请高手帮我用8051单片机用汇编一个数字的显示 开关按一下 数字增加一 从0到9 汇编程序

请高手帮我用8051单片机用汇编一个数字的显示 开关按一下 数字增加一 从0到9 汇编程序

SP1 EQU P3.2

ORG 0000H
MOV 30H, #3FH ;0
MOV 31H, #06H ;1
MOV 32H, #5BH ;2
MOV 33H, #4FH ;3
MOV 34H, #66H ;4
MOV 35H, #6DH ;5
MOV 36H, #7DH ;6
MOV 37H, #07H ;7
MOV 38H, #7FH ;8
MOV 39H, #6FH ;9
M_0: MOV R0, #30H
DISP: MOV P2, @R0
WT: JB SP1, $
MOV R6, #40
DJNZ R7, $
DJNZ R6, $ - 2
JB SP1, WT
JNB SP1, $
INC R0
CJNE R0, #3AH, DISP
SJMP M_0
END

TIM EQU 30H
CNTA EQU 31H
CNTB EQU 32H
ORG 00H
LJMP START
ORG 0BH
LJMP T0X
ORG 30H
START: MOV TIM,#00H
MOV CNTA,#00H
MOV CNTB,#00H
MOV TMOD,#01H
MOV TH0,#(65536-4000)/256
MOV TL0,#(65536-4000) MOD 256
SETB TR0
SETB ET0
SETB EA
SJMP $
T0X:
MOV TH0,#(65536-4000)/256
MOV TL0,#(65536-4000) MOD 256
MOV DPTR,#TAB
MOV A,CNTA
MOVC A,@A+DPTR
MOV P3,A
MOV DPTR,#DIGIT
MOV A,CNTB
MOV B,#8
MUL AB
ADD A,CNTA
MOVC A,@A+DPTR
MOV P1,A
INC CNTA
MOV A,CNTA
CJNE A,#8,NEXT
MOV CNTA,#00H
NEXT: INC TIM
MOV A,TIM
CJNE A,#250,NEX
MOV TIM,#00H
INC CNTB
MOV A,CNTB
CJNE A,#10,NEX
MOV CNTB,#00H
NEX: RETI
TAB: DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FH
DIGIT: DB 00H,00H,3EH,41H,41H,41H,3EH,00H
DB 00H,00H,00H,00H,21H,7FH,01H,00H
DB 00H,00H,27H,45H,45H,45H,39H,00H
DB 00H,00H,22H,49H,49H,49H,36H,00H
DB 00H,00H,0CH,14H,24H,7FH,04H,00H
DB 00H,00H,72H,51H,51H,51H,4EH,00H
DB 00H,00H,3EH,49H,49H,49H,26H,00H
DB 00H,00H,40H,40H,40H,4FH,70H,00H
DB 00H,00H,36H,49H,49H,49H,36H,00H
DB 00H,00H,32H,49H,49H,49H,3EH,00H
END

硬件设置：
1、P0口接共阳极数码管，P0口与数码管串接300~470欧电阻；
2、P1.0接按键，低电平有效；
3、晶振为12M
软件部分如下：
ORG 00H
LJMP MAIN
ORG 100H
MAIN:
MOV 30H,#00H
MOV DPTR,#TAB
START:
LCALL SHOW_DATA
JB P1.0,START
LCALL DELAY_50MS
JNB P1.0,$
MOV A,30H
MOV B,#09H
DIV AB
JZ ADD_1:
MOV 30H,#00H
SJMP START
ADD_1:
INC 30H
SJMP START
DELAY_50MS:
MOV R7,#200D
LP:
MOV R6,#250D
DJNZ R6,$
DJNZ R7,LP
RET
SHOW_DATA:
MOV A,30H
MOVC A,@A+DPTR
MOV P0,A
RET
TAB: ;表：共阳数码管 0-9 A-F
DB 0C0H,0F9H,0A4H,0b0H,99H,92H,82H,0F8H,80H,90H,88H,83H,0C6H,0A1H,86H,8EH
END