Monitoring system with microprocessor and watchdog circuit monit

Details Monitoring system with microprocessor and watchdog circuit monit Monitoring system with microprocessor and watchdog circuit monit

1988-03-17

1990-03-06

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340505, 340516, 34082516, 364185, 324535, G08B 1314

Patent

active

049069799

ABSTRACT:
A monitoring system for an electronic instrument includes within itself a microprocessor and a watchdog circuit each provided with its own oscillator which generates a clock pulse and operating on the basis of this clock pulse. The watchdog circuit transmits a periodic interrupt pulse to the microprocessor which transmits a response pulse to the watchdog circuit in return. The watchdog circuit monitors the operation of the microprocessor by measuring the phase difference between the interrupt and response pulses and the microprocessor monitors the operation of the watchdog circuit by measuring the period of the interrupt pulse.

REFERENCES:
patent: 3753086 (1973-08-01), Shoemaker, Jr.
patent: 3838419 (1974-09-01), McSorley et al.
patent: 4187415 (1980-02-01), Boutmy et al.
patent: 4456906 (1984-06-01), Roach, Jr.
patent: 4482895 (1984-11-01), Weinberg
patent: 4581700 (1986-04-01), Farnham et al.
patent: 4593273 (1986-06-01), Narcisse
patent: 4749871 (1988-06-01), Galvin et al.

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