| 摘要 |
PURPOSE:To eliminate the need for a flag control and to facilitate the processing of a program by controlling a flag memory by a flag control circuit and automating the deciding of a flag and the setting and releasing of the flag to the access of the memory. CONSTITUTION:A flag in a flag memory 14 is provided corresponding to respective entries of a memory 13, selected by an address to the memory 13 from an address register 11 for a CPU 1 or an address register 12 for a CPU 2 and accessed by a flag control circuit 5. The flag control circuit 15 decides whether or not writing can be executed and reading can be executed by the flag on the flag memory 14 to the writing access from the CPU 1 to the memory 13 or the reading access from the CPU 2 to the memory 13, outputs the signal concerning the possibility or impossibility and controls the setting and resetting of the flag. |
