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The watchdog timer is a timer that detects inadvertent program loops.
Watchdog timer interrupts are used to detect system or program errors. For this purpose, instructions that clear the
watchdog timer (start the count) within a given period are inserted at various places in a program.
If an instruction that clears the watchdog timer is not executed within the set time and the watchdog timer overflows,
a watchdog timer interrupt (INTWDT) is generated and a program error is reported.
12.1 CONFIGURATION
The watchdog timer block diagram is shown in Figure 12-1.
f
CLK
CHAPTER 12 WATCHDOG TIMER FUNCTION
Figure 12-1 Watchdog Timer Block Diagram
Watchdog Timer
Clear Signal
User's Manual U11316EJ4V1UD
21
f
/2
CLK
20
f
/2
CLK
Selector
19
f
/2
CLK
17
f
/2
CLK
INTWDT
373
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