PIC18F258-I/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F258-I/SP

28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

Microchip Technology 

PIC18FXX8

FIGURE 24-2:

WAKE-UP FROM SLEEP THROUGH INTERRUPT(1,2)

OSC1

CLKO(4)

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1

INT pin

INTF Flag

(INTCON<1>)

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

TOST(2)

Interrupt Latency(3)

GIEH bit

(INTCON<7>)

INSTRUCTION FLOW

PC

PC

Instruction

Fetched

Inst(PC) = Sleep

Instruction

Executed

Inst(PC – 1)

Processor in

Sleep

PC + 2

Inst(PC + 2)

Sleep

PC + 4

PC + 4

Inst(PC + 4)

Inst(PC + 2)

PC + 4

Dummy Cycle

0008h

Inst(0008h)

Dummy Cycle

000Ah

Inst(000Ah)

Inst(0008h)

Note

1: XT, HS or LP Oscillator mode assumed.

2: GIE = 1 assumed. In this case, after wake-up, the processor jumps to the interrupt routine. If GIE = 0, execution will continue in-line.

3: TOST = 1024 TOSC (drawing not to scale). This delay will not occur for RC and EC Oscillator modes.

4: CLKO is not available in these oscillator modes but shown here for timing reference.

© 2006 Microchip Technology Inc.

DS41159E-page 275

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