| 摘要 |
PURPOSE:To execute an efficient access by first reading the contents of a status register with the data processor of one side, and writing condition data only when a flag is not raised. CONSTITUTION:A data processor 1A of one side forcibly, so to speak, writes condition setting data to a data register 5 and sets the flag to a status register 7. To such operation, a data processor 1B of the other side, when it writes the condition data to the register 5, first reads the contents of the register 7, for example, and writes the condition data only when the flag is not raised. In the processor 1A of one side, a condition reading mechanism 9 reads the condition data which are the contents of the register 5. Thus, concerning the access by the data processor of one side, an efficient processing can be executed. |
