Hello,
During the reset process, all port outputs will become inputs. What might work is to set the pin to a low output state at the start of your code, wait for a known amount of cycles, and clear the watchdog timer. Then set the pin to a high output state, and enter a wait loop until reset occurs. An external pullup resistor should be connected to the pin.
You should then observe the pin at a low state following initialisation. The pin will then become high when the full watchdog timeout commences, and should remain high when reset occurs and the pin becomes an input. Subtract the watchdog timeout period from the period that the pin remains high, and you should have the hardware initialisation period.
The process should repeat over and over, so you should be able to judge whether there is any variability of the timing.
Regards,
Mac
