| 摘要 |
PURPOSE:To attain execution of plural working modes by using the control memories which store plural different microprogram groups. CONSTITUTION:The address produced by an address producing circuit 13 is taken into an address register AR12. The control memories 11-1-11-n store the different microprogram groups in order to attain the desired working modes respectively and also have a common address space. When the addresses are designated to memories 11-1-11-n by the register AR12, the contents of these designated addresses are outputted at a time and supplied to a selecting circuit 14. The circuit 14 selects a microinstruction given from the memory designated by a register 15 among those memories 11-1-11-n. Thus the degree of freedom is increased for setting function of each working mode required to a data processor.
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