| 摘要 |
PURPOSE:To simplify the circuit constitution of an instruction processor by carrying out advance of an instruction address for the instruction processor via a numerical arithmetic part of an arithmetic unit and therefore eliminating an advance circuit. CONSTITUTION:The instructions 1 and 2 are defined as a logical arithmetic instruction and a numerical arithmetic instruction respectively together with addresses of a memory defined as (n) and (n+1) respectively. The instruction 2 is read out in the next instruction step by the address (n+1) stored in an instruction address register 9 and detected to be equal to a numerical arithmetic instruction. Thus the contents of the register 9, i.e., the address (n+1) is first sent to a numerical arithmetic part 2 and stored in the register 9 after advance arithmetic prior to execution of an instruction. The data D1 is read out to a numerical arithmetic part 2 in the next instruction step and processed there. The arithmetic result data D3 calculated by an arithmetic unit 1 with both instructions 1 and 2 is sent to a designated general-purpose register.
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