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How does the CPU operate after the watchdog timer has timed out?

Latest Updated:04/01/2006

Question:

How does the CPU operate after the watchdog timer has timed out?

Answer:

When a watchdog timer timeout occurs, a non-maskable interrupt (INTWTD) is generated.
If NMI processing is not in progress then, the interrupt is acknowledged, the interrupt with the exception code 0020H is generated, and the program branches to the handler address (00000020H).

For details of the processing that occurs at this time, refer to "5.2 Non-Maskable Interrupt" in Chapter 5 of the User's Manual (for V853, V850/SA1, V850/SB, etc.).
[Remark]
When a watchdog timer in a V850ES/Kx1, V850ES/SG2, V850ES/SJ2, V850ES/SA2, or V850ES/SA3 device experiences a timeout, you can specify either a reset or a non-maskable interrupt to occur.
Suitable Products
V850 Family