ATMEGA8 Counter

#include
#include
#define uchar unsigned char
#define uint unsigned int
/***********The corresponding digital tubes display********************/
const uchar table[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned long load=0;
uchar data[4]={0,0,0,0};//
uint cnt=0;//Number of interrupts in timing
uchar temp=0;//This number is required when it exceeds 65536
//
void display(uchar *p)
{
 uchar i,j,sel=0x01;
 for(j=0;j<2;j++)
  for(i=0;i<4;i++)
  {PORTB=~table[p[i]];
   PORTC=sel;
   Delay_us(2000);
   sel=sel<<1;
   }
}
void process(unsigned long t,uchar *p)//Data processing
{unsigned long i=t; 
 if(i<=9999)
  PORTD=PORTD|0X03;
  else if((i<=99999)&&(i>9999))
  { 
  i=i/100;
  PORTD=PORTD&0 XFE;
  PORTD=PORTD|0X02;
  }
  else if(i>99999)
 {
  PORTD=PORTD|0X01;
  PORTD=PORTD&0XFD;
  i=i/1000;
  }
  p[3]=i/1000;
 i=i%1000;
 p[2]=i/100;
 i=i%100;
 p[1]=i/10;
 i=i%10;
 p[0]=i;
 }
void int_io(void)
{DDRB=DDRC=0XFF;
 DDRD=0XDF;
 PORTC=PORTB=0XFF;
 PORTD=0XFF;
 SREG=0X80;//Global enable
 TCCR1B=0X06;//Counting mode: T1 falling edge
 TCNT1H=0X00;//Initial value of counter
 TCNT1L=0X00;
  }
void main(void )
{
 int_io();
 PORTB=0X00;
 PORTC=0XFF;
 Delay_ms(500);
 PORTB=0XFF;
 /****************************/
 TCNT0=0X06;//The initial value of timing count is 6
 TCCR0=0X04;//T/C0 works in timing mode, system clock is divided by 256
 TIMSK=0X01;//Timing local enable T/C0
 while(1)
 {
  process(load,da ta);
  display(da ta);
  if(TIFR&0X04)//Use the flag bit to handle events when >65536
   { // if(TIFR&0X20)
       temp++;
    TIFR=TIFR&0X04;
 }
  }
 }
 /************************/
 ////////////////The following is the timer interrupt of T0
#pragma interrupt_handler time0:10
void time0(void)
{ 
  uint tep=0;//Read the value of high word TCNT1L
   cnt++;
  if(125==cnt)//125*256us, and this is used to adjust the accuracy;
    {
  cnt=0;//
  /********The following is the value of reading the counter***********/
  load=0;
  load=TCNT1L; //Read the low bit value of the counter
  tep=TCNT1H*256; //Read the high bit value of the counter and process it
  load=tep+load; //High bit plus low bit
  load=load+65536*temp; //Processed data
  /***********************/
  TCNT1H=0X00;//Reassign initial value
     TCNT1L=0X00;
  temp=0;
 }
}
//TO is used for timing,