#include <reg51.h>
#define  uchar unsigned char
uchar sn=10;
uchar idata nowrate[2]={0x00,0x00};
uchar idata *pp;
bit pf=1;

void contrl(direct,mode)
bit direct;
uchar mode;
{ uchar i;
  uchar idata  *cmode;
  uchar idata rise[20];
  uchar idata fall[20];
  uchar idata plus[7]={0x01,0x03,0x02,0x06,0x04,0x05,0x00};
  uchar idata minu[7]={0x05,0x04,0x06,0x02,0x03,0x01,0x00};

   if(direct)  cmode=plus;
     else  cmode=minu;
   switch(mode)
   { case 1:pp=rise;break;
     case 2:pp=nowrate;break;
     case 3:pp=fall;break;
     default:pp=nowrate;break;
   }
   do{
     P1=cmode[i];
     if(cmode[++i]==0x00) i=0;
     while(pf);
     pf=1;
     if((mode==1)||(mode==3))  pp+=2;
   } while(sn--);
}

void intt0(void) interrupt 1
{
   TL0=*pp;nowrate[0]=TL0;
   TH0=*(pp+1);nowrate[1]=TH0;
   pf=0;
}

void main(void)
{
  TMOD=0x01;
  TH0=0x00;
  TL0=0x00;
  TR0=1;
  ET0=1;
  EA=1;
  contrl(1,1);
  sn=10;
  contrl(1,2);
  sn=10;
  contrl(1,3);
 }