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CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION
460
Figure 18-9. Flowchart from Non-Maskable Interrupt Request Generation to Acknowledge
WDTM
: Watchdog timer mode register
WDT
: Watchdog timer
Figure 18-10. Non-Maskable Interrupt Request Acknowledge Timing
TMIF4
: Watchdog timer interrupt request flag
Start
WDTM4 = 1
(with watchdog timer
mode selected)?
Overflow in
WDT?
WDTM3 = 0
(with non-maskable
interrupt request
selected)?
Interrupt request generation
WDT interrupt
servicing?
Interrupt
control register
unaccessed?
Interrupt service
start
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Interval timer
Reset processing
Interrupt request
reserve
CPU Processing
Instruction
Instruction
PSW, PC save, jump
to interrupt servicing
The interrupt request generated in this period is acknowledged at timing.
Interrupt servicing
program
TMIF4
Содержание 78014Y Series
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