| 摘要 |
PURPOSE:To perform data transmission with the high degree of freedom by connecting data processors together via a data transfer request signal line, signal line for the transmission of the acceptable state of data, signal line for serial data transmission, and ground line. CONSTITUTION:Under the command of processor CPU of the data processing unit, FF1 is set and the signal of signal line IRQ for outputting a data transfer request is held at a low level via driver A2. Other data processing units receive this signal by receivers A1 and then input it to CPUs. In the data acceptable state, FF2 is set under the command of CPU and the signal of signal line DAR is held at a high level through driver A4, sending a data ready signal. In the transmitting data processing unit, CPU confirms that and sets one character among data read out of memory M in transmitting shift register TSR, thereby sending it via A6. |
