求解单片机程序

ORG 0000H
LJMP STAR
ORG 100H
STAR: clr p2.0
clr p3.6
clr p3.7
MOV DPTR,#0FE00H
LOOP: CLR P3.4
CLR P3.5

MOVX @DPTR,A
MOV R6,#50H
DJNZ R6,$
MOVX A,@DPTR
MOV 30H,A
ANL A,#0FH
LCALL SEG7
SETB P3.5
CLR P3.4
MOV A,#34H
MOV P1,A
LCALL DLY
CLR P3.5
MOV A,30H
ANL A,0F0H
SWAP A
LCALL SEG7
SETB P3.4
CLR P3.5
MOV P1,A
LCALL DLY
SJMP LOOP
SEG7: INC A
MOVC A,@A+PC
RET
DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H
DB 80H,90H,88H,83H,0C6H,0A1H,86H,8EH
DLY: MOV R7,#2
D1: MOV R6,#249
DJNZ R6,$
DJNZ R7,D1
RET
END

这个程序啥意思？谁能帮我解决呀？