#include <iom16v.h>  
#pragma interrupt_handler ext_int2_isr:19 
 //指定外部中斷函數(shù)
#define uint unsigned int 
#define uchar unsigned char 


s_ms(uint ms)
{
for(;ms>1;ms--);
}

unsigned char i=1;
// External Interrupt 0 service routine
void ext_int2_isr(void)
{
  uchar aa=1;
  PORTD=~i++;
  while(aa)       //判斷端口是否恢復(fù)高電平，有延時(shí)抗干擾
  {
  aa=!(PINB&(1<<2));
  if(aa==0)
    {
	s_ms(15000);
	aa=!(PINB&(1<<2));
	}
  }
}


void main(void)
{
DDRD=0xff;
PORTD=0XFF;
DDRB=0xf0;
PORTB=0x0f;

SREG=0x80;    //開(kāi)全局中斷

GICR=0x20;   //開(kāi)外部中斷int_2,對(duì)應(yīng)按鍵K9,K0,KA,KB
while (1);
}