[shabble]

A more specialised variant that's also quite common is the "window watchdog" peripheral, which is similar to the timer version, but will also trigger a reset if the keep-alive signal arrives too early, as well as too late.

It can be useful where you've got a mainloop doing some very predictably timed activities, and allows detection of faults which cause your watchdog servicing to occur too frequently.

I think it's quite common in DSP and things like motor control, where you often have hard realtime requirements and things happening too soon is just as bad as too late.