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CHAPTER 5 INTERRUPT/EXCEPTION PROCESSING FUNCTION
106
Figure 5-2. Accepting Non-Maskable Interrupt Request
(a) If a new NMI request is generated while an NMI service routine is executing:
Main routine
NMI request
NMI request
(PSW. NP = 1)
NMI request pending because PSW. NP = 1
Pending NMI request processed
(b) If a new NMI request is generated twice while an NMI service routine is executing:
Main routine
NMI request
NMI request
Kept pending because NMI service program is being processed
Kept pending because NMI service program is being processed
NMI request
Only one NMI request is accepted even though
two or more NMI requests are generated
Содержание V850/SA1 mPD703015
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