CHAPTER 5 INTERRUPT/EXCEPTION PROCESSING FUNCTION
User’s Manual U13850EJ6V0UD
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Figure 5-2. Acknowledging Non-Maskable Interrupt Request
(a) If a new NMI request is generated while an NMI service routine is being executed:
Main routine
NMI request
NMI request
(PSW. NP = 1)
NMI request held pending because PSW. NP = 1
Pending NMI request processed
(b) If a new NMI request is generated twice while an NMI service routine is being executed:
Main routine
NMI request
NMI request
Held pending because NMI service program is being processed
Held pending because NMI service program is being processed
NMI request
Only one NMI request is acknowledged even though
two or more NMI requests are generated
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