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Renesas Electronics Europe - Knowledgebase

Is it OK if watchdog timer is cleared amid timer interrupt processing?

Latest Updated: 03/20/2017


The watchdog timer is used to prevent CPU lockup. To simplify the program, the watchdog timer is cleared during the periodical timer interrupt processing.
Is this OK?


We do not recommend that the watchdog timer be cleared during timer interrupt processing, because even if the main routine is locked up in this system, if a timer interrupt is acknowledged, the watchdog timer will be cleared and the system cannot detect a CPU lockup.
Suitable Products
V850 Family