51单片机控制的交通灯，通过定时器精确定时。此文件包中含有Proteus仿真图，PCB图，c程序并有注释，学习单片机的好资料。-51 single-chip microcomputer to control traffic lights, from time to time through the timer precision. This package contains Proteus simulation diagram, PCB map, c program and the Notes,