Method for automatically resetting a microcomputer in a video ca

Details Method for automatically resetting a microcomputer in a video ca Method for automatically resetting a microcomputer in a video ca

1994-07-20

1998-03-03

Envall, Jr., Roy N.

Boots, shoes, and leggings

364131, 371 91, 360 69, G06F 1100

Patent

active

057242402

ABSTRACT:
In a video cassette recorder incorporating two interconnected microcomputers for its control, an automatic watchdog method sends from a first microcomputer a request command for watchdog data to a second microcomputer periodically. Upon receiving the watchdog data request command, the second microcomputer, if operating normally, is forced to respond to the watchdog data generated in a predetermined manner. Accordingly, when the first microcomputer receives the watchdog data generated not in the predetermined manner, or does not receive the watchdog data at all, it recognizes that the second microcomputer is in an errant state. When the first microcomputer detects such an abnormality in the second microcomputer, it reinitializes the second microcomputer through a reset port thereof.

REFERENCES:
patent: 4811200 (1989-03-01), Wagner et al.
patent: 4881227 (1989-11-01), Buhren
patent: 4882669 (1989-11-01), Miura et al.
patent: 5182683 (1993-01-01), Mitsuhashi

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