Flowchart From Non-Maskable Interrupt Request Generation To Acknowledgment; Non-Maskable Interrupt Request Acknowledge Timing - NEC PD78081(A) User Manual

Figure 12-8. Flowchart from Non-Maskable Interrupt Request Generation to Acknowledgment
Figure 12-9. Non-Maskable Interrupt Request Acknowledge Timing
CPU Instruction Instruction
TMIF4
182
CHAPTER 12 INTERRUPT FUNCTION
Start
WDTM4=1
(with watchdog timer
mode selected)?
Yes
Overflow in WDT?
Yes
WDTM3=0
(with non-maskable
interrupt selected)?
Yes
Interrupt request generation
WDT interrupt servicing?
Yes
Interrupt control
register unaccessed?
Yes
Interrupt
service start
WDTM : Watchdog timer mode register
WDT : Watchdog timer
Instruction
Interrupt requests which generate within this space are acknowledged with
TMIF4 : Watchdog timer interrupt request flag
No
Interval timer
No
No
Reset processing
No
Interrupt request
held pending
No
PSW and PC Save, Jump
to Interrupt Servicing
Interrupt Sevicing
Program
timing.