1打开proteus仿真软件，绘制交通灯仿真电路图，如下：
2打开Keil4编程软件，根据刚刚绘制的交通灯仿真电路图编写相应的程序，程序如下：
3#include #define uchar unsigned char#define uint unsigned intsbit RED_A=P0^0;sbit YELLOW_A=P0^1;sbit GREEN_A=P0^2;sbit RED_B=P0^3;sbit YELLOW_B=P0^4;sbit GREEN_B=P0^5;uchar Flash_Count = 0;Operation_Type = 1;void DelayMS(uint x){ uchar t; while(x--) { for(t=120;t>0;t--); }}void Traffic_lignt(){ switch(Operation_Type) { case 1: RED_A=1;YELLOW_A=1;GREEN_A=0; RED_B=0;YELLOW_B=1;GREEN_B=1; DelayMS(2000); Operation_Type = 2; break; case 2: DelayMS(200); YELLOW_A=~YELLOW_A; if(++Flash_Count !=10) return; Flash_Count=0; Operation_Type = 3; break; case 3: RED_A=0;YELLOW_A=1;GREEN_A=1; RED_B=1;YELLOW_B=1;GREEN_B=0; DelayMS(2000); Operation_Type = 4; break; case 4: DelayMS(200); YELLOW_B=~YELLOW_B; if(++Flash_Count !=10) return; Flash_Count=0; Operation_Type = 1; break; }}void main(){ while(1) { Traffic_lignt(); }}
4将Keil4编写好的程序导入proteus仿真软件中，效果如下：
