【正文】 ncy device selection 1 by the MCU to control the D / A output three kinds of waveforms. AT89C52 microcontroller is a highperformance 8bit single chip microputer. Which constitute the puter39。 digital tube for digital display。 4, the D / A analog output electric current through the op amp to convert the voltage waveforms generated by the microcontroller programming method through the DA converter module DAC0832 output into the filter wave amplification. Schematic 26 as follows: the design of the display module LCD 1602 display the output waveform, frequency, the circuit diagram. As shown in Figure 27, the 1602 data of the eight termination microcontroller P1 port, its three can end RS, RW, E, respectively, then the microcontroller. Through software control of the LCD screen can display the waveform types and frequency of the waveform. Conclusions The curriculum design allows me to deepen and improve the theoretical knowledge learned on the course. And through the course design, so that I understand and master microputer application system software and hardware design process, methods and implementation, training me to analyze problems and problemsolving skills, to lay a good foundation for the future design and implementation of the more difficult applications. At the same time trained me to write the design specifications. In the design process, I found a lot of problems before done such a design, but this design really made me grow a lot. Singlechip design, the hardware circuit is relatively simple, mainly is to solve the problem of program design, program design is a very flexible thing, it reflects you solve the problem of logical thinking and innovation capability, it is the soul of a design lies. Therefore, most of the time throughout the design process is used in the program above. Many subroutines can learn from books, but how the convergence of each subroutine is the key problem, which requires very familiar with the structure of the microcontroller. Therefore we can say that the single chip design is a bination of software and hardware, the two are inextricably linked. To design a successful circuit, must be patient, there must uphold the determination. , Spend the most time on the details of the design of each unit circuit connections and circuits, such as the choice of a variety of programs, we carefully pare the analysis of the principle as well as possible reasons for the circuit design process. This requires a full and thorough understanding and research, and the various ponent parts of the hardware system of flexible applications. Books of theoretical knowledge on the basis of the design is plete, I have a deeper understanding. The design process at the same time, I also learned to efficient data access, using reference books, use the Inter to find information. I found in the books we use have some knowledge in practical applications is not very satisfactory, various parameters need to adjust. Occasionally will encounter incorrect information to the phenomenon, which requires that we should pay more attention to the Practice. Deep understanding of the theory applied in practice, through the waveform on the puter, know and understand the theory in the puter how to perform the application of this theory in practice a deeper understanding, and inspired my enthusiasm for learning in the design of this course, I was through the course design, a prehensive system to understand the basic method of the general principles of piler principle course of the program structure. Rigid textbook knowledge bees interesting, inspired my enthusiasm for learning. References 1 A wearing fairy gold editor of 51 singlechip C language assembler development instance of Tsinghua University Press, 2020 2 High auspicious editor of the National Undergraduate Electronic Design Contest Training Series tutorial Electronic Industry Press, 2020 3 salicin line editor of Analog Electronics Concise Guide to Higher Education Press, 2020 4 Jiang Huiping editor Microcontroller Theory and Application Design of Beijing University of Aeronautics and Astronautics Press, 2020 基于 單片機的信號發(fā)生器的設計 黃鵬勇 （湄洲灣職業(yè)技術(shù)學院，福建 莆田 351254） 摘 要 波形發(fā)生器即簡易函數(shù)信號發(fā)生器，是一個能夠產(chǎn)生多種波形，如三角波、鋸齒波、方波、正弦波等波形電路。常用的信號發(fā)生器絕大部分是由模擬電路構(gòu)成的，當這種模擬信號發(fā)生器用于低頻信號輸出往往需要的 RC 值很大，這樣不僅參數(shù)準確度難以保證，而且體積和功耗都很大，而由數(shù)字電路構(gòu)