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Figure 18-9. Flowchart from Non-Maskable Interrupt Request Generation to Acknowledge
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WDTM
: Watchdog timer mode register
WDT
: Watchdog timer
CPU Processing
TMIF4
TMIF4
: Watchdog timer interrupt request flag
460
CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION
(with watchdog timer
(with non-maskable
interrupt request
Interrupt request generation
Figure 18-10. Non-Maskable Interrupt Request Acknowledge Timing
Instruction
The interrupt request generated in this period is acknowledged at timing.
Start
WDTM4 = 1
No
mode selected)?
Yes
Overflow in
No
WDT?
Yes
WDTM3 = 0
No
selected)?
Yes
No
WDT interrupt
servicing?
Yes
Interrupt
No
control register
unaccessed?
Yes
Interrupt service
start
Instruction
Interval timer
Reset processing
Interrupt request
reserve
PSW, PC save, jump
Interrupt servicing
to interrupt servicing
program
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