麻烦帮忙看下这程序怎么有问题额 ，谢谢回复

ORG 0000H
LJMP MAIN
ORG 0060H
MAIN:MOV A,#00H
MOV 40H,A ; 初始化 个位
MOV 41H,A ; 十位
MOV 42H,A
MOV R0,#00H
MOV DPTR,#TABLE
MOV P2,#0FFH
MOV P1,#00H
MOV P3,#0FFH
DISPLAY:LCALL KEY
MOV A,41H
MOVC A,@A+DPTR
MOV P0,A
CLR P2.3
; LCALL DELAY
SETB P2.3 ;显示十位

MOV A,40H
MOVC A,@A+DPTR
MOV P0,A
CLR P2.2
; LCALL DELAY ;显示个位
SETB P2.2

MOV P0,#0A1H
CLR P2.1
; LCALL DELAY ;显示d
SETB P2.1


MOV P0,#83H
CLR P2.0 ;显示b
; LCALL DELAY
SETB P2.0

JMP DISPLAY
KEY:MOV A,P3
MOV 21H,A
XRL A,#0FFH
JZ RETURN
LCALL DL10MS
MOV A,P3
CJNE A,21H,RETURN
JNB P3.2,I0
JNB P3.3,I1
I0:MOV A,42H
SWAP A
CJNE A,#06H,DAA
RET
DAA:INC A
MOV P1,A
SWAP A
MOV 42H,A
MOV A,42H
ANL A,#0FH
MOV 40H,A
MOV A,42H
ANL A,#0F0H
SWAP A
MOV 41H,A
SJMP RETURN
I1:MOV A,42H ;加 中断0
SWAP A
CJNE A,#00H,DECC
RET
DECC:DEC A
MOV P1,A
SWAP A
MOV 42H,A
MOV A,42H
ANL A,#0FH
MOV 40H,A
MOV A,42H
ANL A,#0F0H
SWAP A
MOV 41H,A
RETURN:RET
DL10MS:
MOV R6,#0D0H
DL1: MOV R7,#19H
DL2: DJNZ R7,DL2
DJNZ R6,DL1
RET

TABLE:DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H
;TABLE:DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH
END

http://www.eehome.cn/file:///C:/Users/Administrator.9WQX6G9ZVUMX3T8/AppData/Roaming/Tencent/Users/450124957/QQ/WinTemp/RichOle/69G86G_7N6I5U%E)BOFR)27.jpg
就是一个简单的通过单片机按键控制运放增益的电路，从0DB步进到60DB，数码管显示增益数值。
可是按加的按键就直接就成了60DB，是不是抖动的问题呢，麻烦回复一下，谢谢