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| PIC18F2455_07 Datasheet, PDF (26/430 Pages) Microchip Technology – 28/40/44-Pin, High Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology | |||
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PIC18F2455/2550/4455/4550
FIGURE 2-1:
PIC18F2455/2550/4455/4550 CLOCK DIAGRAM
OSC2
OSC1
T1OSO
T1OSI
PIC18F2455/2550/4455/4550
Primary Oscillator
Sleep
XT, HS, EC, ECIO
Secondary Oscillator
T1OSCEN
Enable
Oscillator
OSCCON<6:4>
Internal
Oscillator
Block
8 MHz
Source
INTRC
Source
8 MHz
(INTOSC)
31 kHz (INTRC)
PLLDIV
USB Clock Source
÷ 12 111
÷ 10 110
÷ 6 101
÷ 5 100
÷ 4 011
(4 MHz Input Only)
96 MHz
PLL
÷2
USBDIV
0
1
÷ 3 010
÷ 2 001
÷ 1 000
HSPLL, ECPLL,
XTPLL, ECPIO
FSEN
1
USB
Peripheral
CPUDIV
CPUDIV
÷ 4 11
÷3
10
÷ 2 01
÷ 1 00
÷6
÷4
11
÷ 4 10
÷ 3 01
÷ 2 00
1
0 Primary
Clock
FOSC3:FOSC0
0
CPU
IDLEN
Peripherals
T1OSC
OSCCON<6:4>
8 MHz
111
4 MHz
110
2 MHz
101
1 MHz
100
500 kHz
011
250 kHz
010
125 kHz
001
1 31 kHz 000
0
OSCTUNE<7>
Internal Oscillator
Clock
Control
FOSC3:FOSC0 OSCCON<1:0>
Clock Source Option
for other Modules
WDT, PWRT, FSCM
and Two-Speed Start-up
DS39632D-page 24
Preliminary
© 2007 Microchip Technology Inc.
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