183
CHAPTER 12 INTERRUPT FUNCTION
Figure 12-10. Non-Maskable Interrupt Request Acknowledge 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
➀
1 Instruction
Execution
NMI Request
➁
NMI Request
➀
Execute
NMI Request
➁
Reserve
Reserved NMI Request Processing
Main Routine
NMI Request
➀
1 Instruction
Execution
NMI
Request
➁
NMI Request
➀
Execute
NMI Request
➁
Reserve
NMI Request
➂
Reserve
Reserved NMI Request
➁
Processing
Cannot acknowledge NMI Request
➂
(Although multiple NMI requests may
be generated twice or more, they
can only be acknowledged once.)
NMI
Request
➂
Содержание NEC PD78081(A)
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