交通灯控制实验，以74LS276 做为输出口，控制十二个发光二极管的亮灭，模拟交通灯控制；-Traffic lights control experiments to 74LS276 as an output control 12 to eliminate bright light-emitting diodes to simulate the traffic light control

了解缓冲器在接口电路中的作用，学习带有缓冲器的接口电路设计方法-Buffer in the interface circuit to understand the role of learning with a buffer of the interface circuit design method

了解锁存器在接口电路中的作用，学习带有锁存器的接口电路设计方法-Learn latch the role of the interface circuit to learn the interface with a latch circuit design method

利用74LS273实现数码管的静态显示，本文件包括在Proteus绘制的电路图，C51源程序及项目文件。-Using 74LS273 achieve digital control of static display, this document is included in the Proteus schematic drawing, C51 source and project files.