NEC V850ES/SA2 UPD703201 Manual page 422

Figure 14-1. Non-Maskable Interrupt Request Acknowledgement Operation (2/2)
(b) Non-maskable interrupt request generated during non-maskable interrupt servicing
Non-maskable
interrupt being
serviced
• NMI request generated during NMI servicing
NMI
Main routine
NMI
request
• NMI request generated during INTWDT servicing
INTWDT
INTWDT request
422
CHAPTER 14 INTERRUPT/EXCEPTION PROCESSING FUNCTION
Non-maskable interrupt request generated during non-maskable interrupt servicing
NMI
NMI servicing
NMI
(Held pending)
request
Servicing of
pending NMI
Main routine
INTWDT
NMI
(Invalid)
request
System reset
Preliminary User's Manual U15905EJ1V0UD
• INTWDT request generated during NMI servicing
(NP = 1 retained before INTWDT request)
Main routine
NMI
request
• INTWDT request generated during NMI servicing
(NP = 0 set before INTWDT request)
Main routine
NP = 0
NMI
INTWDT
request
request
• INTWDT request generated during NMI servicing
(NP = 0 set after INTWDT request)
Main routine
INTWDT
request
NMI
NP = 0
request
• INTWDT request generated during INTWDT servicing
Main routine
servicing
INTWDT request
INTWDT
NMI servicing
INTWDT
(Held pending)
request
INTWDT servicing
System reset
NMI
INTWDT
servicing
servicing
System reset
NMI
INTWDT
servicing
servicing
(Held pending)
System reset
INTWDT servicing
(Invalid)
INTWDT
request
System reset