| 摘要 |
The present invention provides a semiconductor device that includes a memory cell array that can be divided into four blocks. During a period in which data is read or written in one of the blocks, refreshing is conducted in all of the other remaining blocks. Also, in a standby state or in an operation state, refreshing for each of the plurality of blocks is performed with time differences provided therebetween, such that the peak current is lowered.
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