Datasheet

PIC12F635/PIC16F636/639
DS41232D-page 130 © 2007 Microchip Technology Inc.
REGISTER 12-1: CONFIG: CONFIGURATION WORD REGISTER
— — —
WURE
FCMEN IESO BOREN1 BOREN0
bit 15 bit 8
CPD
CP MCLRE PWRTE WDTE FOSC2 FOSC1 FOSC0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit P = Programmable’ U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-13 Unimplemented: Read as ‘1’
bit 12 WURE
: Wake-up Reset Enable bit
1 = Standard wake-up and continue enabled
0 = Wake-up and Reset enabled
bit 11 FCMEN: Fail-Safe Clock Monitor Enabled bit
1 = Fail-Safe Clock Monitor is enabled
0 = Fail-Safe Clock Monitor is disabled
bit 10 IESO: Internal External Switchover bit
1 = Internal External Switchover mode is enabled
0 = Internal External Switchover mode is disabled
bit 9-8 BOREN<1:0>: Brown-out Reset Selection bits
(1)
11 = BOR enabled, SBOREN bit disabled
10 = BOR enabled during operation and disabled in Sleep, SBOREN bit disabled
01 = BOR controlled by SBOREN bit of the PCON register
00 = BOR and SBOREN bits disabled
bit 7 CPD
: Data Code Protection bit
(2)
1 = Data memory code protection is disabled
0 = Data memory code protection is enabled
bit 6 CP
: Code Protection bit
(3)
1 = Program memory code protection is disabled
0 = Program memory code protection is enabled
bit 5 MCLRE: MCLR
pin function select bit
(4)
1 = MCLR pin function is MCLR
0 = MCLR pin function is digital input, MCLR internally tied to VDD
bit 4 PWRTE: Power-up Timer Enable bit
1 = PWRT disabled
0 = PWRT enabled
bit 3 WDTE: Watchdog Timer Enable bit
1 = WDT enabled
0 = WDT disabled and can be enabled by SWDTEN bit of the WDTCON register
bit 2-0 FOSC<2:0>: Oscillator Selection bits
111 = EXTRC oscillator: External RC on RA5/OSC1/CLKIN, CLKOUT function on RA4/OSC2/CLKOUT pin
110 = EXTRCIO oscillator: External RC on RA5/OSC1/CLKIN, I/O function on RA4/OSC2/CLKOUT pin
101 = INTOSC oscillator: CLKOUT function on RA4/OSC2/CLKOUT pin, I/O function on RA5/OSC1/CLKIN
100 = INTOSCIO oscillator: I/O function on RA4/OSC2/CLKOUT pin, I/O function on RA5/OSC1/CLKIN
011 = EC: I/O function on RA4/OSC2/CLKOUT pin, CLKIN on RA5/OSC1/CLKIN
010 = HS oscillator: High-speed crystal/resonator on RA4/OSC2/CLKOUT and RA5/OSC1/CLKIN
001 = XT oscillator: Crystal/resonator on RA4/OSC2/CLKOUT and RA5/OSC1/CLKIN
000 = LP oscillator: Low-power crystal on RA4/OSC2/CLKOUT and RA5/OSC1/CLKIN
Note 1: Enabling Brown-out Reset does not automatically enable Power-up Timer.
2: The entire data EEPROM will be erased when the code protection is turned off.
3: The entire program memory will be erased when the code protection is turned off.
4: When MCLR
is asserted in INTOSC or RC mode, the internal clock oscillator is disabled.