| 摘要 |
PURPOSE:To simplify both of logical and numerical operation programs by providing a data bus control circuit with a control part whose state is designated by a microprocessor and a means which rotates bits in accordance with the state of the control part. CONSTITUTION:Operation is started to read out data in address 8000H out of data of a memory 2 or an input/output interface 3 to a register A of a microprocessor 1 through data bus lines 19 and 20 and a transceiver circuit of a data bus control circuit 18. At this time, the data address viewed from the processor 1 is 8000H and is in a prescribed form. Contents of the register A are written in the data area of address 3000H in the memory 2 or the input/ output interface 3 through data bus lines 19 and 20 and the transceiver circuit of the data bus control circuit 19. Operation is terminated then, and as the result, data stored in address 8000H of the memory 2 is stored in the storage position of address 3000H in a prescribed form. |
