基于單片機控制文字的顯示

電子機電論文編號:JD144  字數(shù):13491,頁數(shù):29

目  錄

1 緒論 .............................................................................1
2單片機概述........................................................................ 2
2.1單片機的特點及發(fā)展概況...........................................................2
2.1.1單片機——微控制器嵌入式應用的概念 ............................................2
2.2  單片機的歷史與發(fā)展 ............................................................4
2．2．1單片機的發(fā)展概況 ............................................................4
2.2．2 MCS-51系列單片機 ............................................................5
2.2.3  80C51系列單片機..............................................................6
3 總體設計方案................................................................ .....7
3.1 單片機選型..................................................................... 7
3. 2 三極管........................................................................ 7
3.2.1結(jié)構(gòu)分析...................................................................... 7
3.2.2三極管的特性曲線 ..............................................................8
3.2．3三極管的工作原理..............................................................9
3.3 LED發(fā)光二極管 .................................................................10
3.3.1LED概述...................................................................... 10
3. 4總體設計及系統(tǒng)原理 ............................................................12
4   硬件設計 ......................................................................13
4. 1 單片機部分................................................................... 13
4.1.1 AT89S52單片機 ...............................................................13
4.1.2 單片機硬件資源分配 ..........................................................14
4.2 電源與復位和晶振電路部分.......................................................14
4.2.1 電源與復位電路部分 ..........................................................14
4.3 按鍵控制部分 ..................................................................16
4.4   圖案文字顯示電路部分 ........................................................17
5 軟 件 設計 .....................................................................18
5.1 編程軟件及匯編語言.............................................................18
5.2 主程序設計與程序分析...........................................................19
總   結(jié)........................................................................... 21
致謝............................................................................. 22
參 考 文獻 .......................................................................23
附錄 .............................................................................24

摘  要
根據(jù)單片機的特點及LED發(fā)光二極管亮滅在實際中運用的特點，本文提出一種用單片機控制LED亮滅的方法，從而顯示出用LED拼湊的桃心圖案和文字圖案。同時給出了軟硬件設計方法，設計過程包括硬件電路設計部分和程序設計部分。通過對元件的設計選擇，最終選用AT89S52型號的單片機，對單片機的引腳結(jié)構(gòu)功能進行了詳細的概述。本文用紅、黃、綠三色LED分別拼湊了三個圖案(桃心)、兩個漢字（汶川）、三個數(shù)字（512）。單片機的接口P2.0、P2.1、P2.2分別和三個桃心連接、P2.3、P2.4和兩個漢字連接、P2.5、P2.6、P2.7和三個數(shù)字連接，通過程序給單片機的P2的八個接口付與1或0的高低電平使單片機外部所連的LED點亮或熄滅，INT0外部中斷0為單片機P3.2口和一個外部外部按鍵信號接P3.3口，通過中斷程序改變圖案、文字、數(shù)字的循環(huán)點亮熄滅方式。

關(guān)鍵詞：單片機;  LED;  圖案文字數(shù)字顯示；軟硬件；外部中斷

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