PIC18F1XK22 Datasheet, PDF (263/388 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC18F1XK22/LF1XK22
REGISTER 22-1: CONFIG1H: CONFIGURATION REGISTER 1 HIGH
R/P-0
IESO
bit 7
R/P-0
FCMEN
R/P-1
PCLKEN
R/P-0
PLL_EN
R/P-0
FOSC3
R/P-1
FOSC2
R/P-1
FOSC1
Legend:
R = Readable bit
P = Programmable bit
-n = Value when device is unprogrammed
U = Unimplemented bit, read as ‘0’
x = Bit is unknown
bit 7
bit 6
bit 5
bit 4
bit 3-0
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
PCLKEN: Primary Clock Enable bit
1 = Primary Clock enabled
0 = Primary Clock is under software control
PLL_EN: 4 X PLL Enable bit
1 = Oscillator multiplied by 4
0 = PLL is under software control
FOSC<3:0>: Oscillator Selection bits
1111 = External RC oscillator, CLKOUT function on OSC2
1110 = External RC oscillator, CLKOUT function on OSC2
1101 = EC (low)
1100 = EC, CLKOUT function on OSC2 (low)
1011 = EC (medium)
1010 = EC, CLKOUT function on OSC2 (medium)
1001 = Internal RC oscillator, CLKOUT function on OSC2
1000 = Internal RC oscillator
0111 = External RC oscillator
0110 = External RC oscillator, CLKOUT function on OSC2
0101 = EC (high)
0100 = EC, CLKOUT function on OSC2 (high)
0011 = External RC oscillator, CLKOUT function on OSC2
0010 = HS oscillator
0001 = XT oscillator
0000 = LP oscillator
R/P-1
FOSC0
bit 0
 2010 Microchip Technology Inc.
Preliminary
DS41365D-page 263