xiapo.c

本人学习单片机一年多时间厚参加全国电子设计大赛的程序以及赛前练习的程序。

#include<reg51.h>

sbit P1_0=P1^0;
sbit P1_1=P1^1;
sbit P1_2=P1^2;
sbit P1_3=P1^3;

unsigned int i,j,k,l,m,x,yichu;
unsigned char th,tl;

void timer0(void) interrupt 1
{yichu++;
 if(yichu==15)
 {yichu=0;
  x++;
  if(P1_2==0)
   P1_2=1;
  else
   P1_2=0;
  if(x%2==1)
  {th=0xFC;    //1ms
   tl=0x18;
	}
  else
  {th=0xDC;    //9ms
   tl=0xD8;
   }
  }
 TH0=th;
 TL0=tl;
}

main()
{P1_0=0;
 P1_1=0;
 P1_2=0;
 P1_3=0;

 EA=1;
 ET0=1;
 TMOD=0x01;
 TH0=0xFC;    //5ms
 TL0=0x18;
 TR0=1;
 for(;;)
 ;
}