Memory backup circuit and memory backup method

Details Memory backup circuit and memory backup method Memory backup circuit and memory backup method

1995-09-05

1998-02-17

Nguyen, Viet Q.

Static information storage and retrieval

Powering

Data preservation

365226, 365227, 365228, G06F 118

Patent

active

057198160

ABSTRACT:
A change over unit 12 is controlled to become conductive only when useful data is stored in a memory 15 for storing data to be processed. Therefore, when a main power supply is shut off, a memory backup function of a backup battery 13 is operated only when useful data is stored in the memory 15, thereby preventing unnecessary backup, which results in preventing the backup battery 13 from unnecessarily discharging and realizing a reliable memory backup.

REFERENCES:
patent: 5157634 (1992-10-01), Dhong et al.
patent: 5186206 (1993-02-01), Jones
patent: 5251179 (1993-10-01), Wittman
patent: 5315549 (1994-05-01), Scherpenberg et al.

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