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.

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