| 摘要 |
PURPOSE:To prevent data from being erroneously read out as the time of data interference with no hardware constitution complicated and also with no capacity of a RAM made small in a processing unit which transmits data between a plural number of control units and the RAM. CONSTITUTION:Under a certain control period when data written in a dual port RAM by a CPU is interfered with data read out of the dual port RAM by a CPU 2 (this represents the case of (a)), the interference is judged by the error frequency of data read out of the RAM and the like, so that data interference is avoided with the timing of the program of the CPU 2 shifted (this represents the case of (b)). And change in processing a plural number of interruptions in order at the time of data interference may be effective. |
