基于MCS-51通用開發平臺設計

電子機電論文編號:JD283      論文字數:15942,頁數:42

  目  錄
1  引言 1
1.1  選題意義 1
1.2  單片機的發展和應用 1
1.3  單片機編程語言介紹 3
2  系統設計及工作原理 3
2.1  系統原理框圖及器件選擇 3
2.2  系統工作原理及整體電圖框圖 4
3  系統硬件設計 5
3.1  硬件模塊設計 5
3.1.1  數字量輸入輸出模塊設計 5
3.1.2  顯示接口電路的設計 6
3.1.3  鍵盤接口電路的設計 10
3.1.4  定時模塊設計 14
3.1.5  數據存儲器單元的設計 15
3.1.6  數模轉換單元設計 17
3.2  相關芯片介紹 18
3.2.1  AT89C52芯片的介紹 18
3.2.2  并行接口芯片8255A 19
3.2.3  8254可編程計數／定時芯片簡介： 20
3.2.4  D/A轉換器 22
4  系統軟件設計 24
4.1  系統工作主程序流程圖 24
4.2  系統軟件流程 25
4.2.1  液晶驅動程序流程 25
4.2.2  鍵盤掃描程序流程 27
5  結論 29
附錄1 30
附錄2 34
附錄3 36
附錄4 37
參考文獻 38
致謝 39

摘  要
本文首先在緒論介紹了此系統的研究意義和使用的開發環境，以及使用MCS-51系列的單片機芯片。在第二章論述了總體設計過程及器件的選擇，第三章著重描述了系統硬件電路設計、硬件設計框圖及所使用的各種芯片功能與特性,在第四章中重點剖析了軟件設計的過程。
本系統是在以51單片機為基礎上擴展，使其能更方便地運用于測試系統中。本設計主要在51單片機上擴展I/O口，擴展定時器定時范圍，擴展鍵盤顯示接口并寫好底層程序。

關鍵詞：單片機技術，8255A, 液晶顯示

Abstract
With the infiltration in the social field of the computer in recent years, the application of the one-chip computer is moving towards deepening constantly, drive tradition is it measure crescent benefit to upgrade day to control at the same time. In measuring in real time and automatically controlled one-chip computer application system, the one-chip computer often uses as a key part, only one-chip computer respect knowledge is not enough, should also follow the structure of the concrete hardware , and direct against and use the software of target's characteristic to combine concretely, in order to do perfectly.
 This system one chip computer is in expands at the base of MCS-51 one chip computer. Make it used more convenient in the test system. This design mainly expands I/O in the take 51 on chip computer, expands the timer fixed time scope, expands the keyboard to demonstrate the connection and writes the first floor procedure.
This text has introduced the research meaning of this system and development environment used in the introduction at first, developing the one-chip computer chip of MCS-51 series used. Have described the overall design process in chapter two, have confirmed chapter three of choice of device has described emphatically that designs the block diagram and various kinds of chip functions and characteristics used in circuit design of the systematic hardware, hardware, have analyzed the design course of the software especially in chapter four.

Keywords：Technology of the one-chip computer, 8255A, Liquid crystal display