【正文】 electrical mechanical servo drive control object. Semiconductor and integrated circuit technology will bring us a universal age of electronic technology, wireless technology as the field of electronic technology a part of. 70 years into the 20th century, large scale integrated circuit appeared to promote the conventional electronic circuit unitspecific electronic systems development. Many electronic systems unit into a dedicated integrated devices such as radios, electronic clocks, calculators, electronic engineers in these areas from the circuit, the system designed to debug into the device selection, peripheral device adapter work. Electronic technology, and electronic products enriched, electronic engineers to reduce the difficulty, but at the same time, radio technology, electronic technology has weakened the charm. The development of semiconductor integrated circuits classical electronic systems are maturing, remain in the large scale integrated circuit other thanthe shrinking of electronic technology, electronic technology is not the old days of radio fun times and prehensive engineering training. 3, from the classic era of electronic technology to modern electronic technology of the times 80 years into the 20th century, the century of economic change is the most important revolution in the puter. The puter revolution in the most important sign is the birth of the puter embedded applications. Modern puter numerical requirements should be born. A long period of time, is to develop the massive puter numerical duty. But the puter shows the logic operation, processing, control, attracting experts in the field of electronic control, they want development to meet the control object requirements of embedded applications, puter systems. If you meet the massive dataprocessing puter system known as generalpurpose puter system, then the system can be the embedded object (such as ships, aircraft, motorcycles, etc.) in a puter system called the embedded puter. Clearly, both the direction of technology development are different. The former requires massive data storage, handling, processing and analysis of highspeed data transmission。 while the latter requires reliable operation in the target environment, the external physical parameters on highspeed acquisition, analysis and processing logic and the rapid control of external objects. It will add an early generalpurpose puter data acquisition unit, the output driver circuit reluctance to form a heat treatment furnace temperature control system. This generalpurpose puter system is not possible for most of the electronic system used, and to make generalpurpose puter system meets the requirements of embedded applications, will inevitably affect the development of highspeed numeric processing. In order to solve the contradiction between the development of puter technology, in the 20th century 70s, semiconductor experts another way, in full accordance with the electronic system embedded puter application requirements, a microputer39。s basic system on a chip, the formation of the early SCM (Single Chip Microputer). After the advent of single chip in the puter industry began to appear in the generalpurpose puter systems and embedded systems the two branches. Since then, both the embedded system, or generalpurpose puter systems have been developed rapidly. Although the early generalpurpose puter converted the embedded puter systems, and real embedded system began in the emergence of SCM. Because the microcontroller is designed specifically for embedded applications, the MCU can only achieve embedded applications. MCU embedded applications that