a1.c

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//a1.c
//unsigned char TH1=0xc0,TL1=0xb0,hi=0x3c,lo=0xb0;//50ms
unsigned char TH1=0xf8,TL1=0xf0,hi=0xd8,lo=0xf0;//10ms
unsigned int tf0=9900;
//unsigned long time1 _at_ 0x30;
//
  unsigned long time1 _at_ 0x30,time _at_ 0x40,t _at_ 0x50;
main()
{while(1){
 //time1=(long)((TH1*256+TL1)-(hi*256+lo));
 //time1=(long)((TH1*256+TL1)-(hi*256+lo))*50;
 //time1=(long)((TH1*256+TL1)-(hi*256+lo))*(long)50
 //time1=(long)((TH1*256+TL1)-(hi*256+lo))*(long)50/(long)(0x10000-(hi*256+lo));
   //time1=((TH1*256+TL1)-(hi*256+lo))*(long)50/(0x10000-(hi*256+lo));

   // time=10*tf0;
   time=(long)10*tf0;   //time=(10*tf0)ms
   time1=((TH1*256+TL1)-(hi*256+lo))*(long)10/(0x10000-(hi*256+lo));//time1<10ms
   if(time1>4) t=time/10+1;//t的单位是ms
       else t=time/10; 
  }}