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目 录

1 绪论.............................................................................1
2单片机概述........................................................................2
2.1单片机的特点及发展概况...........................................................2
2.1.1单片机——微控制器嵌入式应用的概念............................................2
2.2 单片机的历史与发展............................................................4
2．2．1单片机的发展概况............................................................4
2.2．2 MCS-51系列单片机............................................................5
2.2.3 80C51系列单片机..............................................................6
3 总体设计方案.....................................................................7
3.1 单片机选型.....................................................................7
3. 2 三极管........................................................................7
3.2.1结构分析......................................................................7
3.2.2三极管的特性曲线..............................................................8
3.2．3三极管的工作原理..............................................................9
3.3 LED发光二极管.................................................................10
3.3.1LED概述......................................................................10
3. 4总体设计及系统原理............................................................12
4 硬件设计......................................................................13
4. 1 单片机部分...................................................................13
4.1.1 AT89S52单片机...............................................................13
4.1.2 单片机硬件资源分配..........................................................14
4.2 电源与复位和晶振电路部分.......................................................14
4.2.1 电源与复位电路部分..........................................................14
4.3 按键控制部分..................................................................16
4.4 图案文字显示电路部分........................................................17
5 软 件 设计.....................................................................18
5.1 编程软件及汇编语言.............................................................18
5.2 主程序设计与程序分析...........................................................19
总 结...........................................................................21
致谢.............................................................................22
参 考 文献.......................................................................23
附录.............................................................................24

摘 要
根据单片机的特点及LED发光二极管亮灭在实际中运用的特点，本文提出一种用单片机控制LED亮灭的方法，从而显示出用LED拼凑的桃心图案和文字图案。同时给出了软硬件设计方法，设计过程包括硬件电路设计部分和程序设计部分。通过对元件的设计选择，最终选用AT89S52型号的单片机，对单片机的引脚结构功能进行了详细的概述。本文用红、黄、绿三色LED分别拼凑了三个图案(桃心)、两个汉字（汶川）、三个数字（512）。单片机的接口P2.0、P2.1、P2.2分别和三个桃心连接、P2.3、P2.4和两个汉字连接、P2.5、P2.6、P2.7和三个数字连接，通过程序给单片机的P2的八个接口付与1或0的高低电平使单片机外部所连的LED点亮或熄灭，INT0外部中断0为单片机P3.2口和一个外部外部按键信号接P3.3口，通过中断程序改变图案、文字、数字的循环点亮熄灭方式。

关键词：单片机; LED; 图案文字数字显示；软硬件；外部中断

Abstract

According to the microcontroller features and LED light-emitting diode-out in practice the use of the features of this paper, a microcontroller with the anti-LED control method, which shows that use LED patchwork of peach heart logo and text logo. At the same time given the hardware and software design, hardware design process, including design and part of the design process. Through the components of design options, the final choice of AT89S52 models of SCM, the MCU-pin structure and function carried out a detailed outline. In this paper, with red, yellow and green three-color LED of the three designs were put together (peach heart), two Chinese characters (Wenchuan), the number three (512). SCM interface P2.0, P2.1, P2.2 respectively, and three peach heart connection, P2.3, P2.4 and the two Chinese characters connect, P2.5, P2.6, P2.7 and 3 Digital connectivity, through the procedures to the eight SCM P2 interface with the pay of 1 or 0 low to high external MCU by the LED light or even extinguished, INT0external interrupt for the SCM P3.2 I 0 And an external signal to an externalbutton P3.3 mouth, through the interruption procedures to，changepatterns,text,figures out of the circle lit way.

Key words: MCU ; LED; logo for digital display, hardware and software; external interrupt

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