The watchdog of an ATMEL ATXMega128 should have been enabled with fuses. It triggers a reset, if the timer was not reset within the configured time span. I want to be sure, that it is enabled and working properly.
What is a good method to verify that the watchdog is enabled and working on the finished PCB?
Is it common practice to prepare a spare input signal in order to trigger the watchdog artificially? Should the watchdog trigger, if I pull the external oscillator to GND, or will this stop the watchdog too?