PIC18F23K20-E/MLQTP MICROCHIP [Microchip Technology], PIC18F23K20-E/MLQTP Datasheet - Page 293

• Manufacturer Part Number: PIC18F23K20-E/MLQTP
• Description: 28/40/44-Pin Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

REGISTER 23-1:
© 2007 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value when device is unprogrammed
bit 7
bit 6
bit 5-4
bit 3-0
R/P-0
IESO
IESO: Internal/External Oscillator Switchover 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
Unimplemented: Read as ‘0’
FOSC<3:0>: Oscillator Selection bits
11xx = External RC oscillator, CLKOUT function on RA6
101x = External RC oscillator, CLKOUT function on RA6
1001 = Internal oscillator block, CLKOUT function on RA6, port function on RA7
1000 = Internal oscillator block, port function on RA6 and RA7
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
0100 = EC oscillator, CLKOUT function on RA6
0011 = External RC oscillator, CLKOUT function on RA6
0010 = HS oscillator
0001 = XT oscillator
0000 = LP oscillator
FCMEN
R/P-0
CONFIG1H: CONFIGURATION REGISTER 1 HIGH
P = Programmable bit
U-0
—
Advance Information
U-0
—
U = Unimplemented bit, read as ‘0’
x = Bit is unknown
FOSC3
R/P-0
PIC18F2XK20/4XK20
FOSC2
R/P-1
FOSC1
R/P-1
DS41303B-page 291
FOSC0
R/P-1
bit 0