1, microprocessor: refers to the fourth generation of large-scale, ultra-large scale integrated circuit CPU, is a simple hardware concept.
2. Microcomputer: refers to a computer whose CPU is composed of a microprocessor.
3, microcomputer system: refers to a complete computer system, is composed of hardware and software computer system. That is, the hardware is the whole of a microcomputer with a software system.
4, CPU: is a general term for all computer central processing units.
5, MCU: is the name of the performance scale classification, computer scale classification: mainframe, mainframe, medium-sized machine, minicomputer, microcomputer, single board machine, single-chip computer. In short: microprocessor, microcomputer refers to hardware, microcomputer system emphasizes the unified system of hardware and software, and emphasizes that hard and software are the overall indivisibility of computer system.