【正文】 片機的應(yīng)用..................................................................................................9 單片機的基本系統(tǒng)結(jié)構(gòu)..................................................................................10第3章 硬件設(shè)計...........................................................................................................11 硬件部分總體框架..........................................................................................113. 2 單片機Mega8簡介.........................................................................................11 3. 2. 1 AVR Mega8的主要性能參數(shù)..........................................................11 Mega8引腳說明...............................................................................12 3. 2. 3 Mega8最小系統(tǒng)電路計...................................................................14 其它芯片簡介..................................................................................................15 3. 3. 1 74HC595簡介....................................................................................15 3. 3. 2 74HC154簡介....................................................................................163. 4 漢字字模提取................................................................................................16 3. 4. 1 16*16點陣漢字的字模提取............................................................16 3. 4. 2 16*8點陣的數(shù)字字模提取..............................................................17 3. 5 16*64LED點陣的結(jié)構(gòu)及顯示原理...............................................................18 3. 6 16*64 LED點陣驅(qū)動原理..............................................................................19第4章 軟件設(shè)計............................................................................................................20 　編程語言選擇................................................................................................20 4. 2 程序設(shè)計與流程圖........................................................................................20 主程序.................................................................................................20 中斷處理程序.....................................................................................21 按鍵讀取程序.....................................................................................23 按鍵處理程序.....................................................................................26 4. 2. 5 正常/調(diào)分/調(diào)時顯示程序..................................................................28 4. 2. 6 調(diào)速顯示、左移顯示程序................................................................30 4. 2. 7 時間處理程序....................................................................................35第5章 調(diào)試過程及相關(guān)問題的處理............................................................................37 開發(fā)工具.........................................................................................................37 IAR集成開發(fā)環(huán)境 ...........................................................................37 AVR_fighter編程下載軟件和下載器的制作.................................41 Protenus單片機仿真軟件................................................................42 調(diào)試步驟.........................................................................................................44 Proteus硬件電路圖繪制..................................................................44 IAR avr程序設(shè)計流程......................................................................45 觀察仿真結(jié)果.....................................................................................45第6章 PCB設(shè)計.............................................................................................................49 6. 1 Protel99 設(shè)計PCB的一般流程.................................................................49 6. 2 PCB相關(guān)設(shè)計圖..........................................................................................49 6. 2. 1 PCB原理圖......................................................................................50 6. 2. 2 PCB圖..............................................................................................51 6. 2. 3 PCB 3D圖........................................................................................52 小結(jié)...................................................................................................................................53致謝...................................................................................................................................54參考文獻............................................................................................................................55III 西南科技大學(xué)本科生畢業(yè)論文 引 言 LED點陣顯示屏作為信息傳播的一種重要手段，具有亮度高、工作電壓低、功耗小、小型化、壽命長、耐沖擊和性能穩(wěn)定等優(yōu)點。 Mega8。關(guān)鍵詞: 電子時鐘；點陣顯示原理； LED點陣；單片機； Mega8；IAR；74HC154；74HC595； Design and Implementation of Dotmatrix ClockDisplay ScreenAbstract: Electronic clock system, which features that time is very accurate and function are diversity, brought us great ,The LED dot matrix have advantage of high brightness, low power consumption, long lifetime etc. If use LED dot matrix as screen to display electronic clock, can achieve longrange, large angle of the clock display very suitable to display the time in public places. This design focuses on the display of dot matrix .Look from the macro, the design can be divided into two parts: the screen part and microcontroller part. The microcontroller control the Leds off and on. In this design, using 16 x 64 monochrome LED as the display screen, using Mega8 as microcontroller,We can get an effect of static display and leftmove full consideration to the ease Expansion of hardware and software , the framework of ideas can be easily expanded to dispaly a large number of Chinese characters or expanded to more dotmatrix Led screen The knowledge involved in this design are: dot matrix display principle, font data extraction, leftmove showe algorithm, Meg8 and the use of IAR t