【正文】 hardness, elements and pressures, physical measurement. Adopting SCM control makes instrument digital, intelligent, miniaturization, and functional than by electronic or digital circuit stronger. For example precision measuring equipment (power meter, oscilloscope, various analyzer). 2. The application in industrial control MCU can constitute the various forms of control system, the data acquisition system. For example the production line of the intelligent pipe principle, the elevator intelligent control, various alarm system, work with puter constitute a secondary control system, etc. 3. The application in household appliances It can be said that now of household appliances basically adopts singlechip microputer control, from electric cooker, washing machines, refrigerators, air conditioner, color television, other audio video equipment, arrive again microelectronic quantity equipment, multifarious, omnipresent. 4. In puter work and munication in the field of application Modern singlechip generally have munication interface can be easily and puter data munications, for in the puter work and munication between devices applied to provide the excellent material conditions of present munication equipment basically realized the singlechip microputer intelligent control, from mobile, telephone, small pabx, building automatic train munication calling system, wireless munication, arrive again daily work deductionsfrom the mobile phone, cluster mobile munications, radios, etc. 5. Microputer in the medical device field of application Microputer in the medical equipment of use also is quite widespread, such as medical breathing machines, various analyzer, monitors, ultrasound diagnostic equipment and sickbed call system, etc. 6. In various largescale electric appliance of modular applications Some special MCU designed to acplish a specific function, and in various circuit of modular application, without asking using personnel understand its internal structure. If music integrated microcontroller, seemingly simple function, miniature in pure electronic chip (different from the principle of tape) be plex resemble puter principle. Such as: music signals in digital form stored in memory (ROM), similar to read by micro controller, into analog signals (similar to the music sound card). In large circuit, this modular application greatly reduced volume and simplify the circuit and reduce the damage, the error rate, also facilitate replacement. 7. Microputer in the application fields of auto equipment Microputer in the automobile electronic application is very wide, for example in the car engine control, based on CAN bus automobile engine intelligence electronic controllers, GPS navigation system, abs antilock brakes, braking system, etc. In addition, microputer in the industry and merce, finance, scientific research, education, national defence aerospace and other fields have a wide range of purposes. First, energy feedback unit work principle On frequencyvariable speedadjustable system, when the motor load is a load of potential energy type such as oil pumping unit, mine hoist, etc。 And rolling mill, large longmen planer, spindle etc need fast brake class load, the motor is inevitably exists generating process, namely of motor rotor in external drag or load inertia maintain itself under the actual, making the motor speed is greater than the synchronous speed inverters, motor power will be issued by stored in inverter with dc bus filter capacitance, if you don39。 , energy feedback unit suitable to the large inertia load such as: fan, cement system pipe, dynamic balancing machines, centrifuge, etc。t achieve motor precision braking . Five. With the development of the technology of puter and control， the temperature control of electric heating furnace is being fully developed, the technology has been an important part of industry. To meet the requirement of industrial control, the thesis designs a system which is constituted of temperature detecting device, A/D conversion, monolithic processor keyboard and display apparatus, alarming circuit and D/A conversion based on the control of electric heating furnace. The thesis explains the principle, the concept of design, constitution and characteristic. Because of the great developing speed of automatic temperature controlling, the thesis try to explain the system in detail, and the thesis also reflect the direction of the development of temperature controlling system. This design controlled member is an electric heating stove, adds through the control in the resistance wire beginnings and ends voltage operating time operating time, es the average power which outputs to the resistance wire to perform to control. Automatic temperature control of the electric furnace is realized by a temperature control circuit of solid state relay on the basis of the singlechip puter. This article put PID algorithm applies in the resistance furnace temperature control system, elaborated PID controller design, the hardware constitution and the software design, have realized set of temperatures gathering and the control design proposal. This control system has such advantages as low cost .control accuracy, good reliability and good resistance to interference. application of single chip in electronic scale The development of the modern society has put forward higher request on weighing technology. The desktop electronic scales have been great application in mercial trade, but they have many shortings such as large volume, high cost, AC supply power and not cove nince to carry, so they are restricted to use. The usual portable scales are lever scales which are mostly used by residents, and spring balance which measure through pression or drawing of spring. They are being rejected for their big measuring errors. People have be