 0000h to 0FFFh code protected

8 K Devices:

11

= Code protection off

10

= 1F00h to 1FFFh code protected

01

= 1000h to 1FFFh code protected

00

= 0000h to 1FFFh code protected

bit 11

Reserved: Set to ‘1’ for normal operation

bit 10

Unimplemented: Read as ‘1’

bit 9

WRT: FLASH Program Memory Write Enable bit

1

= Unprotected program memory may be written to by EECON control

0

= Unprotected program memory may not be written to by EECON control

bit 8

CPD: Data EE Memory Code Protection bit

1

= Code protection off

0

= Data EE memory code protected

bit 7

LVP: Low Voltage ICSP 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

1

= BOR enabled

0

= BOR disabled

bit 3

PWRTE: Power-up Timer Enable bit

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 Power-up Timer (PWRT), regardless of the value of

bit PWRTE. Ensure the Power-up Timer is enabled any time Brown-out Reset is enabled.

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

Legend:

R = Readable bit

P = Programmable bit

U = Unimplemented bit, read as ‘0’

- n = Value when device is unprogrammed

u = Unchanged from programmed state