PIC16F688
11.1 Configuration Bits
Note:
Address 2007h is beyond the user program
memory space. It belongs to the special
configuration memory space (2000h-
3FFFh), which can be accessed only during
programming. See “PIC12F6XX/16F6XX
Memory Programming Specification”
(DS41204) for more information.
The configuration bits can be programmed (read as
‘0’), or left unprogrammed (read as ‘1’) to select various
device configurations as shown in Register 11-1.
These bits are mapped in program memory location
2007h.
REGISTER 11-1: CONFIG – CONFIGURATION WORD (ADDRESS: 2007h)
—
—
FCMEN IESO BODEN1 BODEN0 CPD
CP
MCLRE PWRTE WDTE FOSC2 FOSC1 FOSC0
bit 0
bit 13
bit 13-12
bit 11
Unimplemented: Read as ‘1’
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
(1)
bit 9-8
BODEN<1:0>: Brown-out Detect Selection bits
11= BOD enabled
10= BOD enabled during operation and disabled in Sleep
01= BOD controlled by SBODEN bit (PCON<4>)
00= BOD disabled
(2)
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
CPD: Data Code Protection bit
1= Data memory code protection is disabled
0= Data memory code protection is enabled
(3)
CP: Code Protection bit
1= Program memory code protection is disabled
0= Program memory code protection is enabled
(4)
MCLRE: RA3/MCLR pin function select bit
1= RA3/MCLR pin function is MCLR
0= RA3/MCLR pin function is digital input, MCLR internally tied to VDD
PWRTE: Power-up Timer Enable bit
1= PWRT disabled
0= PWRT enabled
WDTE: Watchdog Timer Enable bit
1= WDT enabled
0= WDT disabled and can be enabled by SWDTEN bit (WDTCON<0>)
FOSC<2:0>: Oscillator Selection bits
111= RC oscillator: CLKOUT function on RA4/OSC2/CLKOUT pin, RC on RA5/OSC1/CLKIN
110= RCIO oscillator: I/O function on RA4/OSC2/CLKOUT pin, RC on RA5/OSC1/CLKIN
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 Detect 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.
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
DS41203B-page 100
Preliminary
2004 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
