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利用取表的方法，使端口P1做單一燈的變化：左移2次，右移2次，閃爍2次（延時(shí)的時(shí)間0.2秒）。

要求：P1.0對(duì)應(yīng)著L1，P1.1對(duì)應(yīng)著L2，……，P1.7對(duì)應(yīng)著L8。

在用表格進(jìn)行程序設(shè)計(jì)的時(shí)候，要用以下的指令來(lái)完成
（1）． 利用MOV　DPTR，＃DATA16的指令來(lái)使數(shù)據(jù)指針寄存器指到表的開(kāi)頭。
（2）．  利用MOVC　A，＠A＋DPTR的指令，根據(jù)累加器的值再加上DPTR的值，就可以使程序計(jì)數(shù)器PC指到表格內(nèi)所要取出的數(shù)據(jù)。
因此，只要把控制碼建成一個(gè)表，而利用MOVC　工，＠A＋DPTR做取碼的操作，就可方便地處理一些復(fù)雜的控制動(dòng)作。
 
匯編源程序
                            ORG 0
START:               MOV DPTR,#TABLE
LOOP:                CLR A
                            MOVC A,@A+DPTR
                            CJNE A,#01H,LOOP1
                            JMP START
LOOP1:              MOV P1,A
                           MOV R3,#20
                            LCALL DELAY
                            INC DPTR
                           JMP LOOP
DELAY:              MOV R4,#20
D1:                     MOV R5,#248
                            DJNZ R5,$
                            DJNZ R4,D1
                           DJNZ R3,DELAY
                            RET
TABLE:              DB 0FEH,0FDH,0FBH,0F7H
                            DB 0EFH,0DFH,0BFH,07FH
                           DB 0FEH,0FDH,0FBH,0F7H
                            DB 0EFH,0DFH,0BFH,07FH               
                           DB 07FH,0BFH,0DFH,0EFH
                            DB 0F7H,0FBH,0FDH,0FEH
                            DB 07FH,0BFH,0DFH,0EFH
                            DB 0F7H,0FBH,0FDH,0FEH
                            DB 00H, 0FFH,00H, 0FFH
                            DB 01H
                            END
C語(yǔ)言源程序
#include
unsigned char code table[]={0xfe,0xfd,0xfb,0xf7,
                            0xef,0xdf,0xbf,0x7f,
                            0xfe,0xfd,0xfb,0xf7,
                            0xef,0xdf,0xbf,0x7f,
                            0x7f,0xbf,0xdf,0xef,
                            0xf7,0xfb,0xfd,0xfe,
                            0x7f,0xbf,0xdf,0xef,
                            0xf7,0xfb,0xfd,0xfe,
                            0x00,0xff,0x00,0xff,
                            0x01};
unsigned char i;
 
void delay(void)
{
  unsigned char m,n,s;
  for(m=20;m>0;m--)
  for(n=20;n>0;n--)
  for(s=248;s>0;s--);
}
 
void main(void)
{
  while(1)
    {
      if(table[i]!=0x01)
        {
          P1=table[i];
          i++;
          delay();
        }
        else
          {
            i=0;
          }
    }
}

參考鏈接：http://www.picavr.com/news/2008-01/2667.htm