;code by Dinhhuan
ORG 00H
MOV 30H,#2
MOV 31H,#6
MAIN:
CALL LOOP1
CALL DELAY
CALL LOOP2
CALL DELAY
JMP MAIN
LOOP1:
MOV A,30H
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P0,A
RET
LOOP2:
MOV A,31H
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P0,A
RET
TABLE:
DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H
DELAY: 
MOV R1,#30
LAP1: MOV R2,#90
LAP2: MOV R3,#88
LAP3: DJNZ R3,LAP3
DJNZ R2,LAP2
DJNZ R1,LAP1
RET
; f=12MHZ->TM=1us,T= (((((30*2)+3)*90+3)*88+3)= 499227*1us=0,5s