| 摘要 |
PURPOSE:To increase the data transmission efficiency, by performing the data transmission request from a master module independently of a reception of response to a transmission data. CONSTITUTION:A transmission program PG49 is started from a transmission data 11 to a master module MDL3, a transmission request processing 13 is executed, a transmission request 19 is given to a transmission/reception MDL5 and the system is in wait state 17 until a transmission request reception end interruption 51 is received. The interruption 51 is given with the end of the processing 47 and the state 17 is released. In the MDL5, a transmission/reception MDLPG10 is executed, a DMA is started and transmission data frames 40-44 are transmitted to a transmission line 7 one after another. When a reception response frame 45 is received via a reception line 8 to the frames 40-42, the PG10 executes a reception response processing 28 and the release of the transmission buffer is communicated to the MDL3 with a reception response interruption 53 and data transmission can continuously be made. |
