| 摘要 |
PURPOSE:To execute the processing of a program by a processor part by providing a byte width change means to change the byte width of transferred data to one byte width according to an instruction to indicate the byte width outputted from the processor part. CONSTITUTION:When data 23 with 4 byte width sent from an external device 11 is inputted to a byte width change circuit 14, it is changed to the one with one byte width by a one byte width selection signal 22. Data 24 with one byte width is written on a buffer 13-4 in a data buffer part 13 according to the indication of the one byte width selection signal 22. At this time, a data buffer output selection signal 25 is sent from a byte width selection circuit 17 to the buffer part 13, and the data written on the buffer 13-4 is read out. When the selection signal 25 is inputted to the buffer part 13, the data with one byte width written on the buffer 13-4 is outputted to the processor part 15 as data 26 with one byte width. Therefore, it is possible to perform data handling by the processor part without decreasing speed in data transfer. |
