#include <AT89X52.H> 
  
unsigned char code taba[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; 
unsigned char code tabb[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80}; 
  

void delay1(void) 
{ 
  unsigned char i,j,k; 
  
  for(k=10;k>0;k--) 
  for(i=20;i>0;i--) 
  for(j=248;j>0;j--); 
  
} 
  
void main(void) 
{ 
  unsigned char i,j; 
  
  while(1) 
    { 
      for(j=0;j<3;j++)
        { 
          for(i=0;i<8;i++) 
            { 
              P3=taba[i]; 
              P1=0xff; 
              delay1(); 
            } 
        } 
  
      for(j=0;j<3;j++)
        { 
          for(i=0;i<8;i++) 
            { 
              P3=taba[7-i]; 
              P1=0xff; 
              delay1(); 
            } 
        } 
  
      for(j=0;j<3;j++)
        { 
          for(i=0;i<8;i++) 
            { 
              P3=0x00; 
              P1=tabb[7-i]; 
              delay1(); 
            } 
        } 
  
       for(j=0;j<3;j++)
        { 
          for(i=0;i<8;i++) 
            { 
              P3=0x00; 
              P1=tabb[i]; 
              delay1(); 
            } 
        } 
  
    } 
}