漢字LED顯示裝置的設(shè)計

電子機電論文編號:JD1038  論文字?jǐn)?shù):19632,頁數(shù):51

  目 錄
 第1章 緒論 1
1.1 選題背景 1
1.2 漢字LED顯示裝置的設(shè)計要求 1
 第2章 系統(tǒng)的總體設(shè)計 2
2.1 主要芯片的選擇 2
2.2 硬件電路總體設(shè)計思路 2
 第3章 系統(tǒng)硬件電路的設(shè)計與分析 4
3.1 單片機最小系統(tǒng) 4
 3.1.1 8051單片機簡介 4
 3.1.2 存儲器接口電路 6
 3.1.3 8255與單片機的接口電路 8
3.2 LED驅(qū)動電路 10
 3.2.1 行驅(qū)動電路 10
 3.2.2 列掃描電路 11
3.3 LED點陣顯示屏 12
 3.3.1 LED點陣的顯示原理 12
 3.3.2 LED點陣陣列的構(gòu)成 12
3.4 時鐘電路 13
 3.4.1 時鐘芯片DS12887 13
 3.4.2 DS12887與單片機的接口電路 17
3.5 鍵盤電路 18
3.6 串行通信接口電路 19
 第4章 系統(tǒng)的軟件設(shè)計 21
4.1 程序設(shè)計語言的簡介 21
4.2 主程序設(shè)計 21
4.3 鍵盤子程序設(shè)計 23
4.4 顯示子程序設(shè)計 24
4.5 部分程序代碼 27
 第5章 結(jié)論 31
 參考文獻 32
 致 謝 34
 附錄Ⅰ 外文及翻譯 35
 附錄Ⅱ 原理圖 45
 附錄Ⅲ 元件清單 47

摘 要
隨著信息技術(shù)的發(fā)展，LED顯示作為信息傳播的一種重要手段，已經(jīng)廣泛的應(yīng)用于大型商場、車站、碼頭、地鐵以及各類辦事窗口等公共場所，并取得了良好的效果。
 此裝置用以MCS-8051單片機為核心芯片的電路來實現(xiàn)，硬件電路主要由MCS-8051單片機、可編程并行I/O口器件8255、時鐘芯片DS12887、LED點陣驅(qū)動電路及外擴的存儲器M29F040、鍵盤和串行通信電路組成。此裝置能同時顯示8個漢字，每個漢字是16×16的發(fā)光二極管構(gòu)成的點陣，共采用32個8×8的LED模塊構(gòu)成發(fā)光點陣。LED點陣的驅(qū)動電路采用列掃描行驅(qū)動；在機內(nèi)設(shè)置了字庫，漢字可通過計算機寫入或通過按鍵輸入，并存于裝置內(nèi)。顯示方式為動態(tài)掃描多屏輪換顯示，根據(jù)漢字字?jǐn)?shù)多少自動識別靜止顯示或左移動態(tài)顯示，同時還具有時間顯示功能。
 
 關(guān)鍵詞： LED顯示；單片機；驅(qū)動電路；時鐘芯片DS12887 
 
  Abstract
 With the development of information technology, LED display as an important tool of information dissemination, has been widely used in major shopping malls, railway stations, docks, subway window and a variety of work and other public places, and have achieved good results.
 This device use MCS-8051 microcontroller as the core chip circuitry to realize, hardware circuits mainly by the MCS-8051 microcontroller, programmable parallel I/O port device 8255, the clock chip DS12887, LED dot-matrix drive circuit And the expansion of memory M29F040, keyboard and the serial communication circuit. This device can also showed that eight Chinese characters, each Chinese character is 16 × 16 LED dot matrix consisting of a total of thirty two by 8 × 8 LED modules of a luminous dots. The dot matrix LED drive circuit used to drive out scanning in the machines set up a character and write Chinese characters by computer or through the key input, both in the devices. Dynamic scanning for the display of multi-screen rotation, according to the number of Chinese characters Volume Automatic Identification static display or the left dynamic display, and also can display time.
 
  Key words: LED display; Single-chip-microprocessor; Driving circuit; Clock chip DS12887