Electronic device having ferroelectric memory
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United States of America Patent
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Dec 15, 1998
Issued Date -
N/A
app pub date -
May 13, 1996
filing date -
Apr 13, 1993
priority date (Note) -
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Abstract
An electronic device maintains data utilizing a ferroelectric memory, not requiring a backup power source voltage. Data such as schedule data and telephone number data is stored in a ferroelectric RAM which switches between a dynamic mode and a nonvolatile mode. When a clock mode is designated by a 'CLK' key, a memory control circuit causes the ferroelectric RAM to be switched to the nonvolatile mode to maintain the data stored therein. When a schedule mode or a telephone mode is designated by means of a 'Sch' key or a 'Tel' key, the ferroelectric RAM is switched to the nonvolatile mode to write/read data therein/therefrom. When it is detected that a battery voltage is lowered or the battery is removed from the electronic device, the ferroelectric RAM is switched to the nonvolatile mode to protect the stored data.
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