这是程序，实验验证是对的，请问怎么调软件设置
ORG 0000H
LJMP MAIN
ORG 0030H
MAIN:MOV R5,#0F7H
MOV R4,#4
MOV R3,#00H
MOV DPTR,#TAB
DIR: MOV A,R3
MOVC A,@A+DPTR
MOV P0,A
MOV P2,R5
MOV A,R5
RR A
MOV R5,A
LCALL DLY
INC R3
DJNZ R4,DIR
LJMP MAIN
TAB: DB 77H,41H,3BH,6BH,4DH,6EH,7EH,43H,7FH,6FH
DLY: MOV 33H,#20
DLY2:MOV 32H,#20
DLY1:MOV 31H,#250
DJNZ 31H,$
DJNZ 32H,DLY1
DJNZ 33H,DLY2
RET
SJMP $
END

数码管无法正常显示

没有延时或者消隐