Datasheet

PIC18F2331/2431/4331/4431
DS39616D-page 264  2010 Microchip Technology Inc.
TABLE 23-1: CONFIGURATION BITS AND DEVICE IDs
File Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Default/
Unprogrammed
Value
300000h CONFIG1L
— — — — — — — — ---- ----
300001h CONFIG1H IESO FCMEN
— — FOSC3 FOSC2 FOSC1 FOSC0 11-- 1111
300002h CONFIG2L
— — — — BORV1 BORV0 BOREN PWRTEN ---- 1111
300003h CONFIG2H
— —WINENWDTPS3 WDTPS2 WDTPS1 WDTPS0 WDTEN --11 1111
300004h CONFIG3L
— —T1OSCMX HPOL LPOL PWMPIN — — --11 11--
300005h CONFIG3H MCLRE
(1)
— —EXCLKMX
(1)
PWM4MX
(1)
SSPMX
(1)
—FLTAMX
(1)
1--1 11-1
300006h CONFIG4L DEBUG
— — — —LVP—STVREN1--- -1-1
300007h CONFIG4H
— — — — — — — — ---- ----
300008h CONFIG5L
— — — —CP3
(1)
CP2
(1)
CP1 CP0 ---- 1111
300009h CONFIG5H CPD CPB
— — — — — — 11-- ----
30000Ah CONFIG6L
— — — —WRT3
(1)
WRT2
(1)
WRT1 WRT0 ---- 1111
30000Bh CONFIG6H WRTD WRTB WRTC
— — — — — 111- ----
30000Ch CONFIG7L
— — — — EBTR3
(1)
EBTR2
(1)
EBTR1 EBTR0 ---- 1111
30000Dh CONFIG7H
—EBTRB — — — — — — -1-- ----
3FFFFEh DEVID1
(2)
DEV2 DEV1 DEV0 REV4 REV3 REV2 REV1 REV0 xxxx xxxx
(2)
3FFFFFh DEVID2
(2)
DEV10 DEV9 DEV8 DEV7 DEV6 DEV5 DEV4 DEV3 0000 0101
Legend: x = unknown, u = unchanged, - = unimplemented. Shaded cells are unimplemented, read as ‘0’.
Note 1: Unimplemented in PIC18F2331/4331 devices; maintain this bit set.
2: See Register 23-13 for DEVID1 values. DEVID registers are read-only and cannot be programmed by the user.
REGISTER 23-1: CONFIG1H: CONFIGURATION REGISTER 1 HIGH (BYTE ADDRESS 300001h)
R/P-1 R/P-1 U-0 U-0 R/P-1 R/P-1 R/P-1 R/P-1
IESO FCMEN
— — FOSC3 FOSC2 FOSC1 FOSC0
bit 7 bit 0
Legend:
R = Readable bit P = Programmable bit U = Unimplemented bit, read as ‘0’
-n = Value when device is unprogrammed U = Unchanged from programmed state
bit 7 IESO: Internal External Switchover bit
1 = Internal External Switchover mode enabled
0 = Internal External Switchover mode disabled
bit 6 FCMEN: Fail-Safe Clock Monitor Enable bit
1 = Fail-Safe Clock Monitor enabled
0 = Fail-Safe Clock Monitor disabled
bit 5-4 Unimplemented: Read as ‘0’
bit 3-0 FOSC<3:0>: Oscillator Selection bits
11xx = External RC oscillator, CLKO function on RA6
1001 = Internal oscillator block, CLKO function on RA6 and port function on RA7 (INTIO1)
1000 = Internal oscillator block, port function on RA6 and port function on RA7 (INTIO2)
0111 = External RC oscillator, port function on RA6
0110 = HS oscillator, PLL enabled (clock frequency = 4 x FOSC1)
0101 = EC oscillator, port function on RA6 (ECIO)
0100 = EC oscillator, CLKO function on RA6 (EC)
0010 = HS oscillator
0001 = XT oscillator
0000 = LP oscillator