Datasheet

PIC18F87K22 FAMILY
DS39960D-page 44  2009-2011 Microchip Technology Inc.
FIGURE 3-1: PIC18F87K22 FAMILY CLOCK DIAGRAM
TABLE 3-1: HS, EC, XT, LP AND RC MODES: RANGES AND SETTINGS
Mode Frequency Range FOSC<3:0> Setting
EC1 (low power)
DC-160 kHz
1101
(EC1 & EC1IO) 1100
EC2 (medium power)
160kHz-16MHz
1011
(EC2 & EC2IO) 1010
EC3 (high power)
16 MHz-64 MHz
0101
(EC3 & EC3IO) 0100
HS1 (medium power) 4 MHz-16 MHz 0011
HS2 (high power) 16 MHz-25 MHz 0010
XT 100 kHz-4 MHz 0001
LP 31.25 kHz 0000
RC (External) 0-4 MHz 001x
INTIO 32 KHz-16 MHz
100x
(and OSCCON, OSCCON2)
OSC2
OSC1
SOSCO
SOSCI
HF INTOSC
16 MHz to
31 kHz
MF INTOSC
500 kHz to
31 kHz
LF INTOSC
31 kHz
Postscaler
Postscaler
16 MHz
8 MHz
4 MHz
2 MHz
1 MHz
500 kHz
250 kHz
31 kHz
500 kHz
250 kHz
31 kHz
31 kHz
16 MHz
8 MHz
4 MHz
2 MHz
1 MHz
500 kHz
250 kHz
31 kHz
4x PLL
FOSC<3:0>
INTSRC
MUX
MUX
MUX
MUX
MFIOSEL
Mux
Peripherals
CPU
IDLEN
Clock Control
FOSC<3:0>
SCS<1:0>
111
110
101
100
011
010
001
000
IRCF<2:0>
MUX
PLLEN
and PLLCFG