| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve such a problem that a time required for automatic erasure is not shortened without improving a cell characteristic. SOLUTION: An erasure permission signal is set to erasure registers 37, 38 corresponding to a block to be erased. When an initial block is erased in accordance with the erasure permission signal set to the erasure registers 37, 38, all residual blocks being object of erasure are erased en bloc in accordance with the erasure permission signal set to the erasure registers 37, 38. Thereby, erasure is performed by a time of one block in erasure sequence of all blocks.</p> |
