【正文】 RET 。字符表TAB: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH END 重慶郵電大學本科畢業(yè)設計（論文）28結(jié) 論 本系統(tǒng)就是充分利用了 8051 和 8255 芯片的 I/O 引腳。系統(tǒng)統(tǒng)采用 MSC51系列單片機 at80c51 和可編程并行 I/O 接口芯片 8255A 為中心器件來設計交通燈控制器，實現(xiàn)了能根據(jù)實際車流量通過 8031 芯片的 P1 口設置紅、綠燈燃亮時間的功能；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(或人)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。系統(tǒng)不足之處不能控制車的左、右轉(zhuǎn)、以及自動根據(jù)車流改變紅綠燈時間等。這是由于本身地理位子以及車流量情況所定，如果有需要可以設計擴充原系統(tǒng)來實現(xiàn) 。 通過這次畢業(yè)設計，使我得到了一次用專業(yè)知識、專業(yè)技能分析和解決問題全面系統(tǒng)的鍛煉。使我在單片機的基本原理、單片機應用系統(tǒng)開發(fā)過程，以及在常用編程設計思路技巧（特別是匯編語言）的掌握方面都能向前邁了一大步，為日后成為合格的應用型人才打下良好的基礎。重慶郵電大學本科畢業(yè)設計（論文）29致 謝 在這次課程設計的完成過程中，我得到了許多人的幫助。 首先我要感謝我的老師在課程設計上給予我的指導、提供給我的支持和幫助，這是我能順利完成這次報告的主要原因，更重要的是老師幫我解決了許多技術上的難題，讓我能把系統(tǒng)做得更加完善。在此期間，我不僅學到了許多新的知識，而且也開闊了視野，提高了自己的設計能力。 其次，我要感謝幫助過我的同學，他也為我解決了不少我不太明白的設計上的難題。同時也感謝學院為我提供良好的做畢業(yè)設計的環(huán)境。 最后再一次感謝所有在設計中曾經(jīng)幫助過我的良師益友和同學。重慶郵電大學本科畢業(yè)設計（論文）30參考文獻 （1）呂能元，孫育才，楊峰. MCS51 單片微型計算機原理接口技術應用. 北（2） 年 12 月 （3） TTL . 北京 電子工業(yè)出版 年 5 月 （4）. 年 （5）李廣軍 實用接口技術 電子科技大學出版社 （6）網(wǎng)絡資源： 維普咨訊網(wǎng)；超星數(shù)字圖書 （7）張毅坤. 單片微型計算機原理及應用，西安電子科技大學出版社 1998 （8）余錫存 [M].陜西:西安電子科技大學出版社,2022. （9）雷麗文 [M].北京：電子工業(yè)出版社， （10）黃智偉，朱衛(wèi)華通用無線數(shù)據(jù)傳輸電路設計儀表技術 2022 年，第 5 期，45~46 （11）李冬梅用 89C51 單片機實現(xiàn) 5DLC 方式通訊江西煤炭科技 2022 年，第4 期，38~39 （12）王蘭勛，張鎖良單片機串行通信中糾突發(fā)錯誤的軟件實現(xiàn)河北大學學報(自然科學版)2022 年，第 21 卷，第 1 期，85~89 （13）馬寶甫一種混合糾錯算法及其單片機軟件實現(xiàn)山東礦業(yè)學院學報 1997 年，第 16 卷，第 3 期，270~274 （14）魄永安 cRC 一 16 編碼在單片機數(shù)據(jù)傳輸系統(tǒng)中的實現(xiàn)探測與控制學報2022 年 6 月，第 22 卷，第 2 期，60~64 （15）薛麗萍用單片機實現(xiàn)的磁卡讀卡機電子技術應用 1998 年第 5 期 68~70 鄭州大學碩士學位論文參考文獻 （16）王瑞紅，劉俊波采用單片機編程實現(xiàn)(15，7)BCH 碼的編譯碼煤礦自動化 1998 年，第 2 期，36~37 重慶郵電大學本科畢業(yè)設計（論文）31附 錄一、英文原文：Intelligent Transport Systems,and An Introduction to Intelligent Transport SystemsLike many other parts of business and government around the world, the construction and operation of transportation systems is being transformed by puters, sensors, and munications technology collectively called information technology (IT) . The application of IT to surface transportation is called Intelligent Transport Systems (ITS). ITS provides the ability to gather, anize, analyze, use, and share information about transportation systems. In the modem world, this ability is crucial to the effective and economical construction and operation of transportation systems and to their efficient use.ITS can be divided into nine subject fields。(1) Traveler Information: Services to support traveler decisionmaking before and during a trip: which travel mode to use, starting time, specific route, etc. .(2) Traffic Management。 Management of traffic flow on roads.(3) Demand Management。 Services to reduce traffic demand on roads and congestion in city centers by charging for road use and promoting use of other travel modes.(4) Road Management: Physical maintenance of roads and pavements, including repairs, snow clearance, etc. .(5) Advanced Driving Assistance: Automated systems to improve the performance of the vehicle and the driver to make driving safer.(6) Electronic Financial Transactions: Services to allow automatic electronic payment of tolls and fees, primarily on roads and bridges, but also to enter restricted city centers and sometimes to pay for parking charges, drivethrough meals, etc. .(7) Commercial Vehicle Management。 Services to support fleet and freight management, including fleet management and automatic safety and credential checking at borders.(8) Public Transport Management。 Services to improve the convenience and performance of public transport, such as schedule management and mon fare payment mechanisms.(9) Incident and Hazard Response。 Services to respond to accidents and other emergencies such as dispatch of ambulances, fire trucks, etc. .Through its use of information technology, ITS offers advantages that are not available in conventional transportation systems. Basically, ITS provides two kind of benefits. One kind is the resolution of traffic problems, including traffic congestion, air pollution, and traffic accidents. The other kind is improved services for users and increased efficiency of the transportation system and its operators.Resolution of Traffic Problems 重慶郵電大學本科畢業(yè)設計（論文）32MobilityITS includes many approaches to enhance the mobility of people and freight in all transportation modes. Traveler Information helps travelers avoid congestion and can help improve traffic conditions. Traffic Management, e. g. the more effective timing of traffic signals, can help increase traffic efficiency. Demand Management, e. g. road and access pricing can help relieve heavily congested urban areas. Commercial Vehicle Management helps to increase security and efficiency not only for carriers but also for related public agencies. There are many more examples as well.Traffic CongestionTraffic congestion is a serious problem in all parts of the world. ITS can help to mitigate congestion by helping people plan travel better, by suggesting alternate routes and travel times, by keeping travelers well informed, by leveling traffic loads on roadways, and by helping to respond to and clear incidents more rapidly.Environmental ImpactMaintaining air quality was once viewed as a luxury of developed countries, which could more easily bear the cost of technology to keep emissions under control. ITS helps reduce the environmental impact of road travel by optimizing trips, reducing congestion and crashes, improving vehicle and driver performance, and helping to manage the transportation system well.Reducing Fatalities and Crash SeverityTraffic accidents around the world continue to claim hundreds of thousands of lives each year and cause millions of injuries. The World Health Organization estimates that nearly 1. 2 million people worldwide died each year as a result of road traffic accidents. ITS is helping to shift the safety focus from