PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 258
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PIC18C658
Manufacturer Part Number
PIC18C658
Description
High-Performance Microcontrollers with CAN Module
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18C658.pdf
(366 pages)
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PIC18CXX8
22.3.2
When global interrupts are disabled (GIE cleared) and
any interrupt source has both its interrupt enable bit
and interrupt flag bit set, one of the following will occur:
• If an interrupt condition (interrupt flag bit and inter-
• If the interrupt condition occurs during or after
FIGURE 22-2: WAKE-UP FROM SLEEP THROUGH INTERRUPT
DS30475A-page 258
Note 1:
rupt enable bits are set) occurs before the execu-
tion of a SLEEP instruction, the SLEEP instruction
will complete as a NOP. Therefore, the WDT and
WDT postscaler will not be cleared, the TO bit will
not be set and PD bits will not be cleared.
the execution of a SLEEP instruction, the device
will immediately wake-up from sleep. The SLEEP
instruction will be completely executed before the
wake-up. Therefore, the WDT and WDT
postscaler will be cleared, the TO bit will be set
and the PD bit will be cleared.
INSTRUCTION FLOW
Instruction
fetched
CLKOUT
Instruction
executed
2:
3:
4:
INTIF bit
GIEH bit
INT pin
OSC1
WAKE-UP USING INTERRUPTS
PC
(4)
XT, HS or LP oscillator mode assumed.
GIE set is assumed. In this case, after wake- up, the processor jumps to the interrupt routine.
If GIE is cleared, execution will continue in-line.
T
CLKOUT is not available in these oscillator modes, but shown here for timing reference.
OST
Inst(PC) = SLEEP
Q1 Q2 Q3 Q4
= 1024T
Inst(PC - 1)
PC
OSC
(drawing not to scale). This delay will not occur for RC and EC osc modes.
Q1 Q2 Q3 Q4
Inst(PC + 2)
SLEEP
PC+2
Q1
Processor in
Advanced Information
SLEEP
PC+4
T
OST (2)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Inst(PC + 4)
Inst(PC + 2)
Even if the flag bits were checked before executing a
SLEEP instruction, it may be possible for flag bits to
become set before the SLEEP instruction completes. To
determine whether a SLEEP instruction executed, test
the PD bit. If the PD bit is set, the SLEEP instruction
was executed as a NOP.
To ensure that the WDT is cleared, a CLRWDT instruc-
tion should be executed before a SLEEP instruction.
PC+4
Interrupt Latency
Dummy cycle
(1,2)
PC + 4
(3)
Q1 Q2 Q3 Q4
2000 Microchip Technology Inc.
Inst(0008h)
Dummy cycle
0008h
Q1 Q2 Q3 Q4
Inst(000Ah)
Inst(0008h)
000Ah
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