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1、The development and application of MCS-51MCS-51 single-chip was producted in the United States INTE companies in 1980, and compared with MCS-48 single-chip the structure of it has more advanced and more powerful, in the original basis of the circuit an increase of more units and directive amounted t
2、o 111, MCS-51 single chip can be regarded as very successful product, until now, MCS-51 series or compatible single-chip applications is still the mainstream product, colleges and universities and professional schools, training materials remained in line with the MCS-51 single-chip, as the theoretic
3、al foundation for learning. We also carry out the representation of system models to explain. The range of MCS-51 single-chip 8031,8051 and 8751 mainly includes products such as GM, its main function is as follows: 8-bit CPU 4kbytes program memory (ROM) 128bytes of data memory (RAM) 32 Article I / O
4、 port 111 command line. Most of the 21 single-byte instruction register 2 dedicated programmable timer / counter interrupt source 5, a two-priority, full-duplex serial communication port to external data memory address space for external 64kB program memory address space for 64kB-bit addressing logi
5、c operation function 40PinDIP dual in-line package Single +5 V Power Supply MCS-51 with its typical structure and improve the special registers of the bus centralized management, operation of a large number of logic functions and bit-oriented control rich instruction set, called for the generation o
6、f crew, the other single-chip microcomputer for later laid the foundation for the development. Because of its superior performance and improve the structure, resulting in the subsequent many manufacturers use or make reference to more than its architecture, there are many of the worlds largest maker
7、 of electrical and enriched and developed the MCS-51 microcontroller, such as PHILIPS, Dallas, ATMEL, etc. well-known semiconductor companies are compatible with the introduction of the MCS-51 microcontroller products, and even Chinas Taiwan WINBOND also compatible with the development of C51 (it us
8、ed to be referred to as MCS-51 If there is no special statement C51, both with the mean MCS-51 Series single-chip) microcontroller varieties. C51 obtained in recent years the development of rapid, C51 origin INTEL as a result of the company was busy developing high-end PC and not on the microprocess
9、or to continue to develop their own single-chip, and by other manufacturers to its development, is the most typical PHILIPS and ATML company, PHILIPS mainly to improve its performance, based on the original development of the high-speed I / O port, A / D converter, PWM (pulse width modulation), WDT
10、and other enhancements, and low-voltage, micro-power consumption, extended serial bus (I2C) and control network bus (CAN) and other functions be improved. PHILIPS Corporation C51 in the development of low-power, high speed and enhanced functionality made many contributions to the development of its
11、first major C51 single-chip, they save 83Cxx and 87Cxx series of parallel expansion bus, suitable for control of household appliances as a category of single-chip microcomputer of the economy. ATMEL Corporation AT89Cxx introduced C51 range of compatible single-chip, to be perfectly Flash (non-volati
12、le flash memory technology) EEPROM with 80C51 core combine the use of C51 is still the overall structure and command system, Flash can be anti-erasable program memory can effectively reduce the development costs and allow for repeated use of single-chip microcomputer. Siemens also use the core of C5
13、1, C500 series has introduced single-chip, while maintaining compatibility with the C51 instructions under the premise of the performance of their products has been further improved, especially in the anti-interference performance, electromagnetic compatibility and communication control bus unique f
14、unctions, and their products are commonly used in the working environment of the occasion. Also applies to the field of telecommunications and home appliance control. WINBOND Taiwan companies have also developed a series of C51-compatible microcontroller, and its products typically have a wealth of
15、features, but also to its high quality and low price in the market also has a certain amount of points. 8051 is MCS-51 series single-chip representation of products. It integrated a powerful central processing unit, including the instruments used in multiplication and division hardware, control regi
16、sters 21 dedicated, 4kB the program memory, 128 bytes of data memory, 4 groups of 8 parallel port, two 16-bit can be programming timer / counter, a full-duplex serial port, as well as the Boolean processor. MCS-51 has a relatively large address space, address line width of 16, or external data memory and program memory addressing an area of 216 = 64kB, which is controlled as a single-chip is relatively large, which at the same time available on the I / O port access. In addit
