music.asm

本系统以Atmel的AT89c52单片机为主控制器

        STH0    EQU 31H
        STL0    EQU 32H
        TEMP    EQU 33H
        T1_BUF1 EQU 34H
        T1_BUF2 EQU 35H
        ORG     0000H
        LJMP    START
        ORG     000BH
        LJMP    INT_T0
        ORG     001BH
        LJMP    INT_T1
START:  MOV     TMOD,#11H
        SETB    ET0
        SETB    EA
        MOV     TH1,#3CH
        MOV     TL1,#0B0H
        SETB    ET1

LOOP:   JB      P3.5,$

        JNB     P3.5,$
        MOV     A,P1
        MOV     40H,A
        ANL     A,#0F0H
        JZ      LOOP1
        SWAP    A
        MOV     B,#5
        MUL     AB
        MOV     T1_BUF1,A
        SETB    TR1
LOOP1:  MOV     A,40H
        ANL     A,#0FH
        CJNE    A,#0FH,LOOP2
        CLR     TR0
        LJMP    LOOP
LOOP2:  RL      A
        MOV     B,A
        MOV     DPTR,#TABLE1
        MOVC    A,@A+DPTR
        MOV     TH0,A
        MOV     STH0,A
        MOV     A,B
        INC     A
        MOVC    A,@A+DPTR
        MOV     TL0,A
        MOV     STL0,A
        SETB    TR0
        LJMP    LOOP





INT_T0:
        MOV     TH0,STH0
        MOV     TL0,STL0
        CPL     P3.7
        RETI
INT_T1:
        MOV     TH1,#3CH
        MOV     TL1,#0B0H
        DJNZ    T1_BUF1,INT1_EXIT
        CLR     TR0
        CLR     TR1
INT1_EXIT:RETI


TABLE1: DW 63742,63843,64029,64195
        DW 64342,64409,64533,64644
        DW 64695,64787,64870,64943
        END