
PIC18(L)F2X/4XK22
DS41412E-page 30
2010-2012 Microchip Technology Inc.
FIGURE 2-2:
INTERNAL OSCILLATOR
MUX BLOCK DIAGRAM
FIGURE 2-3:
PLL_SELECT BLOCK
DIAGRAM
111
110
101
100
001
000
INTOSC
250 kHZ
500 kHZ
31.25 kHZ
1
0
1
0
11
10
0X
IRCF<2:0>
MFIOSEL
INTSRC
HF-16 MHZ
HF-8 MHZ
HF-4 MHZ
HF-2 MHZ
HF-1 MHZ
LF-31.25 KHZ
MF-31.25 KHZ
HF-31.25 KHZ
HF-250 KHZ
MF-250 KHZ
HF-500 KHZ
MF-500 KHZ
3
011
010
PLL_Select
PLLCFG
FOSC<3:0> = 100x
PLLEN
TABLE 2-1:
PLL_SELECT TRUTH TABLE
Primary Clock MUX Source
FOSC<3:0>
PLLCFG
PLLEN
PLL_Select
FOSC (any source)
0000-1111
0
OSC1/OSC2 (external source)
0000-0111
1010-1111
1x
1
01
1
INTOSC (internal source)
1000-1001
x
0
x1
1