PIC18LF2X Datasheet, PDF (30/44 Pages) Microchip Technology – 28/40/44-Pin, Low-Power, High-Performance Microcontrollers with XLP Technology

PIC18(L)F2X/4XK50
TABLE 5-3: PIC18(L)F2X/4XK50 BIT DESCRIPTIONS
Bit Name
Configuration
Words
Description
USBLSDIV
CONFIG1L
USB Low-Speed Clock Selection bit
Selects the clock source for Low-speed USB operation
1 = USB clock source comes from the 48 MHz system clock divided by 8
0 = USB clock source comes from the 24 MHz system clock divided by 4
CPUDIV<1:0> CONFIG1L CPU System Clock Selection bits
PLLEN
PLLMULT
CONFIG1L
CONFIG1L
11 = CPU system clock divided by 6
10 = CPU system clock divided by 3
01 = CPU system clock divided by 2
00 = No CPU system clock divide
PLL Enable bit⁽²⁾
1 = Oscillator multiplied by 3 or 4, depending on the PLLMULT bit
0 = Oscillator used directly
PLL Multiplier Selection bit⁽²⁾
1 = Output frequency is 3x the input frequency
0 = Output frequency is 4x the input frequency
IESO
CONFIG1H
Internal External Switchover bit
1 = Internal External Switchover mode enabled
0 = Internal External Switchover mode disabled
FCMEN
CONFIG1H Fail-Safe Clock Monitor Enable bit
1 = Fail-Safe Clock Monitor enabled
0 = Fail-Safe Clock Monitor disabled
PCLKEN
CONFIG1H
Primary Clock Enable bit
1 = Primary clock enabled
0 = Primary clock disabled
FOSC<3:0>
CONFIG1H Oscillator Selection bits
1111 = External RC oscillator, CLKOUT function on OSC2
1110 = External RC oscillator, CLKOUT function on OSC2
1101 = EC oscillator (low power)
1100 = EC oscillator, CLKOUT function on OSC2 (low power)
1011 = EC oscillator (medium power, 4 MHz-16 MHz)
1010 = EC oscillator, CLKOUT function on OSC2 (medium power, 4 MHz-16 MHz)
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 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
LPBOR
CONFIG2L Low-Power Brown-out Reset Enable bits
1 = Low-Power Brown-out Reset disabled
0 = Low-Power Brown-out Reset enabled
Note 1: Minimum VDD for F devices is 2.3V.
2: When the 3x Multiplier mode is selected, the input frequency has to be 16 MHz. When the 4x Multiplier
mode is selected, the input frequency has to be between 8 MHz and 16 MHz.
3: The dedicated In-Circuit Port is available only on the 44-pin TQFP packaged devices. This bit should be
programmed to a ‘0’ in all other devices. See Section 2.2 “Dedicated ICSP/ICD Port (44-Pin TQFP
Only)” for more information.
DS41630B-page 30
 2012 Microchip Technology Inc.