Datasheet

PIC18(L)F2X/45K50
DS30684A-page 32  2012 Microchip Technology Inc.
FIGURE 3-1: SIMPLIFIED OSCILLATOR SYSTEM BLOCK DIAGRAM
Note 1: Details in Figure 3-3.
2: Details in Figure 3-2.
3: Details in Tab le 3 -1 .
4: The Primary Oscillator MUX uses the INTOSC branch when FOSC<3:0> = 100x.
SOSCO
SOSCI
Secondary
Oscillator
(SOSC)
Secondary Oscillator
(1)
OSC2
OSC1
Primary
Oscillator
(2)
(OSC)
Primary Oscillator
0
1
FOSC<3:0>
(4)
PLL_Select
(3)
0
1
4xPLL
INTOSC
Primary Clock Module
Low-Power Mode
Event Switch
(SCS<1:0>)
01
00
1x
Secondary
Oscillator
2
Primary
Clock
INTOSC
Clock Switch MUX
INTOSC
IRCF<2:0>
INTSRC
HF-16 MH
Z
HF-8 MH Z
HF-4 MH Z
HF-2 MH Z
HF-1 MH Z
HF-31.25 kH Z
HF-250 kH Z
HF-500 kH Z
HFINTOSC
INTRC
(16 MHz)
(31.25 kHz)
INTOSC
Divide
Circuit
Internal Oscillator MUX
(3)
LF-31.25 kHz
3
3
Internal Oscillator
SOSCOUT
PCLKEN
PRISD
EN
3x or
CPU
Peripherals
IDLE
 4
RA6
CLKO
Enabled Modes
USB Module
1
0
FSEN
 8
1
0
 4
LS48MHZ
Clock
Needs 48 MHz for FS
Needs 6 MHz for LS
PLL Postscaler
 2
 3
 4
 6
11
10
01
00
CPUDIV