【正文】 .................................................................................................................... 14 第 4 章 系統(tǒng)硬件設(shè)計 ..................................................................................................................................................... 19 系統(tǒng)總框圖設(shè)計 ..................................................................................................................................................... 19 各個模塊電路設(shè)計 ................................................................................................................................................. 24 鍵盤設(shè)置電路 ................................................................................................................................................. 24 看門狗硬件電路 ............................................................................................................................................. 25 顯示電路 ......................................................................................................................................................... 25 交通燈的控制電路 ......................................................................................................................................... 25 第 5 章 系統(tǒng)的軟件設(shè)計 ................................................................................................................................................. 27 系統(tǒng)總程序設(shè)計 ..................................................................................................................................................... 27 每秒鐘的設(shè)定 ......................................................................................................................................................... 29 計數(shù)器初值計算 .............................................................................................................................................. 29 計算公式 ......................................................................................................................................................... 29 １秒的方法 ..................................................................................................................................................... 29 相應(yīng)程序代碼 ................................................................................................................................................. 29 軟件延時 ......................................................................................................................................................... 30 顯示程序設(shè)計 ......................................................................................................................................................... 30 顯示原理 ........................................................................................................................................................311 8255 輸出信號與數(shù)碼管的連接 .................................................................................................................... 31 8255 與 8051 的連接 ....................................................................................................................................... 31 第 6 章 結(jié)論 ...................................................................................................................................................................... 32 參考文獻 ............................................................................................................................................................................ 33 致 謝 ................................................................................................................................................................................. 34 附 錄 ................................................................................................................................................................................. 36 附錄 1：總圖 ................................................................................................................................................................. 35 附錄 2：程序源代碼 .................................................................................................................................................... 36 第 1章 緒論 當(dāng)今，紅綠燈安裝在各個道口上，已經(jīng)成為疏導(dǎo)交通車輛最常見和最有效的手段。 The traffic light circulation lightens, the countdown remains when for 5 seconds the yellow light twinkle police shows (traffic light signal through PA mouth output, demonstration time directly through 8255 PC mouth output to twoposition nixietube)。本系統(tǒng)采用 MSC51系列單片機 ATSC51和可編 程并行 I/O接口芯片 8255A為中心器件來設(shè)計交通燈控制器，實現(xiàn)了能根據(jù)實際車流量通過 8051 芯片的 P1 口設(shè)置紅、綠燈燃亮?xí)r間的功能 ；紅綠燈循環(huán)點亮，倒計時剩 5秒時黃燈閃爍警示（ 交通燈信號通過 PA口輸出 ， 顯示時間直接通過 8255 的 PC口 輸出 至雙位數(shù)碼管） ； 車輛闖紅燈報警；綠燈時間可檢測車流量并可通過雙位數(shù)碼管顯示。因此，單片機只需要和適當(dāng)?shù)能浖巴獠吭O(shè)備相結(jié)合，便可成為一個單片機控制系統(tǒng)。 本論文使用單片機的原因是看到單片機的發(fā)展趨 勢。在實時檢測和自動控制的單片機應(yīng)用系統(tǒng)中，單片機往往作為一個核心部件來使用，僅單片機方面知識是不夠的，還應(yīng)根據(jù)具體硬件結(jié)構(gòu)軟 硬 件結(jié)合，加以完善。 通常，單片機由單塊集成電路芯片構(gòu)成，內(nèi)部包含有計算機的基本功能部件：中央處理器、存儲器和 I/O 接口電路等。交通信號燈控制方式很多。 關(guān)鍵詞：單片機 交通燈 闖紅燈 檢測車流量 Abstract In recent years along with technical rapid development, monolithic integrated circuit application unceasingly thorough, simultaneously leads the traditional control examination technology to renew day by the realtime examination and in the automatic control monolithic integrated circuit application system, the monolithic integrated circuit often took a core part uses, the monolithic integrated circuit aspect knowledge is only insufficient, but also should act according to the concrete hardware architecture software and hardware union, consummates. The intersection vehicles shuttle, the pedestrian is bustling, car dealership traffic lane, human sidewalk, on is the streettraffic control lights