模拟交通灯控制
P0口段码
P1口位吗
用数码管动态显示剩余时间；
P2口显示红绿黄灯；
东西方向灯分别用P00东西绿，P01东西黄，P02东西红；

   P05南北绿，P06南北黄，P07南北红。
 

*/

#include
#define uint unsigned int 
#define uchar unsigned char
uchar code dula[]={0x3f,0x06,0x5b,0x4f,0x66,
     0x6d,0x7d,0x07,0x7f,0x6f};
uchar code wula[]={0xfe,0xfd};
sbit ds_green=P2^0;
sbit ds_yellou=P2^1;
sbit ds_red=P2^2;
sbit nb_green=P2^5;
sbit nb_yellou=P2^6;
sbit nb_red=P2^7;
uchar flag1s,num1,num2,green,yellou,temp;
bit flag500ms,flag1;
void delay(uint z);
void disp();
void main()
{
green=30;
yellou=5;

TMOD=0x01;
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
ET0=1;
EA=1;
TR0=1;

while(1)
disp();

}
//--------------------
void delay(uint z)
{
 uint x,y;
   for(x=0;x  for(y=0;y<112;y++);
}
//----------------------
void timer0() interrupt 1
{
TH0=(65536-10000)/256;
TL0=(65536-10000)%256;
num1++;
 if(num1==50)
 {num1=0;
 num2++;
 flag500ms=~flag500ms;
 if(num2==2)
  {num2=0;
  flag1s++;flag1=1;
         if(flag1s>70)
          flag1s=0;
  }
 }
  if(flag1s<=30)
     {ds_green=0;ds_red=1;ds_yellou=1;
  nb_red=0;nb_yellou=1;nb_green=1;
  }
    if((flag1s>30)&&(flag1s<=35))
     { ds_green=1;ds_red=1;
  nb_red=0;nb_yellou=1;
  nb_green=1;
  ds_yellou=flag500ms;
  }
    if((flag1s>35)&&(flag1s<=65))
     {ds_green=1;ds_red=0;ds_yellou=1;
  nb_red=1;nb_yellou=1;nb_green=0;}
 if((flag1s>65)&&(flag1s<=70))
     {ds_green=1;ds_red=0;ds_yellou=1;
  nb_red=1;nb_green=1;
  nb_yellou=flag500ms;
      }
  
    
}
//---------------------------
void disp()
{   uchar i;
 if((flag1s<=30)||((flag1s>35)&&(flag1s<=65)))
     {yellou=5;
       if(flag1==1)
        {flag1=0;green--;}
        P0=dula[green/10];
   P1=wula[0];
        delay(5);
  P0=dula[green%10];
   P1=wula[1];
        delay(5);
      }
 if(((flag1s>30)&&(flag1s<=35))||((flag1s>65)&&(flag1s<=70)))
  {green=30;
       if(flag1==1)
        {flag1=0;yellou--;}
      P0=dula[yellou/10];
   P1=wula[0];
        delay(5);
  P0=dula[yellou%10];
   P1=wula[1];
        delay(5);
      }

}