1. A system large scale integrated circuit (LSI), comprising: a basic instruction processor; at least one dedicated instruction processor; a bus that connects the basic instruction processor and dedicated instruction processor; and a system controller that controls the basic instruction processor and at least one dedicated instruction processor, the system controller including a decoder that decodes instructions fetched by the basic instruction processor to control the operation of the at least one dedicated instruction processor by operation of a power supply controlling unit, a clock signal generating unit, and program counter coupled to the at least one dedicated instruction processor.