Interrupt Request Hold - NEC PD78081(A) User Manual

The interrupt request reserve timing is shown in Figure 12-15.
CPU processing
IF
Remarks 1. Instruction N: Instruction that holds interrupts requests
2. Instruction M: Instructions other than instruction N
3. The operation of
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CHAPTER 12 INTERRUPT FUNCTION
Figure 12-15. Interrupt Request Hold
Instruction N
IF (interrupt request) is not affected by
Save PSW and PC,
Instruction M
Jump to interrupt service
Interrupt service
program
PR (priority level) values.