【正文】 Endurance:1000 Write/Erase Cycles 2568 bit Internal RAM 32 Programmable I/O Lines Three 16Bit Timer/Counters Eight Interrupt Sources Programmable Serial Channel Low Pow er Idle and Power Down Modes ThreeLevel Program Memory Lock Fully Static Operation:0 Hz to 24 MHz Desc ription The AT89C52 is a low power,highperformance COMS 8bit microputer 11 w ith 8K bytes of Flash programmable and erasable read only memory(PEROM).The devic e is manufactured using Atmel39。 Therefore, the development of dedic ated single chip S OC trend of the natural form. As the microelectronics, IC design, EDA tools development, applic ation system based on MCU S OC design have greater development. Therefore, the understanding of the mic rocontroller chip mic roputer can be, extended to the singlechip microcontroller applications. 4 MCU applications At present,MCU to infiltrate all areas of our lives, which is almost difficult to find 9 traces of the field without SCM. Missile navigation equipment, aircraft, all types of instrument control, puter work munications and data transmission, industrial automation, realtime process control and data processing, extensive use of various smart IC card, civilian luxury car security system, video recorder, camera, fully automatic washing machine control, and programcontrolled toys, electronic pet, etc., which are inseparable from the microcontroller. Not to mention the area of robot control, intelligent instruments, medical equipment was. Therefore, the MCU learning, development and application of the large number of puter applications and intelligent control of the scientists, engineers. SCM is widely used in instruments and meters, household appliances, medical equipment, aerospace, specialized equipment, intelligent management and process control fields, roughly divided into the following several areas: （ 1） In the application of Intelligent Instruments SCM has a small size, low power consumption, controlling function, expansion flexibility, the advantages of miniaturization and ease of use, widely used instrument, bining different types of sensors can be realized Zhuru voltage, power, frequency, humidity, temperature, flow, speed, thickness, angle, length, hardness, elemental, physical pressure measurement. SCM makes use of digital instruments, intelligence, miniaturization, and functionality than electronic or digital circuits more powerful. Such as precision measuring equipment (power meter, oscilloscope, various analytical instrument). （ 2） In the industrial control application With the MCU can constitute a variety of control systems, data acquisition system. Such as factory assembly line of intelligent control,all kinds of alarm systems,and puter works constitute a secondary control system. （ 3） In the Appliance of Household appliances It can be said that the appliances are basically using SCM, praise from the electric rice, washing machines, refrigerators, air conditioners, color TV, and other audio video equipment, to the electronic weighing equipment, varied, and omnipresent. （ 4） In the field of puter works and munications applications MCU general with modern munication interface, can be easy with the puter data munication, working and munications in puter applications between devices had excellent material conditions, are basically all munication equipment to achieve a controlled by MCU from mobile phone, telephone, miniprogramcontrolled switchboards, building automated munications call system, train radio munication, to the daily work can be seen everywhere in the mobile phones, trunked mobile radio, walkietalkies, etc.. （ 5） Microputer in the field of medical device applications MCU in the use of medical devices is also quite extensive, such as medical respirator, the various analyzers, monitors, ultrasound diagnostic equipment and 10 hospital beds, etc. call system. （ 6） In a variety of major appliances in the modular applications Designed to achieve some special single specific function to be modular in a variety of circuit applications, without requiring the use of personnel to understand its internal structure. If music integrated single chip, seemingly simple function, miniature electronic chip in the (the principle is different from the tape machine), you need a puter similar to the principle of the plex. Such as: music signal to digital form stored in memory (like ROM), read by the microcontroller, analog music into elec