单片机课程设计 - 16×16点阵式汉字显示

目 录

摘要 .................................................................................................................................................. 1 Abstract........................................................................................................................................... 2 1设计原理........................................................................................................................................ 3

1.1 MCS-51单片机的结构及编程方法 .................................................................................. 3 1.2 16*16点阵LED原理 ........................................................................................................ 5 1.3 3-8译码器原理 ................................................................................................................ 6 2.设计方案介绍 ............................................................................................................................... 7

2.1 设计总体思路 ................................................................................................................... 7 2.2 与题目相关的具体设计 ................................................................................................... 7 2.3程序设计流程图 ................................................................................................................ 8 3.源程序，原理图和仿真图 ........................................................................................................... 9

3.1程序清单(见附录) ............................................................................................................ 9 3.2电路图 ................................................................................................................................ 9

3.2.1电路原理图 ............................................................................................................ 9 3.2.2电路图分析 ............................................................................................................ 9 3.3仿真图 ................................................................................................................................ 9 4性能分析...................................................................................................................................... 10 5.总结和心得 ................................................................................................................................. 11 6.参考文献..................................................................................................................................... 12

附录：程序代码 ..................................................................................................................... 13

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摘要

LED点阵显示屏作为一种新兴的显示器件,是由多个独立的LED发光二极管封装而成. LED点阵显示屏可以显示数字或符号, 通常用来显示时间、速度、系统状态等。文章给出了一种基于MCS-51单片机的16×16 点阵LED显示屏的设计方案。包括系统具体的硬件设计方案,软件流程图和部分汇编语言程序等方面。在负载范围内, 只需通过简单的级联就可以对显示屏进行扩展,是一种成本低廉的图文显示方案。

关键词：MCS-51；LED；单片机

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Abstract

As a popular display device component, LED dot-matrix display board consists of several independent LED (Light Emitting Diode). The LED dot-matrix display board can display the number or sign, and it is usually used to show time, speed, the state of system etc. This paper introduces a kind of simple 16ｘ16 LED display screen design process based on MCS-51 single chip minicomputer . The detail hardware scheme, software flow and assemble language programmer design and so on is followed. The display part can be cascaded to meet the need. The practice proves the design is low-cost and effective.

Key words: MCS-51；LED；MCU

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1设计原理

1.1 MCS-51单片机的结构及编程方法

MCS-51单片机的组成： CPU(进行运算、控制)、RAM(数据存储器)、ROM(程序存储器）、I/O口(串口、并口）、内部总线 和中断系统等。

8051单片机的组成框图

（1）cpu中央处理器

由运算器和控制器组成，是8位的cpu，具有布尔运算和8位寻址功能。运算器

完成算术运算和逻辑运算。CPU根据PC中的地址将欲执行指令的指令码从存储器中取出，存放在IR中，ID对IR中的指令码进行译码，定时控制逻辑在OSC配合下对ID译码后的信号进行分时，以产生执行本条指令所需的全部信号。 （2）存储器

MCS-51单片机按程序存储器可分为内部无ROM 型（如8031）和内部有ROM型（如8051）两种， 连接时 引脚有区别。程序存储器结构如右图所示： 程序存储器 ：一般将只读存储器（ROM）用做程序

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