| 摘要 |
PURPOSE:To shorten a data processing time by securing such constitution a direct memory access controller DMAC carries out frame switch processing for changes of data storing addresses, etc., based on the data supplied from a serial channel. CONSTITUTION:A signal line is provided to inform the recognition of data showing the end of a frame serving as a group of information to be exchanged to a DMAC containing a chain function when said data is recognized by a serial channel SIC. The data are divided for each frame and transferred recognizably to a memory DM from a channel SIC. In this case, the DMAC carries out the frame switch processing for changes of the data storing address based on the data given from the signal line. Thus no intervention of a CPU is needed and the data processing time is extremely shortened. |
