徐 州 工 程 学 院 毕 业 设 计 (论 文 )
目 录
1 绪论 .....................................................................................................................................1
1.1 单片机概述 .................................................................................................................1
1.2 LED 点阵数码显示屏概述 ..........................................................................................3
1.2.1 LED 的简介 ...........................................................................................................3
1.2.2 点阵的概述 ..........................................................................................................3
1.3 LED 点阵数码显示屏的前景和发展 ..........................................................................3
2 硬件介绍 .............................................................................................................................4
2.1 MSC-51 系列 89S51 单片机 ........................................................................................5
2.1.1 89S51 单片机的内部结构 ...................................................................................5
2.1.2 MCS-51 的引脚说明 .............................................................................................7
2.2 带锁存器输出的 8 位移位寄存器 74HC595 ..............................................................8
2.2.1 输出能力 ..............................................................................................................8
2.2.2 引脚说明 ..............................................................................................................8
2.2.3 功能表 ..................................................................................................................9
2.3 8*8 的 LED-1588 点阵模块 ........................................................................................9
2.3.1 产品内部电路图 ................................................................................................10
2.3.2 PIN 连接说明 .....................................................................................................11
2.3.3 产品描述 ............................................................................................................12
3 硬件设计 ...........................................................................................................................15
3.1 硬件设计主框图 .......................................................................................................15
3.2 LED 显示屏的驱动原理 ............................................................................................15
3.3 1588 8*8LED 点阵连接成显示屏的硬件连接 ........................................................16
3.4 单片机与 74HC595 的硬件连接 ...............................................................................16
3.5 89S51 单片机、显示模块及驱动模块的硬件连接 ................................................18
4 软件设计 ...........................................................................................................................19
4.1 显示原理 ...................................................................................................................19
4.1.1 LED 的显示原理 .................................................................................................19
4.1.2 点阵的显示原理 ................................................................................................20
4.2 设计思路 ...................................................................................................................21
4.3 16 点阵字库字模的提取 ..........................................................................................23
4.4 扫描输出框图 ...........................................................................................................27
4.5 主程序流程图 ...........................................................................................................27
4.6 程序清单 ...................................................................................................................29
