SEMICONDUCTOR DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor memory device with a novel structure that is capable of retaining memory contents under no-power condition (i.e., nonvolatile) and has no limitation on the number of times of writing.SOLUTION: A semiconductor memory device comprises: a memory cell array in which a plurality of memory cells are arranged in a matrix shape; a decoder for selecting a memory cell to perform operation from among the plurality of memory cells depending on a control signal; and a control circuit for selecting whether to output the control signal to the decoder. In addition, each of the plurality of memory cells retains data by turning off a selection transistor whose channel region is formed by an oxide semiconductor.SELECTED DRAWING: Figure 1