汇编代码：

SONG    BIT        00H
CHANGE    BIT        01H    
    ORG        0000H        
    JMP        START
    ORG        0003H
    JMP        AINT0
    ORG        000BH
    JMP        EXT0
    ORG        0013H
    JMP        AINT1
START:
    MOV        TCON,#00000000B
    MOV        TMOD,#00000001B
    MOV        IE,#10000111B
    MOV        IP,#00000101B
REPEAT:
    CLR        CHANGE
    JB        SONG, S2
S1:
    MOV        DPTR,#TABLE0
    JMP        LOOP
S2:
    MOV     DPTR,#TABLE1
LOOP:
    CLR        A
    MOVC    A,@A+DPTR
    MOV        R1,A
    INC        DPTR
    CLR        A
    MOVC    A,@A+DPTR
    MOV        R0,A
    ORL        A,R1
    JZ        NEXT0
    MOV        A,R0
    ANL        A,R1
    CJNE    A,#0FFH,NEXT
    JMP        START
NEXT:
    MOV        TH0,R1
    MOV        TL0,R0
    SETB    TR0
    JMP        NEXT1
NEXT0:
    CLR        TR0
NEXT1:
    CLR        A
    INC        DPTR
    MOVC    A,@A+DPTR    
    MOV        R2,A
    JB        CHANGE,REPEAT
LOOP1:
    ACALL    DELAY
    DJNZ    R2,LOOP1
    INC        DPTR
    JMP        LOOP
EXT0:
    MOV        TH0,R1
    MOV        TL0,R0
    CPL        P1.5
    RETI
AINT0:
    SETB    SONG
    SETB    CHANGE
    RETI
AINT1:
    CLR        SONG
    SETB    CHANGE
    RETI
DELAY:
    MOV        R7,#02
D2:
    MOV        R6,#187
D3:
    MOV        R5,#248
    DJNZ    R5,$
    DJNZ    R6,D3
    DJNZ    R7,D2
    RET
TABLE0:
    DB    0FDH,80H,03H,    0FDH,80H,01H
    DB    0FDH,0C6H,04H,  0FDH,80H,04H    
    DB    0FEH,2AH,04H,    0FEH,02H,04H
    DB    00H,00H,04H
    DB    0FDH,80H,03H,    0FDH,80H,01H
    DB    0FDH,0C6H,04H,  0FDH,80H,04H    
    DB    0FEH,5CH,04H,    0FEH,2AH,04H
    DB    00H,00H,04H
    DB  0FDH,80H,03H,    0FDH,80H,01H
    DB  0FEH,0C0H,04H,  0FEH,84H,04H
    DB  0FEH,2AH,04H,    0FEH,02H,04H
    DB  0FDH,0C6H,04H
    DB  0FEH,98H,03H,    0FEH,98H,01H
    DB  0FEH,84H,04H,    0FEH,2AH,04H
    DB  0FEH,5CH,04H,    0FEH,2AH,04H
    DB  0FFH,0FFH
TABLE1:
    DB    0FEH,2AH,02H,    0FEH,2AH,02H
    DB    0FEH,2AH,04H,    0FDH,80H,04H
    DB    0FEH,84H,02H,    0FEH,84H,02H
    DB    0FEH,84H,04H,    0FEH,2AH,04H
    DB    0FEH,2AH,02H,    0FEH,84H,02H
    DB    0FEH,0C0H,04H,    0FEH,0C0H,04H
    DB    0FEH,98H,02H,    0FEH,84H,02H
    DB    0FEH,5CH,08H
    DB    00H,00H,02H
    DB    0FEH,54H,02H
    DB    0FEH,84H,02H,    0FEH,98H,04H
    DB    0FEH,98H,04H,    0FEH,84H,02H
    DB    0FEH,5CH,02H,    0FEH,84H,04H
    DB    0FEH,2AH,04H    
    DB    0FEH,2AH,02H,    0FEH,84H,02H
    DB    0FEH,54H,04H,    0FDH,80H,04H
    DB    0FEH,02H,02H,    0FEH,5CH,02H
    DB  0FEH,2AH,08H
    DB  0FFH,0FFH
    END