| 摘要 |
PCT No. PCT/JP84/00534 Sec. 371 Date Jun. 25, 1985 Sec. 102(e) Date Jun. 25, 1985 PCT Filed Nov. 8, 1984 PCT Pub. No. WO85/02277 PCT Pub. Date May 23, 1985.The present invention includes a suboperation code control memory which stores data for generating a heading address of a microprogram for an instruction having a suboperation code. Access to an operation code control memory by the ordinary operation code and the access to suboperation code control memory are carried out simultaneously. The heading address of the microprogram is generated by editing the data read from the respective control memories. The storage capacity needed for the suboperation memory is reduced and still no problem occurs in assigning microinstruction addresses, and the heading address of a microprogram for the instruction having a relevant suboperation code is produced without any additional time.
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