SYNCHRONIZING METHOD OF PROGRAM COUNTER

摘要

PURPOSE:To attain synchronization even in a low speed communication circuit by generating a synchronizing signal only when a logical device in a microcomputer system accesses an input system control device to synchronize a program counter. CONSTITUTION:Data are inputted from an input system device 6 of an optional microcomputer asynchronously with a logical device 3. The data are sent to an input system device connector 7 through a signal line 13, synchronously outputted to all microcomputers and stored in buffer memories of all I/O system control devices. When the start instruction data of an application program AP previously distributed from a certain system to respective system are inputted, the data are inputted to logical devices 3 of all the microcomputers and the same AP is loaded and started from the I/O system devices 5 of respective systems. The program counter of the logical device 3 is synchronized with the access of the input device by a synchronization control device 9 and a synchronization control device connector 10.