ORG 0000H
LJMP START
ORG 0040H
START: MOV R7,#04H ;
       MOV R6,#0FEH    ;
    MOV DPTR, #TAB ; LOOP:
     MOV A,R7
     MOVC A,@A+DPTR;
  MOV P2,#48H ;
  MOVX @R0,A;
  MOV A,R6;
  MOV P2,#88H;
  MOVX @R0,A;
  RL A;
  MOV R6,A;
  LCALL DELAY;
DELAY: MOV R5,#0AH;
       DJNZ R5,$
  DJNZ R7,LOOP;
  SJMP START
TAB:DB 00H,66H,4FH,5BH,06H;
  P0接的是2个74HC573，他们的LE分别接P2.7,P2.6；为什么不能把74hc573当作外部RAM而进行数据赋值呢？？？？？？