單片機(jī)演奏音樂實(shí)驗(yàn)

        ;標(biāo)題 '八月桂花香'發(fā)聲程序
        ORG 0000H
        LJMP START
        ORG 000BH
        INC 20H       ;中斷服務(wù),中斷計(jì)數(shù)器加1
        MOV TH0,#0D8H
        MOV TL0,#0EFH ;12M晶振，形成10毫秒中斷
        RETI
START:  
        MOV SP,#50H
        MOV TH0,#0D8H
        MOV TL0,#0EFH
        MOV TMOD,#01H
        MOV IE,#82H
MUSIC0: 
        NOP
        MOV DPTR,#DAT ;表頭地址送DPTR
        MOV 20H,#00H  ;中斷計(jì)數(shù)器清0
MUSIC1: 
        NOP
        CLR A         ;A清零
        MOVC A,@A+DPTR;查表取代碼
        JZ END0       ;是00H,則結(jié)束
        CJNE A,#0FFH,MUSIC5   ;如果是休止符，往下執(zhí)行
        LJMP MUSIC3
MUSIC5: 
        NOP
        MOV R6,A      ;R6=18H音符的頻率
        INC DPTR      ;DPTR加一
        MOV A,#0
        MOVC A,@A+DPTR;取節(jié)拍代碼送R7
        MOV R7,A      ;R7=30H音符發(fā)音的時(shí)間
        SETB TR0      ;啟動計(jì)數(shù)
MUSIC2: 
        NOP
        CPL P2.5      ;P2.5是音樂輸出引腳
        MOV A,R6
        MOV R3,A      ;R3=R6=18H
        LCALL DEL
        MOV A,R7
        CJNE A,20H,MUSIC2     ;中斷計(jì)數(shù)器(20H)=R7否?
        ;不等,則繼續(xù)循環(huán)
        MOV 20H,#00H  ;等于,則取下一代碼
        INC DPTR
        LJMP MUSIC1
MUSIC3: 
        NOP           ;休止100毫秒
        CLR TR0
        MOV R2,#0DH   ;R2=13
MUSIC4: 
        NOP
        MOV R3,#0FFH  ;R3=255
        LCALL DEL
        DJNZ R2,MUSIC4
        INC DPTR
        LJMP MUSIC1
END0:   
        NOP
        MOV R2,#0FFH  ;歌曲結(jié)束,延時(shí)1秒后繼續(xù)
MUSIC6: 
        MOV R3,#00H
        LCALL DEL
        DJNZ R2,MUSIC6
        LJMP MUSIC0
DEL:    
        NOP
DEL3:   
        MOV R4,#02H
DEL4:   
        NOP
        DJNZ R4,DEL4
        NOP
        DJNZ R3,DEL3
        RET
        NOP
DAT:    
        DB 18H, 30H, 1CH, 10H
        DB 20H, 40H, 1CH, 10H
        DB 18H, 10H, 20H, 10H
        DB 1CH, 10H, 18H, 40H
        DB 1CH, 20H, 20H, 20H
        DB 1CH, 20H, 18H, 20H
        DB 20H, 80H, 0FFH, 20H
        DB 30H, 1CH, 10H , 18H
        DB 20H, 15H, 20H , 1CH
        DB 20H, 20H, 20H , 26H
        DB 40H, 20H , 20H , 2BH
        DB 20H, 26H, 20H , 20H
        DB 20H, 30H , 80H , 0FFH
        DB 20H, 20H, 1CH , 10H
        DB 18H, 10H, 20H , 20H
        DB 26H, 20H , 2BH , 20H
        DB 30H, 20H , 2BH , 40H
        DB 20H, 20H , 1CH , 10H
        DB 18H, 10H, 20H, 20H
        DB 26H, 20H , 2BH, 20H
        DB 30H, 20H, 2BH , 40H
        DB 20H, 30H, 1CH , 10H
        DB 18H, 20H , 15H , 20H
        DB 1CH, 20H , 20H , 20H
        DB 26H, 40H, 20H , 20H
        DB 2BH, 20H, 26H , 20H
        DB 20H, 20H, 30H , 80H
        DB 20H, 30H, 1CH , 10H
        DB 20H, 10H, 1CH , 10H
        DB 20H, 20H, 26H , 20H
        DB 2BH, 20H, 30H , 20H
        DB 2BH, 40H, 20H , 15H
        DB 1FH, 05H, 20H , 10H
        DB 1CH, 10H, 20H , 20H
        DB 26H, 20H, 2BH , 20H
        DB 30H, 20H, 2BH , 40H
        DB 20H, 30H, 1CH , 10H
        DB 18H, 20H , 15H , 20H
        DB 1CH, 20H , 20H , 20H
        DB 26H, 40H, 20H , 20H
        DB 2BH, 20H, 26H , 20H
        DB 20H, 20H, 30H, 30H
        DB 20H, 30H, 1CH, 10H
        DB 18H, 40H, 1CH, 20H
        DB 20H, 20H, 26H, 40H
        DB 13H, 60H, 18H , 20H
        DB 15H, 40H, 13H , 40H
        DB 18H, 80H, 00H
        END