| 摘要 |
PURPOSE:To perform the transfer of data between memories with a single reading action by writing data read out of one of both memories on the other memory simultaneously with said reading action. CONSTITUTION:A reading mode is indicated on a memory control circuit 3 of a memory 5 which is read by a microprocessor 1 before data are transferred to a memory 5' from a memory 5. At the same time, a writing mode and a writing address are indicated on a memory control circuit 3' of a memory 5' which is written by the processor 1. Then the processor 1 reads the memory 5 and outputs a reading address to a common bus 2 together with a reading signal 6 for transfer of data. The circuit 3 set in a reading mode controls the memory 5 with a memory control signal 4 and outputs the read data to the bus 2. While the memory 3 indicating a writing mode writes the data on the bus 2 on the writing address of the memory 5' with the memory control signal 4' and then updates the writing address.
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