PIC18F258 Datasheet, PDF (273/384 Pages) Microchip Technology – High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN

PIC18FXX8
FIGURE 24-2:
WAKE-UP FROM SLEEP THROUGH INTERRUPT^(1,2)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
OSC1
CLKO⁽⁴⁾
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
TOST⁽²⁾
INT pin
INTF flag
(INTCON<1>)
Interrupt Latency⁽³⁾
GIEH bit
(INTCON<7>)
INSTRUCTION FLOW
PC
PC
Instruction
Fetched
Instruction
Executed
Inst(PC) = SLEEP
Inst(PC - 1)
PC+2
Inst(PC + 2)
SLEEP
Processor in
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 Osc modes.
4: CLKO is not available in these Osc modes, but shown here for timing reference.
 2002 Microchip Technology Inc.
Preliminary
DS41159B-page 271