
2009 Microchip Technology Inc.
DS39687E-page 21
PIC18F2XJXX/4XJXX FAMILY
CPDIV<1:0>(3)
CONFIG1H
CPU System Clock Selection bits
11 = No CPU system clock divide
10 = CPU system clock divided by 2
01 = CPU system clock divided by 3
00 = CPU system clock divided by 6
IESO
Two-Speed Start-up (Internal/External Oscillator Switchover) Control bit
1 = Oscillator Switchover mode enabled
0 = Oscillator Switchover mode disabled
FCMEN
Fail-Safe Clock Monitor Enable bit
1 = Fail-Safe Clock Monitor enabled
0 = Fail-Safe Clock Monitor disabled
LPT1OSC
Low-Power Timer1 Oscillator Enable bit
1 = Timer1 oscillator configured for low-power operation
0 = Timer1 oscillator configured for higher power operation
T1DIG
Secondary Clock Source T1OSCEN Enforcement bit(1)
1 = Secondary oscillator clock source may be selected (OSCCON <1:0> = 01)
regardless of T1OSCEN state
0 = Secondary oscillator clock source may not be selected unless T1CON <3> = 1
FOSC<2:0>
Oscillator Selection bits
111 = EC+PLL (S/W controlled by PLLEN bit), CLKO on RA6
110 = EC oscillator (PLL always disabled) with CLKO on RA6
101 = HS+PLL (S/W controlled by PLLEN bit)
100 = HS oscillator (PLL always disabled)
011 = INTOSCPLLO, internal oscillator with PLL (S/W controlled by PLLEN bit), CLKO
on RA6, port function on RA7
010 = INTOSCPLL, internal oscillator with PLL (S/W controlled by PLLEN bit), port
function on RA6 and RA7
001 = INTOSCO, internal oscillator, INTOSC or INTRC (PLL always disabled), CLKO on
RA6, port function on RA7
000 = INTOSC, internal oscillator INTOSC or INTRC (PLL always disabled), port function
on RA6 and RA7
WDTPS<3:0>
CONFIG2H(1,2) Watchdog Timer Postscale Select bits 1111 = 1:32,768
1110 = 1:16,384
1101 = 1:8,192
1100 = 1:4,096
1011 = 1:2,048
1010 = 1:1,024
1001 = 1:512
1000 = 1:256
0111 = 1:128
0110 = 1:64
0101 = 1:32
0100 = 1:16
0011 = 1:8
0010 = 1:4
0001 = 1:2
0000 = 1:1
TABLE 5-5:
PIC18F46J11 AND PIC18F46J50 FAMILY DEVICES: BIT DESCRIPTIONS (CONTINUED)
Bit Name
Configuration
Words
Description
Note 1: The Configuration bits can only be programmed indirectly by programming the Flash Configuration Word.
2: The Configuration bits are reset to ‘1’ only on VDD Reset; it is reloaded with the programmed value at any device Reset.
3: These bits are not implemented in PIC18F46J11 family devices.
4: Once this bit is cleared, all the Configuration registers which reside in the last page are also protected. To disable code
protection, perform an ICSP Bulk Erase operation.