NEC UPD789026 Series User Manual page 159

Figure 10-8. Flowchart from Non-Maskable Interrupt Request Generation to Acceptance
CPU Processing
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TMIF4
CHAPTER 10 INTERRUPT FUNCTIONS
Start
WDTM4 = 1
(watchdog timer mode
is selected)
Yes
WDT
overflows
Yes
WDTM3 = 0
(non-maskable interrupt
is selected)
Yes
Interrupt request is generated
Interrupt processing is started
WDTM : Watchdog timer mode register
WDT : Watchdog timer
Figure 10-9. Non-Maskable Interrupt Request Acceptance Timing
Instruction
User's Manual U11919EJ3V0UM00
No
Interval Timer
No
No
Reset Processing
Saving PSW and PC, and
Instruction
jump to interrupt processing Interrupt Processing Program
159