| 摘要 |
PURPOSE:To use as it is software which has been developed already, by adding hardware for converting automatically a word transfer command to a byte transfer command of plural times. CONSTITUTION:In case of write operation, by the first write command, an output (ADR/DAT7-0) of a microprocessor (muCPU)1 passes through a bidirec tional drive 5 and it is written on a memory I/O11 and a memory I/O which has been connected to a system bus. By the second write command, an output (ADR/DAT15-8) of the muCPU1 is written on the memory I/O11 through a bidirectional bus driver 4 and a bidirectional bus driver 9. By this operation, write data of 16 bits is divided into two times of 8 bits each and written on the memory I/O11. That is to say, the command is outputted two times, and as a result, a word transfer command is converted to a byte transfer command of 2 bytes.
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