/***************************************************************************
                                          中斷系統的應用（一）
*****************************************************************************/
#include"reg51.h"
#define uint unsigned int
#define uchar unsigned char
const tab[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f,     //正向流水燈
             0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe,0xff,     //反向流水燈
             0xaa,0x55,0xaa,0x55,0xaa,0x55,0xff, };        //隔燈閃爍
const tab2[]={0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,};
//uchar a;
void delay()
{
	uint i,j;
	for(i=0;i<256;i++)
		for(j=0;j<256;j++)
				{;}
}

/**********************************中斷程序*******************************************************/
void  int1() interrupt 0 
{  
  uchar i;
     for(i=0;i<10;i++)
        {	P0=tab2[i];
				delay();}	
}
/*************************************************************************************************/

void main(void)
{
	EX0=1;         //打開外部中斷0
	IT0=1;         //下降沿觸發中斷INT0
	EA=1;          //全局中斷允許   	
     while(1)            
         { uchar x;    
	               for(x=0;x<23;x++)
		              {   P0=tab[x];
					      delay();}
         }  
 }