| 摘要 |
PURPOSE:To improve the processing of a microprocessor by making collectively judgeable the flags of plural arithmetic results only by one instruction. CONSTITUTION:Data are temporarily stored in a temporary register 2 through an internal bus 6, arithmetic logic between the data stored in the register 2 and data stored in an accumulator 1 is executed by an arithmetic unit 3, the logic operation result is stored in the accumulator 1 and a flag flip flop(FF) 4 is set/reset to store flags for one instruction. While shifting a flag in each execution of an arithmetic logic instruction, the flag is inputted to a flag shifting register 5 to store the flags of plural arithmetic logic instructions. The parallel outputs of the register 5 are applied to an arithmetic object in the unit 3 through the bus 6, the flags of plural arithmetic logic instructions are processed by the instructions and the final result is stored in the FF 4. |
