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problem on watchdog

Question asked by Peden.Fabrice on Aug 5, 2013
Latest reply on Aug 5, 2013 by Jack Peacock
Hi everbody,

I'm using a ST32F205VE. On my board, I'm using the internal watchdog of the microcontroller and an external watchdog (MCP1318T).

During normal operation, the µc sends square pulses every 0.5s to the external watchdog. When the µc stops sending pulses, the external watchdog sends me a rising edge.
Then, the µc is restarting because So it works well.

My issue is when the µc is restarting (with his internal watchdog), I got something strange, because the pulses that the µc is sending to the external watchdog are 3 times longer (0.5s to 1.5s) and I've changed nothing in my configuration.

I'm looking for explanations in the datasheet, but I've found nothing...

If you've some ideas...thank you in advance.