| 摘要 |
PURPOSE:To shorten the required time of prescribed processing without increasing bit width unnecessarily by converting a part of a microsubinstruction into a subcode for specifying the items of composite operation in accordance with the value of a control code area. CONSTITUTION:When the value of the control code area 2 in the microinstruction 1 read out from a control memory is '11', a composite operation subcode 5 is transmitted to control parts for plural computing elements such as an 1-byte adder BA, an 8-byte adder PA and an 8-byte shifter SH and registers R1-R4. Each control part forms a control signal from the code 5 and finds out OR operation between the formed control signal and a control signal required for independent operation of each element out of respective computing elements and registers R1-R4. Consequently, respective computing elements and respective registers R1-R4 are controlled and the various operations of these elements are uniformly determined by one value of the code 5.
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