| 摘要 |
PURPOSE:To store more information and to allow CPU's access without increasing the number of signal lines by proving a module internally with storage holding parts more than write or read signal lines connected to a CPU. CONSTITUTION:Storage holding parts 16 and 17 are stored with write signals and also output their contents by being brought under read control. For the output, module selection signal lines 22 and 23 are used for one module. One of those two signal lines is used for a selection signal for the data writing and reading of the holding parts 16 and 17 and the other is used for the selection signal for a control part 24 which controls the storage holding parts. Consequently, the less signal lines allows an unshown CPU to access the input/output device having the holding parts A and B. |
