Renesas NU85E Preliminary User's Manual page 213

Figure 8-1. Example of Non-Maskable Interrupt Request Acknowledgement Operation (2/2)
NMI being
serviced
• NMI0 request generated
NMI0
during NMI0 servicing
Main routine
NMI0 request
• NMI0 request generated
NMI1
during NMI1 servicing
Main routine
NMI1 request
• NMI0 request generated
NMI2
during NMI2 servicing
Main routine
NMI2 request
CHAPTER 8 INTC
(b) NMI request generated during NMI servicing
NMI request generated during NMI servicing
NMI0
• NMI1 request generated
during NMI0 servicing
(NP = 1 retained before
NMI1 request)
NMI0 servicing
Main routine
NMI0 request
(Held pending)
NMI0 request
Servicing of
pending NMI0
• NMI1 request generated
during NMI0 servicing (NP =
0 set after NMI1 request)
Main routine
NMI0
request
• NMI1 request generated
during NMI0 servicing (NP =
0 set before NMI1 request)
Main routine
NMI0
request
• NMI1 request generated
during NMI1 servicing
Main routine
NMI1 servicing
NMI0 request
(Invalid)
NMI1 request
System reset
• NMI1 request generated
during NMI2 servicing
Main routine
NMI2 servicing
NMI0 request
(Invalid)
NMI2 request
System reset
Preliminary User's Manual A14874EJ3V0UM
NMI1
• NMI2 request generated
during NMI0 servicing
Main routine
NMI0 request
NMI0 servicing
NMI1 request (Held pending)
NMI1 servicing
System reset
NMI0 servicing NMI1
servicing
NP = 0
NMI1 request
System reset
NMI0 servicing NMI1
servicing
(Held
NMI1
pending)
request
NP = 0
System reset
• NMI2 request generated
during NMI1 servicing
Main routine
NMI1 servicing
NMI1
request
NMI1 request
(Invalid)
System reset
• NMI2 request generated
during NMI2 servicing
NMI2 servicing
NMI1 request (Invalid)
NMI2 request
System reset
NMI2
NMI0 servicing
NMI2 servicing
NMI2 request
System reset
NMI2
NMI1 servicing
servicing
NMI2 request
System reset
Main routine
NMI2 servicing
NMI2 request
(Invalid)
System reset
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