UPD784938 Datasheet, PDF (547/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 23 INTERRUPT FUNCTIONS
Figure 23-9. Non-Maskable Interrupt Request Acknowledgment Operations (1/2)
(a) When a new NMI request is generated during NMI service program execution
Main routine
(NMIS = 1)
NMI request
NMI request NMI request held pending since NMIS = 1
Pending NMI request is processed
(b) When a watchdog timer interrupt request is generated during NMI service program execution (when the
watchdog timer interrupt priority is higher (when PRC in the WDM = 1))
Main routine
NMI request
Watchdog
timer interrupt
request
Preliminary User’s Manual U13987EJ1V0UM00
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