PURPOSE: To surely and previously prevent the generation of malfunction without using a software means by holding an access request only for a reaccess request delay time even when an access request to a resource connected to another private bus ends. ;CONSTITUTION: When a processor 1a tries to execute accessing processing continuously two times to a memory 3 connected to the private bus 2b of the other processor 1b in order to increase/decrease a data value, the access right of the bus 2b is not transferred to the processor 1b even when a fixed time exists between respective accessing processing and an access request signal (d) is reset within the fixed time when the time is less than the previously determined reaccess delay time. Since the processor 1b does not execute accessing processing to the memory 3 within the mutual accessing processing, data to be accessed by the processor 1a can be previously prevented from being accessed by the interruption of the processor 1b in error.;COPYRIGHT: (C)1993,JPO&Japio
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