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#includereg51.h>

#defineucharunsignedchar

#defineuintunsignedint

sbitRED_A=P0^0;//东西向指示灯

sbitYELLOW_A=P0^1;

sbitGREEN_A=P0^2;

sbitRED_B=P0^3;//南北向指示灯

sbitYELLOW_B=P0^4;

sbitGREEN_B=P0^5;

//延时倍数，闪烁次数，操作类型

变量

ucharTime_Count=0,Flash_Count=0,Operation_Type=1;

//定时器0中断函数

voidT0_INT()interrupt1

{

TL0=-50000/256;

TH0=-50000%256;

switch(Operation_Type)

{

case1: //东西向绿灯与南北向红灯亮5s

RED_A=0;YELLOW_A=0;GREEN_A=1;

RED_B=1;YELLOW_B=0;GREEN_B=0;

if(++Time_Count!=100)return;//5s（100*50ms）切换

Time_Count=0;

Operation_Type=2;

break;

case2: //东西向黄灯开始闪烁，绿灯关闭

if(++Time_Count!=8)return;

Time_Count=0;

YELLOW_A=~YELLOW_A;GREEN_A=0;

if(++Flash_Count!=10)return; //闪烁

Flash_Count=0;

Operation_Type=3;

break;

case3: //东西向红灯与南北向绿灯亮5s

RED_A=1;YELLOW_A=0;GREEN_A=0;

RED_B=0;YELLOW_B=0;GREEN_B=1;

if(++Time_Count!=100)return;//5s（100*50ms）切换

Time_Count=0;

Operation_Type=4;