Automatic resetting of control system for loss of functionality

Details Automatic resetting of control system for loss of functionality Automatic resetting of control system for loss of functionality

1980-10-30

1983-10-04

Heckler, Thomas M.

Boots, shoes, and leggings

219492, 34030915, G06F 1130, H05B 102

Patent

active

044082991

ABSTRACT:
An electronic control system, as for instance a microcomputer in a microwave oven, is automatically reset when a signal, normally provided by the microcomputer within some normal interval relative to some reference, fails to occur. A reset command signal is generated and resets the microcomputer to some initial point from which normal operation may begin or resume and at which certain output loads may be rendered inoperative. A display device associated with the appliance is repetitively scanned at some normal interval and may provide the monitored signal. Circuitry capable of generating a reset-command signal is inhibited by the occurrence of a transition attending the display scan signal so long as it recurs within the particular interval. A timing capacitor is reset, as by being discharged, each time a transition attending a display scan signal occurs. If the capacitor is not reset, the voltage thereon ultimately attains a level which results in the generation of the reset command. Repetitive time-spaced reset commands may also be provided to insure success of the resetting operation. This reset command generating circuitry may be independent of and external to the microcomputer.

REFERENCES:
patent: 4011428 (1977-03-01), Fosnough et al.
patent: 4158432 (1979-06-01), Van Bavel
Smith, L., "A Watchdog Circuit for UC-Based System", Digital Design, Nov. 1979, pp. 78-79.

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