NEC mPD780065 Series Preliminary User's Manual page 275

Figure 17-9. Non-Maskable Interrupt Request Acknowledge Operation
(a) If a non-maskable interrupt request is generated during non-maskable interrupt servicing program
execution
NMI request <1>
Execution of 1 instruction
(b) If two non-maskable interrupt requests are generated during non-maskable interrupt servicing program
execution
NMI request <1>
Execution of 1 instruction
CHAPTER 17 INTERRUPT FUNCTIONS
Main routine
NMI request <2>
Main routine
NMI request <2>
NMI request <3>
Preliminary User's Manual U13420EJ2V0UM00
Execution of NMI request <1>
NMI request <2> held pending
Servicing of NMI request <2> that was pended
Execution of NMI request <1>
NMI request <2> held pending
NMI request <3> held pending
Servicing of NMI request <2> that was pended
NMI request <3> not acknowledged
(Although two or more NMI requests have been generated,
only one request is acknowledged.
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