| 摘要 |
PURPOSE:To chain freely the processing sub-routine depending on the system constitution and to construct the free reversible system by taking out and executing the branch destination address in accordance with the order programed before. CONSTITUTION:When the branch pattern with special conditions is decoded as a microprogram language, the branch destination address is taken out and executed in accordance with the order programed beforehand. For example, data is read out from a microprogram control memory 10 in which microprograms 11-14 are stored, by means of the fixed procedure, and is stored in a microprogram register 20 and the output signal is stored in the address stack memory 30. Next, either the output data of the address stack memory 30 or the data from the address adder 60 or the data from the address decision circuit 90 are selected and outputted by a address selector 40. And, the address data from the address selector 40 is inputted in an address register 50 and the address of the control memory 10 is decided. |
