Backup battery switching circuitry for a microcomputer or a microprocessor
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United States of America Patent
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Mar 13, 1990
Grant Date -
N/A
app pub date -
Mar 10, 1988
filing date -
Mar 10, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Backup battery switching circuitry for a microcomputer or a microprocessor includes circuitry for selectively coupling a backup battery to a power supply output terminal of the microcomputer or microprocessor for powering an external circuit such as a static RAM. The backup battery voltage is normally coupled to the power supply output terminal in the absence of a primary power source, but may be isolated from the power supply output terminal when a predetermined voltage is applied to a logic input pin and a predetermined sequence of events is executed by the microcomputer or microprocessor.
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