Flowchart Of Generation From Non-Maskable Interrupt Request To Acknowledgment; Non-Maskable Interrupt Request Acknowledge Timing - NEC PD78052 User Manual

Figure 21-10. Flowchart of Generation from Non-Maskable Interrupt Request to Acknowledgment
Figure 21-11. Non-Maskable Interrupt Request Acknowledge Timing
CPU Instruction Instruction
TMIF4
498
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 request
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
The interrupt request generated during this period is acknowledged at the timing of .
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