| 摘要 |
PURPOSE:To execute instructions designated by the instructions next to the microinstruction which is being executed at present by providing a clock generation circuit generating two clock signals whose phases differ and supplying one clock to a counter for generating addresses and the other to a register storing program outputs. CONSTITUTION:The titled circuit consists of a memory 1 in which a microprogram is stored, the counter 2 which synchronizes the address of the program with the clock signals from outside and outputs them, the pipe line register 3 which synchronizes the outputs from the memory 1 with the clock signals from outside and stores them, a counter control circuit 5 controlling the counter 2 based on the content of the register 3, and the clock generation circuit 4 generating two clock signals whose phases differ. One of two clocks is caused to be inputted to the register 3, and the other to the counter 2. Since the address of the instruction executed next to the optional microinstruction is outputted from the counter 2 after the microinstruction appears in a register output, program control is shifted just after the instruction which has designated it.
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