8051单片机，七段led显示实验共阴级，编程使显示89，汇编语言

DAT EQU 30H
SCANLED EQU 32H
ORG 0000H
LJMP MAIN
ORG 000BH
LJMP T0ISR
ORG 0030H
MAIN:
MOV SP,#5FH
MOV TMOD,#01H
MOV TH0,#0F4H
MOV TL0,#048H
MOV P2,#00H
MOV SCANLED,#0
MOV 30H,#8
MOV 31H,#9
SETB EA
SETB ET0
SETB TR0
SJMP $
;--------------------
T0ISR:
PUSH ACC
CLR TR0
MOV TH0,#0F4H
MOV TL0,#48H
SETB TR0
MOV DPTR,#LEDTAB1
T000:
MOV R0,#DAT
MOV A,SCANLED
ADD A,R0
MOV R0,A
MOV A,SCANLED
JNZ T001
MOV P2,#02H
SJMP T0DIS
T001:
MOV P2,#01H
T0DIS:
MOV A,@R0
MOVC A,@A+DPTR
CPL A
MOV P0,A
INC SCANLED
MOV A,SCANLED
ANL A,#01H
MOV SCANLED,A
POP ACC
RETI
;--------------------
LEDTAB1:
DB 0C0H ;"0" 00H
DB 0F9H ;"1" 01H
DB 0A4H ;"2" 02H
DB 0B0H ;"3" 03H
DB 99H ;"4" 04H
DB 92H ;"5" 05H
DB 82H ;"6" 06H
DB 0F8H ;"7" 07H
DB 80H ;"8" 08H
DB 90H ;"9" 09H
DB 88H ;"A" 0AH
DB 83H ;"B" 0BH
DB 0C6H ;"C" 0CH
DB 0A1H ;"D" 0DH
DB 86H ;"E" 0EH
DB 8EH ;"F" 0FH
DB 0FFH ;" " 10H
;--------------------
END