At present, single-chip computers have penetrated into all fields of our life, and it is almost difficult to find any field without traces of single-chip computers. The navigation device of missiles, the control of various instruments on the aircraft, the network communication and data transmission of computers, the real-time control and data processing of industrial automation processes, various intelligent IC cards widely used, the safety assurance system of civil luxury cars, the control of video recorders, cameras, automatic washing machines, program-controlled toys, electronic pets, etc