Flowchart Of Non-Maskable Interrupt Request Acknowledgment; Timing Of Non-Maskable Interrupt Request Acknowledgment; Acknowledging Non-Maskable Interrupt Request - NEC switch User Manual

Figure 11-8. Flowchart of Non-Maskable Interrupt Request Acknowledgment
Figure 11-9. Timing of Non-Maskable Interrupt Request Acknowledgment
CPU processing Instruction
TMIF4
Figure 11-10. Acknowledging Non-Maskable Interrupt Request
Main routine
NMI request
(first)
172
CHAPTER 11 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 is started
WDTM: Watchdog timer mode register
WDT: Watchdog timer
Instruction
NMI request
(second)
User's Manual U12978EJ3V0UD
No
Interval timer
No
No
Reset processing
Save PSW and PC, and
jump to interrupt servicing
First interrupt servicing
Second interrupt servicing
Interrupt servicing program