Watchdog timer that can detect processor runaway while processor

Details Watchdog timer that can detect processor runaway while processor Watchdog timer that can detect processor runaway while processor

1996-03-25

1997-01-14

Beausoliel, Jr., Robert W.

Excavating

371 61, 371 62, 39518509, G01R 3128, G06F 1100

Patent

active

055948650

ABSTRACT:
In a watchdog timer circuit for a system having a central processing unit and a storage unit, a watchdog timer is provided, which counts up to a predetermined counter value and generates an alarm signal for the central processing unit when the predetermined counter value has been reached. A reset unit is connected to the watchdog timer to periodically reset the watchdog timer in response to a first reset signal generated by the central processing unit, so that the watchdog timer is reset to an initial state. A data comparing unit is coupled to the storage unit to detect whether or not the storage unit is accessible and output a second reset signal to the watchdog timer each time it is detected that the storage unit is accessible.

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