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How to Expand Watchdog Timer ?

Stefan Fischer
Intellectual 680 points

Hi

i have the following constellation. I set my device to Standby Mode  and to save maximum Power i also power down the Flash. (FPWR = 0)

Now i want to wakeup from Standby with the Watchdog. This works fine so far but my problem is i want a longer time for the device to be in Standby Mode before it wakes up.

thus i need a longer Watchdog Time (and  i allready use max wdclk divider WDPS =7.)

 I have the problem that i can't  serve(kick) the watchdog timed correctly while Flash is disabled. So how can i handle this? Is it somehow possible to serve the Dog while in Standby Mode ?

 (I also tried to write a function to do this out of RAM without any effort because im at the IDLE instruction as long as there is no Wakeup INT.)