| 摘要 |
PURPOSE:To execute calculation only with an instruction having a little bits such as one byte or the like by executing the instruction while using the register number of a register designating means in the case of executing the instruction omitting the designation of the register number. CONSTITUTION:This device is equipped with a register designating means 1 to store the designated storage area of a register 8, address designating means 2 to store address information and timing control means 5 to control the storage area, the selection of addresses and designated timing based on the instruction decoded by an instruction decoder 4. The designated storage area of the register 8 is stored in the register designating means 1 according to the register designating instruction, and the designated address is stored in the address designating means 2 according to the address designating instruction. In this case, when executing the instruction omitting the storage area designation and the address designation, the timing control means 5 selects the storage area and the address to be stored in the designating means 1 and 2. |
