Flowchart From The Time A Non-Maskable Interrupt Request Is Generated Until It Is Received; Non-Maskable Interrupt Request Acknowledge Timing - NEC PD78056F User Manual

Figure 21-10. Flowchart from the Time a Non-maskable Interrupt Request Is Generated Until
It Is Received
Figure 21-11. Non-Maskable Interrupt Request Acknowledge Timing
CPU Processing Instruction
TMIF4
TMIF4: Watchdog Timer Interrupt Request Flag
492
CHAPTER 21 INTERRUPT AND TEST FUNCTIONS
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 generated during this time are received
at the timing indicated by .
No
Interval timer
No
No
Reset processing
No
Interrupt request
held pending
No
PSW and PC Save, Jump
to Interrupt Servicing
Interrupt Servicing
Program