Comment Re: if they can't make them stop hallucinating (Score 2) 54
Not necessarily a capacitor; sometimes a little counter circuit, on the MCU but independent of the CPU and not controllable (or vetoable) by it. In either case, not prone to systemic failures of the higher-level logic.
People overestimate the difficulty of adding low-level contingencies to high-level systems, and underestimate engineers' eagerness to do so. But this is the sort of thing that EEs worry about all the time.