PIC18F23K22 Datasheet, PDF (351/492 Pages) Microchip Technology – 28/40/44-Pin, Low-Power, High-Performance Microcontrollers with nanoWatt XLP Technology

PIC18(L)F2X/4XK22
REGISTER 24-1: CONFIG1H: CONFIGURATION REGISTER 1 HIGH
R/P-0
IESO
bit 7
R/P-0
FCMEN
R/P-1
PRICLKEN
R/P-0
PLLCFG
R/P-0
R/P-1
R/P-0
FOSC<3:0>
R/P-1
bit 0
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
Note 1:
IESO⁽¹⁾: Internal/External Oscillator Switchover bit
1 = Oscillator Switchover mode enabled
0 = Oscillator Switchover mode disabled
FCMEN⁽¹⁾: Fail-Safe Clock Monitor Enable bit
1 = Fail-Safe Clock Monitor enabled
0 = Fail-Safe Clock Monitor disabled
PRICLKEN: Primary Clock Enable bit
1 = Primary Clock is always enabled
0 = Primary Clock can be disabled by software
PLLCFG: 4 x PLL Enable bit
1 = 4 x PLL always enabled, Oscillator multiplied by 4
0 = 4 x PLL is under software control, PLLEN (OSCTUNE<6>)
FOSC<3:0>: Oscillator Selection bits
1111 = External RC oscillator, CLKOUT function on RA6
1110 = External RC oscillator, CLKOUT function on RA6
1101 = EC oscillator (low power, <500 kHz)
1100 = EC oscillator, CLKOUT function on OSC2 (low power, <500 kHz)
1011 = EC oscillator (medium power, 500 kHz-16 MHz)
1010 = EC oscillator, CLKOUT function on OSC2 (medium power, 500 kHz-16 MHz)
1001 = Internal oscillator block, CLKOUT function on OSC2
1000 = Internal oscillator block
0111 = External RC oscillator
0110 = External RC oscillator, CLKOUT function on OSC2
0101 = EC oscillator (high power, >16 MHz)
0100 = EC oscillator, CLKOUT function on OSC2 (high power, >16 MHz)
0011= HS oscillator (medium power, 4 MHz-16 MHz)
0010= HS oscillator (high power, >16 MHz)
0001= XT oscillator
0000= LP oscillator
When FOSC<3:0> is configured for HS, XT, or LP oscillator and FCMEN bit is set, then the IESO bit
should also be set to prevent a false failed clock indication and to enable automatic clock switch over from
the internal oscillator block to the external oscillator when the OST times out.
 2010 Microchip Technology Inc.
Preliminary
DS41412B-page 351