LED digital display electronic clock

//***********************************
// LED digital display electronic clock
//***************************************

//***********************************

//Programming ideas:
//Use timer interrupt type digital tube dynamic scanning.
//Because the timekeeping part requires more precision, the timer automatic loading type is adopted, and timer 2 is used as the second generator, because timer 2 can be set to 16 bits for automatic loading,
#include
#include
#define uchar unsigned char
sure_time (void);
bit dis;
uchar code LED_DATA[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //0~9 digital data
uchar data DATA_TEMP[8]; //Display buffer area, display 00-00-00 when booting
uchar data digit; //Shift variable (for dynamic scanning)
static uchar data t,k,i;
static uchar data sec=0,min=55,hour=22;
main ()
{    

 TMOD=0X01; //Timer 0
 ET0=1; //Open timer 0 interrupt
 EA=1; //Open general interrupt
 TH0=0XFC; //Timer 0 timing 1ms
 TL0=0X18;
 TR0=1; //Start timer
 RCAP2H=0X3C; //Timer 2 timing 50ms
 RCAP2L=0XB0;
 ET2=1;
 TR2=1;
 digit=0xfe;
 P3=0XFF; //Close display
 sure_time ();
 DATA_TEMP[2]=0XBF;
 DATA_TEMP[5]=0XBF;
 while (1)
  {
 

  }
}

void displayscanf (void) interrupt 1 //dynamic display scanning function
{   
 
  TH0=0XFC;
  TL0=0X18;
     P0=DATA_TEMP[i];
  i++;
  P3=digit;
  digit=_crol_(digit,1);
  if (i>7)
    {
      i=0;
   digit=0xfe;
    }
}

void timer_server (void) interrupt 5 //Clock timing
{

  TF2=0;
  t++;
  if (t==20)
   {
     t=0;
  sec++;
 
  if (sec>59)
    {
      sec=0;
   min++;
  
   if (min>59)
   {
   min=0;
   hour++;
  
     if (hour>23) hour=0;
     
   DATA_TEMP[1]=LED_DATA[hour%10];  
    DATA_TEMP[0]=LED_DATA[hour/10];
   }

  DATA_TEMP[4]=LED_DATA[min%10];
   DATA_TEMP[3]=LED_DATA[min/10];
    }

 DATA_TEMP[7]=LED_DATA[sec%10];
  DATA_TEMP[6]=LED_DATA[sec/10];
   }
   
}

sure_time (void) //Initialize the time and update the data in the DATA_TEMP array
{
 DATA_TEMP[1]=LED_DATA[hour%10];  
 DATA_TEMP[0]=LED_DATA[hour/10];
 DATA_TEMP[4]=LED_DATA[min%10];
    DATA_TEMP[3]=LED_DATA[min/10];
   DATA_TEMP[7]=LED_DATA[sec%10];
   DATA_TEMP[6]=LED_DATA[sec/10];
}