| 摘要 |
PURPOSE:To detect which slave device has transmitted a processing request signal without reading the status information of each slave device by detecting which slave device has transmitted the processing request signal by means of a processing request detecting circuit. CONSTITUTION:A processing request signal 7 and data are inputted from respective slave devices 21 to 2n to a processing request detecting circuit 3, and sent out to a master device 1. Further, a data selector circuit 4 outputs the data from the master device 1 to the respective slave devices 21 to 2n by data selective information 5 outputted by means of the processing request detecting circuit 3. The processing request detecting circuit 3 sends the processing request signal 7 to the master device 1 when the processing request from the slave devices 21 to 2n is detected, the circuit 3 judges which slave device has transmitted the processing request signal, and sends the data selective information 5 to the data selector circuit 4. Thus, without reading the status information of the respective slave devices 21 to 2n, which slave device 21 to 2n has sent the processing request signal 7 can be detected. |
