Reset and watchdog system for a microprocessor, and appliance co

Details Reset and watchdog system for a microprocessor, and appliance co Reset and watchdog system for a microprocessor, and appliance co

1995-04-05

1997-10-07

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219452, 219481, 219494, 371 671, H05B 102

Patent

active

056744226

ABSTRACT:
A system comprising a microprocessor and a reset and watchdog circuit. The microprocessor generates a first pulse train (P1) to indicate the correct operation of the microprocessor and the reset and watchdog circuit generates a reset signal (RST) in response to an irregularity in the occurrence of the first pulse train. The first pulse train is a substantially synchronous software copy of a second pulse train (P2) which is received by the microprocessor and which is preferably a limited a.c. supply voltage signal. This copy is generated by an appropriate programming of the microprocessor. The reset and watchdog circuit receives the first pulse train (P1) and the second pulse train (P2) and supplies the reset signal (RST) in response to a disturbed synchronism between the occurrence of the first pulse train and the second pulse train.

REFERENCES:
patent: 4304003 (1981-12-01), Kakizawa et al.
patent: 4541050 (1985-09-01), Honda et al.
patent: 4580220 (1986-04-01), Braun et al.
patent: 4586179 (1986-04-01), Sirazi et al.
patent: 4685053 (1987-08-01), Hattori et al.
patent: 4745542 (1988-05-01), Baba et al.
patent: 4906979 (1990-03-01), Kimura

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