NEC 78014Y Series User Manual page 461

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CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION
Figure 18-11. Non-Maskable Interrupt Request Acknowledge Operation
(a) If a new non-maskable interrupt request is generated during
non-maskable interrupt servicing program execution
Main Routine
NMI request <1>
Execution of one instruction
(b) If two non-maskable interrupt requests are newly generated during
non-maskable interrupt servicing program execution
Main Routine
NMI request <1>
Execution of one instruction
NMI request <1> executed.
NMI request <2> kept pending.
NMI request <2>
Pending NMI request <2> is serviced.
NMI request <1> executed.
NMI request <2> kept pending.
NMI request <2>
NMI request <3> kept pending.
NMI request <3>
Pending NMI request <2> is serviced.
NMI request <3> is not accepted
(only one NMI request is accepted even if
two or more NMI requests are generated
in duplicate).
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