基于单片机的LED点阵显示屏的设计1.doc

河南工业职业技术学院 毕业设计任务书 类　别：　 专 业：　 班 级: 姓 名： 毕业设计题目：基于单片机的LED点阵 显示屏的设计 指导教师姓名： 负责人签字： 2010 年 11月 11日 摘 要 本设计是以单片机AT89S51为控制的LED点阵显示屏系统。 关键词：AT89S51； LED点阵显示 Abstract The design is based on AT89S51 microcontroller for the control of the lattice LEDs panel display system. The lattice LEDs panel display the basic working principle is a dynamic scan. Line scanning mode, each piece has a set of the lattice LEDs panel display tablets column driver circuit, a column driver circuit or shift register latch 74LS373 is used to latch the contents of the font data to be displayed. Line scanning mode, the same row of the lattice LEDs panel display tablets of the same name and the line control pin is connected to a line, a total of eight lines, the line driver circuit also has a latch or shift register 74LS373 is used to lock memory scanning signal. The lattice LEDs panel display tablets by the order on the screen, the microcontroller first row of the first film 1 LEDs panel display driver chip latches the column, write external data memory read from the font data, and then on the first two, Section 3 ... ... until the last piece of this row of font data are finished, the microcontroller then drives the line on this row write line scan signal latches, then ranked No. 1 in line 1 font data associated with light-emitting diodes lit. Then row 1 row 2, 3 row line 1 ... ... 1 until the last line of a row of lights. Single Chip LED display on the scan control line 2, line 3 ... ... until the scan control of the scan control line 8, line 1 of its process and control process of scanning the same. 8 lines of all the control process are completed, LED display will be done with the full frame display. Key words: AT89S51; lattice LEDs panel display 目 录 1 绪 论 1 1.1 课题背景 1 1.2 选题意义 1 1.3 课题设计目的 2 2 LED点阵显示屏系统需求分析 3 2.1 系统硬件方案 3 2.2 系统软件方案 9 3 LED点阵显示屏系统设计 12 3.1 硬件整体设计 12 3.2 译码电路设计 13 3.3 驱动电路设计 14 3.4 通信系统硬件设计 16 3.5 电源设计 17 3.6 系统软件设计 18 4