Flow From Generation Of Non-Maskable Interrupt Request To Acknowledgment; Timing Of Non-Maskable Interrupt Request Acknowledgment - NEC PD789488 User Manual

Figure 16-10. Flow from Generation of Non-Maskable Interrupt Request to Acknowledgment
Figure 16-11. Timing of Non-Maskable Interrupt Request Acknowledgment
CPU processing Instruction
WDTIF
Figure 16-12. Non-Maskable Interrupt Request Acknowledgment
Main routine
NMI request
(first)
302
CHAPTER 16 INTERRUPT FUNCTIONS
Start
WDTM4 = 1
(watchdog timer mode
is selected)
Yes
WDT
overflows
Yes
WDTM3 = 0
(non-maskable interrupt
is selected)
Yes
Interrupt request is generated
Interrupt servicing starts
WDTM: Watchdog timer mode register
WDT: Watchdog timer
Instruction
NMI request
(second)
User's Manual U15331EJ4V1UD
No
Interval timer
No
No
Reset processing
Saving PSW and PC, and
jump to interrupt servicing
First interrupt servicing
Second interrupt servicing
Interrupt servicing program