PIC18F4550-IP Datasheet, PDF(26/438 Page) Microchip Technology – 28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

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PIC18F4550-IP Datasheet, PDF (26/438 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

Internal

Oscillator

Block

8 MHz

Source

INTRC

Source

8 MHz

(INTOSC)

31 kHz (INTRC)

PLLDIV

USB Clock Source

Ã· 12 111

Ã· 10 110

Ã· 6 101

Ã· 5 100

Ã· 4 011

(4 MHz Input Only)

96 MHz

PLL

Ã·2

USBDIV

0

1

Ã·3

010

Ã· 2 001

Ã· 1 000

HSPLL, ECPLL,

XTPLL, ECPIO

FSEN

1

USB

Peripheral

CPUDIV

CPUDIV

Ã·4

11

Ã· 3 10

Ã· 2 01

Ã· 1 00

Ã· 6 11

Ã·4

Ã· 4 10

Ã· 3 01

Ã· 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

DS39632E-page 24

Â© 2009 Microchip Technology Inc.

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