| 摘要 |
PURPOSE:To carry out both the reading of data to be calculated and the writing of the arithmetic result at a time by writing the arithmetic results of the output either one of two sets of memory cells and an external input. CONSTITUTION:A memory IC 1 contains two memory cell groups 2 and 3 of the same constitution, a selection circuit 4 which selects the output of both cell groups and an arithmetic circuit 5 having an output to be selected and an external input 101 defined as two inputs. The circuit 4 selects the output of the cell 2 or 3 in response to the input 101. This selected output undergoes an operation through the double input operator 5 together with the input 101. These arithmetic results are used as the inputs of both cells 2 and 3. Then data are written only to the memory cell different from that through which the data is read out in response to the signal 104.
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