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CHAPTER 12 INTERRUPT FUNCTIONS
User’s Manual U15104EJ2V0UD
Figure 12-9. Non-Maskable Interrupt Request Acknowledgement Operation
(a)
If a new non-maskable interrupt request is generated during
non-maskable interrupt servicing program execution
(b)
If two non-maskable interrupt requests are generated during
non-maskable interrupt servicing program execution
Main routine
NMI request
Execution of one instruction
NMI request
NMI request is held pending.
Pending NMI request is serviced.
NMI request
NMI
request
Held pending.
Only one NMI request is acknowledged
even if two or more NMI requests are
generated in duplicate.
NMI
request
Held pending.
Main routine
Execution of one instruction