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Figure 19-7. Flowchart of Non-Maskable Interrupt Request Generation to Acknowledgment
WDTM: Watchdog timer mode register
WDT:
Figure 19-8. Non-Maskable Interrupt Request Acknowledgment Timing
CPU processing
Instruction
WDTIF
WDTIF: Watchdog timer interrupt request flag
CHAPTER 19 INTERRUPT FUNCTIONS
Start
WDTM4 = 1
(with watchdog timer
mode selected)?
Yes
Overflow in WDT?
Yes
WDTM3 = 0
(with non-maskable
interrupt selected)?
Yes
Interrupt request generation
WDT interrupt
servicing?
Yes
Interrupt
control register not
accessed?
Yes
Start of interrupt servicing
Watchdog timer
Instruction
Interrupt request generated during this interval is acknowledged at
User's Manual U15798EJ2V0UD
No
Interval timer
No
No
Reset processing
No
Interrupt request held pending
No
PSW and PC save, jump
to interrupt servicing
Interrupt service
program
.
397
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