Datasheet

V850ES/JG3 CHAPTER 19 INTERRUPT/EXCEPTION PROCESSING FUNCTION
R01UH0015EJ0300 Rev.3.00 Page 640 of 870
Sep 30, 2010
Figure 19-1. Non-Maskable Interrupt Request Signal Acknowledgment Operation (2/2)
(b) Non-maskable interrupt request signal generated during non-maskable interrupt servicing
Non-maskable
interrupt being
serviced
Non-maskable interrupt request signal generated during non-maskable interrupt servicing
NMI INTWDT2
NMI • NMI request generated during NMI servicing • INTWDT2 request generated during NMI servicing
(NP bit = 1 retained before INTWDT2 request)
Main routine
NMI
request
NMI servicing
(Held pending)
Servicing of
pending NMI
NMI
request
Main routine
System reset
NMI
request
NMI servicing
(Held pending)
INTWDT2
servicing
INTWDT2
request
• INTWDT2 request generated during NMI servicing
(NP bit = 0 set before INTWDT2 request)
Main routine
System reset
NMI
request
NMI
servicing
INTWDT2
servicing
INTWDT2
request
NP = 0
• INTWDT2 request generated during NMI servicing
(NP = 0 set after INTWDT2 request)
Main routine
System reset
NMI
request
NMI
servicing
INTWDT2
servicing
NP = 0
• INTWDT2 request generated during INTWDT2 servicing
Main routine
System reset
INTWDT2 request
INTWDT2 servicing
(Invalid)
• NMI request generated during INTWDT2 servicing
INTWDT2
Main routine
System reset
INTWDT2 request
INTWDT2 servicing
(Invalid)
NMI
request
(Held pending)
INTWDT2
request
INTWDT2
request