| 摘要 |
A precharge circuit is provided between bit lines, on the one hand, and a power source potential on the other. The precharge circuit is controlled to be conductive/nonconductive by a clear signal. A control unit is also provided, which controls a decoder when the clear signal is supplied so as to set all the word lines in a selective state. In a clear mode, writing circuits write the same data simultaneously into all of the memory cells.
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