交通灯程序设计源代码

#include<reg51.h>      sbit P1_0=P1^0;sbit S1=P3^0;      bit flag;  void  mDelay(unsigned int x)    {  unsigned int i,j;  for (i=x;i>0;i--)  for (j=0;j<114;j++);}void timer0() interrupt 1{  P1_0=!P1_0;   TH0=(65536-461)/256;   TL0=(65536-461)%256;}void main(void) {  TMOD = 0x01;      P1_0=0;  TH0=(65536-461)/256;   TL0=(65536-461)%256;      EA=1;   ET0=1;   TR0=0;  flag=0;               while(1)
 {
   if(S1==0)           {    mDelay(10);       if(S1==0)       
    {      flag=~flag;      while(S1==0);      TR0=flag;     }    } 
   } }