| 摘要 |
A driving method by which stored data can be retained even with no power supply and the number of writing operations is not limited is provided. The variation of a writing potential to a memory element is suppressed to improve the reliability according to a new driving method. According to the driving method of a semiconductor device, in writing data, the writing potential is increased step-by-step while verifying the reading current, and the result of the reading current is used for the writing current. That is, data writing is performed while verifying whether data writing is performed with an accurate potential. Accordingly, data writing can be performed with high reliability.
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