Apparatus controlled by a micro-computer and including power los

Details Apparatus controlled by a micro-computer and including power los Apparatus controlled by a micro-computer and including power los

1986-08-20

1988-06-07

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358190, 358903, 455185, 365229, H04N 544

Patent

active

047500409

ABSTRACT:
Apparatus for use in a television receiver of the kind controlled by a micro-computer is intended for the situation in which power failures occur and specifically where instantaneous power failures occur and shortly thereafter the power is recovered, in which it is determined whether or not the time display data stored in a memory of the micro-computer is correct and, if so, such data is continued to be refreshed and is used for the time display, whereby a backup circuit is simplified in construction, and even eliminated in some cases. The main television receiver control data are stored in a nonvolatile memory when a power interruption occurs, but are only used to refresh the random access memory of the micro-computer in those instances where the power outage exists for a period of time long enough to erase the time display data retained in the random access memory, a condition that is determined by checking such time display data each time it is necessary to reset the central processing unit of the micro-computer in view of a drop in line voltage.

REFERENCES:
patent: 4281349 (1981-07-01), George
patent: 4545068 (1985-10-01), Tabata

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