PIC16F627A Datasheet, PDF (96/168 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontrollers

PIC16F627A/628A/648A
REGISTER 14-1: CONFIGURATION WORD
CP
—
—
—
—
CPD
LVP BOREN MCLRE FOSC2 PWRTE WDTE F0SC1 F0SC0
bit 13
bit 0
bit 13:
bit 12-9:
bit 8:
CP: FLASH Program Memory Code Protection bit⁽²⁾
(PIC16F648A)
1 = Code protection off
0 = 0000h to 0FFFh code protected
(PIC16F628A)
1 = Code protection off
0 = 0000h to 07FFh code protected
(PIC16F627A)
1 = Code protection off
0 = 0000h to 03FFh code protected
Unimplemented: Read as ‘0’
CPD: Data Code Protection bit⁽³⁾
1 = Data memory code protection off
0 = Data memory code protected
bit 7:
bit 6:
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
BOREN: Brown-out Reset Enable bit ⁽¹⁾
1 = BOR Reset enabled
0 = BOR Reset disabled
bit 5:
bit 3:
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
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 1: Enabling Brown-out Reset does not automatically enable the Power-up Timer (PWRT) the way it did in the PIC16F627/628.
2: 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.
3: 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.
4: When MCLR is asserted in INTOSC mode, the internal clock oscillator is disabled.
Legend
R = Readable bit
-n = Value at POR
W = Writable bit
1 = bit is set
U = Unimplemented bit, read as ‘0’
0 = bit is cleared
x = bit is unknown
DS40044A-page 94
Preliminary
 2002 Microchip Technology Inc.