摘　要:近年來隨著科技的飛速發展，單片機的應用正在不斷深入，同時帶動傳統控制檢測技術日益更新。在實時檢測和自動控制的單片機應用系統中，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，還應根據具體硬件結構軟硬件結合，加以完善。十字路口車輛穿梭，行人熙攘，車行車道，人行人道，有條不紊。那么靠什么來實現這井然秩序呢？靠的就是交通信號燈的自動指揮系統。交通信號燈控制方式很多。本系統采用MSC-51系列單片機ATSC51和可編程并行I/O接口芯片8255A為中心器件來設計交通燈控制器，實現了能根據實際車流量通過8051芯片的P1口設置紅、綠燈燃亮時間的功能。 關鍵詞：單片機 交通燈 車流量 控制 Abstract:With the development of science and technology in recent years,the application of SCM is deepening in the same time promote more traditional control detection update.In real-time detection and control of the microcomputer application system,the microcontroller is often a core component to use,only SCM knowledge is not enough,also according to the specific combination of hardware,software and hardware structure ,to be improved.Crossroads shuttle vehicles,cars,buses and people walkways,orderly.What rely on to achieve the discipline of the order then? By automatic traffic lights is the chain of command control traffic lights.In this system,MSC-51 Series ATSC51 and programmable parallel I/O interface chip 8255A-centered design of traffic signal controller device to realize the actual traffic volume by 8051 according to the P1 port chip set of red,green time kindle function. Key words: microcontroller traffic light traffic flow control