Watchdog timer and method for detecting abnormal operation...

Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability

Reexamination Certificate

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Details

C715S252000, C715S252000, C715S252000

Reexamination Certificate

active

06948103

ABSTRACT:
A counter counts pulses of a clock generated by an oscillator. A control register clears the counted value, in response to a reset signal sent from an external circuit. In the case where the counted value exceeds a limit value, an output control circuit outputs a reset signal for instructing to execute the reset process, to the external circuit. This reset signal is provided also to the control register. The control register controls the counter to count the pulses of the clock, in response to the reset signal. Then, abnormal operations occurring in the external circuit during the execution of the reset process can be detected.

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P. Charpentier, “Le Chien de Garde Appplique au Micorprocesseur”, Electornique vol. No.: 24, pp. 53-59, (19930.

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