Datasheet

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
00
1
000
INTOSC
250 kHZ
500 kHZ
31.25 kHZ
1
0
1
0
11
10
0
X
IRCF<2:0>
MFIOSEL
INTSRC
HF-16 MH
Z
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 0 0
OSC1/OSC2 (external source) 0000-0111
1010-1111
1x1
011
INTOSC (internal source) 1000-1001 x 0 0
x11