The present invention relates to a method of executing a command of PIEC. In the past, when a software command is discriminated during execution of a hardware command, the PI outputs a discrimination signal to the CPU. As a result, the CPU decodes the inputted command by software,;In consideration of this point, according to the present invention, two jump blocks for performing a software instruction and a hardware instruction are provided, and when a software instruction is determined, the address of a instruction to be executed is stored in the jump block, and the software block is executed simultaneously with the jump block being enabled Eliminates overhead and operates at high speed.
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