数码管显示0-9ORG 0000H
MM0 EQU 50H
MM1 EQU 51H
MM2 EQU 52H
LJMP MAIN
ORG 0030H
MAIN:MOV P3,#0F0H
MOV DPTR,#TAB
MOV R7,#0
LOOP:MOV A,R7
MOVC A,@A+DPTR
MOV P2,A
LCALL DELAY1S
INC R7
CJNE R7,#10,LOOP
MOV R7,#0
SJMP LOOP
DELAY1S:MOV MM0,#10
DELAY1S0:MOV MM1,#200
DELAY1S1:MOV MM2,#248
DJNZ MM2,$
NOP
DJNZ MM1,DELAY1S1
DJNZ MM0,DELAY1S0
RET
TAB:DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H
END