Watch-dog timer circuit and a microcomputer equipped therewith

Details Watch-dog timer circuit and a microcomputer equipped therewith Watch-dog timer circuit and a microcomputer equipped therewith

1994-04-20

1995-08-08

Wambach, Margaret Rose

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Measuring or testing

39518306, H01J 37305

Patent

active

054406030

ABSTRACT:
A watch-dog timer circuit including a counter which counts clock pulses of a microcomputer and a timer circuit which is refreshed in every period of the clock pulse, thereby to generate a request signal to reset a CPU by means of the counter when the counter overflows or underflows, and generate a request signal to reset the CPU by means of the timer circuit when the clock pulse stops, in order to monitor both uncontrollable operation of the CPU and the stop of oscillation of the clock pulses, and the micro computer equipped with the watch-dog timer circuit.

REFERENCES:
patent: 4586179 (1986-04-01), Sirazi et al.
patent: 4962352 (1990-10-01), Ogawa

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