INT0 스위치를 누르면 인터럽트 발생하면서 LED한칸씩 이동

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#include<iom128.h>
#include<ina90.h>

unsigned int data=0xFE;

void main(void)
{
  DDRB=0xFF;
  PORTB=0xFF;

  DDRD_Bit0=0;

  EIMSK |= 0x01;
  EICRA |= 0x03;
  EIFR |= 0x01;

  __enable_interrupt();

  while(1);
}

#pragma vector=INT0_vect
__interrupt void INT0_interrupt(void)
{
  __disable_interrupt();

  PORTB=data;

  data--;

  __enable_interrupt();
}