Giúp đỡ về code C cho 8051

[namkoi312]

MÌNH MỚI COPY ĐƯỢC ĐOẠN CODE NÀY, DÙNG ĐỂ LẬP TRÌNH CHO LED MATRIX. NHƯNG MÌNH KHÔNG HIỂU LẮM, BẠN NÀO CÓ THỂ GIÚP MÌNH ĐƯỢC KHÔNG?
SẮP KT RỒI.
CẢM ƠN MỌI NGƯỜI NHIỀU NHÉ

 #include <REGX51.H>

sbit DATA  = P1^0;
sbit SH_CP = P1^1;
sbit ST_CP = P1^2;

unsigned char code hang[100]={
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,     
                       0xFC,0xFC,0xFC,0x00,0x00,0xFC,0xFC,0xFC,    // T
		       0xFF,0x00,0x00,0xE7,0xE7,0x00,0x00,0xFF,    //H
		       0xFF,0x03,0x01,0xCC,0xCC,0x01,0x03,0xFF,    //a
		       0xFF,0x00,0x00,0xF3,0xE7,0x00,0x00,0xFF,    //N  					      
			0xFF,0x00,0x00,0xE7,0xE7,0x00,0x00,0xFF,   //H
			0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
			0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
			0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,//tao khoang trong
			0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 };					   
unsigned int cot[8]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
unsigned int n,m,k;
void delay( unsigned int ms)
{
  unsigned int i,j;
 for(i=0;i<ms;i++);
 {
  for(j=0;j<125;j++)
  {;}
 }
}
//--------- Chuye^n no^'i tie^'p sang song song  
void convert (unsigned int x)
{
 unsigned int n,tg;
 for(n=0;n<8;n++)
 {
  tg=x;
  tg=tg&0x80;
  if(tg==0x80)
  DATA=1;
  else
  DATA=0;
  x=x<<1;
  SH_CP=0;
  SH_CP=1;
 }
}     
void main()
 {
  while(1)
    {
      for(m=0;m<72;m++)//do dai chu
        {
   	      for(k=0;k<5;k++)//toc do chay chu
	        {
	          for(n=m;n<=7+m;n++)
			 
	            {	  
                      convert(hang[n]);
	              if(n<8)convert(0xff);  else convert(hang[n-8]);	   
	              if(n<16)convert(0xff); else convert(hang[n-16]);
	              if(n<24)convert(0xff); else convert(hang[n-24]);
                      P2=cot[n-m];
					  
	              ST_CP=1;
	              ST_CP=0;
	              delay(100);
	            }
	         }
         }
     }
 }

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