汉字LED显示装置的设计

论文编号:JD1038  论文字数:19632,页数:51

 摘 要
随着信息技术的发展，LED显示作为信息传播的一种重要手段，已经广泛的应用于大型商场、车站、码头、地铁以及各类办事窗口等公共场所，并取得了良好的效果。
 此装置用以MCS-8051单片机为核心芯片的电路来实现，硬件电路主要由MCS-8051单片机、可编程并行I/O口器件8255、时钟芯片DS12887、LED点阵驱动电路及外扩的存储器M29F040、键盘和串行通信电路组成。此装置能同时显示8个汉字，每个汉字是16×16的发光二极管构成的点阵，共采用32个8×8的LED模块构成发光点阵。LED点阵的驱动电路采用列扫描行驱动；在机内设置了字库，汉字可通过计算机写入或通过按键输入，并存于装置内。显示方式为动态扫描多屏轮换显示，根据汉字字数多少自动识别静止显示或左移动态显示，同时还具有时间显示功能。
 
 关键词： LED显示；单片机；驱动电路；时钟芯片DS12887 
 
  Abstract
 With the development of information technology, LED display as an important tool of information dissemination, has been widely used in major shopping malls, railway stations, docks, subway window and a variety of work and other public places, and have achieved good results.
 This device use MCS-8051 microcontroller as the core chip circuitry to realize, hardware circuits mainly by the MCS-8051 microcontroller, programmable parallel I/O port device 8255, the clock chip DS12887, LED dot-matrix drive circuit And the expansion of memory M29F040, keyboard and the serial communication circuit. This device can also showed that eight Chinese characters, each Chinese character is 16 × 16 LED dot matrix consisting of a total of thirty two by 8 × 8 LED modules of a luminous dots. The dot matrix LED drive circuit used to drive out scanning in the machines set up a character and write Chinese characters by computer or through the key input, both in the devices. Dynamic scanning for the display of multi-screen rotation, according to the number of Chinese characters Volume Automatic Identification static display or the left dynamic display, and also can display time.
 
  Key words: LED display; Single-chip-microprocessor; Driving circuit; Clock chip DS12887

 目 录
 第1章 绪论 1
1.1 选题背景 1
1.2 汉字LED显示装置的设计要求 1
 第2章 系统的总体设计 2
2.1 主要芯片的选择 2
2.2 硬件电路总体设计思路 2
 第3章 系统硬件电路的设计与分析 4
3.1 单片机最小系统 4
 3.1.1 8051单片机简介 4
 3.1.2 存储器接口电路 6
 3.1.3 8255与单片机的接口电路 8
3.2 LED驱动电路 10
 3.2.1 行驱动电路 10
 3.2.2 列扫描电路 11
3.3 LED点阵显示屏 12
 3.3.1 LED点阵的显示原理 12
 3.3.2 LED点阵阵列的构成 12
3.4 时钟电路 13
 3.4.1 时钟芯片DS12887 13
 3.4.2 DS12887与单片机的接口电路 17
3.5 键盘电路 18
3.6 串行通信接口电路 19
 第4章 系统的软件设计 21
4.1 程序设计语言的简介 21
4.2 主程序设计 21
4.3 键盘子程序设计 23
4.4 显示子程序设计 24
4.5 部分程序代码 27
 第5章 结论 31
 参考文献 32
 致 谢 34
 附录Ⅰ 外文及翻译 35
 附录Ⅱ 原理图 45
 附录Ⅲ 元件清单 47

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