PIC18F4550-IP Datasheet, PDF(41/438 Page) Microchip Technology – 28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

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PIC18F4550-IP Datasheet, PDF (41/438 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 3-3:

TRANSITION TIMING TO RC_RUN MODE

Q1 Q2 Q3 Q4 Q1

INTRC

OSC1

1

2

3

n-1 n

Clock Transition(1)

CPU

Clock

Peripheral

Clock

Program

Counter

PC

Note 1: Clock transition typically occurs within 2-4 TOSC.

PC + 2

Q2 Q3 Q4 Q1 Q2 Q3

PC + 4

FIGURE 3-4:

TRANSITION TIMING FROM RC_RUN MODE TO PRI_RUN MODE

INTOSC

Multiplexer

OSC1

PLL Clock

Output

Q1

Q2

Q3

Q4

TOST(1)

TPLL(1)

CPU Clock

Peripheral

Clock

Program

Counter

PC

SCS1:SCS0 bits Changed

OSTS bit Set

Q1

Q2 Q3 Q4 Q1 Q2 Q3

1 2 n-1 n

Clock(2)

Transition

PC + 2

PC + 4

Note 1: TOST = 1024 TOSC; TPLL = 2 ms (approx). These intervals are not shown to scale.

2: Clock transition typically occurs within 2-4 TOSC.

Â© 2009 Microchip Technology Inc.

DS39632E-page 39

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