| 摘要 |
An information processing system includes an instruction decoder part for decoding an external instruction signal and for outputting a control signal for executing an instruction based on a decoded result, and an operation part for carrying out an operation based on the control signal and for outputting an operation result. The operation part includes an operation unit which carries out an arithmetic logic operation and outputs the operation result, a flag register for holding states related to the operation result based on the control signal, and a buffer for successively holding predetermined states related to the operation result. The operation unit carries out the arithmetic logic operation by selectively reading the states held in the flag register and the buffer.
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