"STC89C52单片机实现的交通信号灯控制系统设计与实现"

h is based on a single-chip microcontroller. The system simulates the passage instructions at intersections in reality, including countdown, and emergency vehicles forcefully passing through functions. Using the STC89C52 chip as the central device to design the traffic light control circuit, combined with the module displaying time on the seven-segment common cathode LED, the traffic light display module, crystal oscillator circuit, reset circuit, and button circuit modules. Through software simulation and hardware debugging, the system achieves the lighting time of red, yellow, and green lights, dual-digit LED countdown display, alternating lighting of three colored lights, and interrupt processing functions in emergency situations. This system has high performance-price ratio, strong practicality, easy operation, comprehensive functions, and broad application prospects. Key words: traffic lights; STC89C52 microcontroller; emergency passage; interrupt processing.