Only 2^13 or 2^18 modes. Max time = 16M / 262144 = 16.4ms.
I know maybe it's hopeless.
Yes, the watchdog only has two timers 2^13 or 2^18, but also you can disable it.
But I do not know what is your application where you need a long watchdog timer, do you plan to have more than 17 ms on the same task that you can not feed the dog.
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