数显交通灯，本系统主程序模块主要完成的工作是对系统的初始化，发送显示数据，同时对键盘进行扫描，等待外部中断，以及根据所需要的功能进行相应的操作。-

The main module of the system is the work done on the system initialization, sending display data, while the keyboard scan, wait for external interrupts, and the appropriate action in accordance with the required functionality.