| 摘要 |
When data erasure of a flash memory is interrupted and restarted from the interrupted point, time required for the data erasure is shortened. A flash memory includes a memory cell(s), a verification circuit, and a power supply circuit. The verification circuit measures a threshold voltage of the memory cell(s) by verifying an erasure state of the memory cell(s). The power supply circuit applies, to the memory cell(s), one or more pulse voltages whose initial pulse voltage has a strength that corresponds to the measured threshold voltage.
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