【正文】 芯片chip Richard, elevator intelligent control, various alarm system, and puter networking constitute a secondary control system, etc. 3. The application in household appliances It can be said that now of household appliances basically all adopted MCU control, from electric cooker, washing machines, refrigerators, air conditioner, TVS and other audio video equipment, electronic equipment, again to amount is multifarious, omnipresent. 4. In puter network and munication field application Modern singlechip generally have the munication interface can be easily and puter data munications, for in puter network and munication between devices applied to provide the excellent material conditions, now of munication equipment basically all realized microcontroller intelligent control, from mobile, telephone, small pabx, building automatic munication call system, train wireless munication, to daily work ubiquitous mobile phone, cluster mobile munications, radios, etc. 5. Microputer in the medical device field application The USES of microputer in the medical equipment is quite widespread, such as medical also breathing machine, 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, thus in the various circuits for modular application, and not require staff know its internal structure. If music integration microcontroller, deceptively 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 applications have greatly reduced volume, simplified the circuit, reduced damage, the error rate, also facilitate replacement. 7. Microputer in the application fields of auto equipment The application of microputer in the automotive electronics is very extensive, for example, in the car engine controller based on CAN bus automobile engine intelligence electronic controllers, GPS navigation system, abs antilock brake systems, 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.16。s designated address, the corresponding unit from the ROM mand byte out of storage on the instruction register, and then, in the instruction register decoder instruction code has been translated into various forms of control signals, these signals with a single Machine clock oscillator clock pulse generated in the timing and control circuit in bination to form a certain period of time according to changes in level and beat the clock, the socalled control of information, internal coordination in the CPU data transfer between registers, and other puting operation. A program memory Control puter program is a series of action mands, singlechip only recognized by the 0 and 1 consisting of machine code instructions. Such as the preparation of the foregoing order by Mnemonic MOV A, 20H, understanding the code into the machine 74H, 20H: (written in binary is 01110100B and 00100000B). Deal with problems in the singlechip will be required before good procedures, tables, constants piled into machine code into the microcontroller memory, the memory as the program memory. Program memory can be put on the chip or chip, chipchip can also be set at the same time. As the PC program counter for 16bit, the program memory 16bit binary address can be used, therefore, the largest internal and external memory addresses from 0000H to FFFFH. 8051 there are 4k bytes of ROM, on the occupied by the 0000H ~ 0FFFH minimum 4k bytes, this chip to expand the program memory address 1000H numbers should be started, if you use 8051 as a 8031, do not want to use chip 4kROM , all bychip memory, the address number can be started by the 0000H. However, this should be the first 8051 feet (31) (that is, EA feet) remain low. When EA is high, the user 0FFFH in the range of 0000H to use the internal ROM, more than 0FFFH, the singlechip CPU access to external program memory automatically. Second, data storage Singlechip data memory RAM memory by reading and writing ponents. Its maximum capacity can be expanded to 64k, used to store realtime data input. 8051 there are 256 units of the internal data memory, in which 00H ~ 7FH for internal random access memory RAM, 80H ~ FFH register for the special zone. Actual use should be the first full use of internal memory, from the use of perspective, to understand the structure of internal data memory and address of the distribution is very important. Because the future directions in the study design of systems and procedure