【導(dǎo)讀】器為核心，輔以必要的電路，構(gòu)成的一個單片機電子數(shù)字音樂盒。而演奏樂曲，開機時有英文歡迎提示字符，proteus軟件來仿真，檢驗功能得以正常實現(xiàn)。擇不同的曲目，播放和暫停，并通過LCD顯示歌曲號及播放時間。本設(shè)計鍵盤采用動態(tài)掃描方式?？诘臓顟B(tài)值，判斷有沒有鍵按下。若有鍵按下，根據(jù)讀入口的值選擇顯示值并送。擇的音樂的代碼的首地址，根據(jù)代碼產(chǎn)生一定頻率的脈沖，驅(qū)動蜂鳴器，放出音。同時啟動定時器T1，計算音樂的播放的時間。本設(shè)計中用到了89C51單片機，4*4矩陣式鍵盤，蜂鳴器，14引腳的LCD，可以通過以下原理框圖（圖）來實現(xiàn)該音樂盒的設(shè)計。分，功能鍵盤部分，蜂鳴器發(fā)聲部分，彩燈部分。數(shù)碼管采用共陽極數(shù)碼管，通。且本方案是采用我們所熟知的單片機類型和顯示電路，便于我們理解。而方案二中其他電路部分與方案一相差不大，但系統(tǒng)實現(xiàn)比較困難。動蜂鳴器，放出樂曲。

　　

【正文】 ALL DELAY30 INC 40H LCALL KS 。有鍵跳出 JNZ STOP LJMP NEXT20 STOP: CLR TR0 CLR TR1 LJMP MAIN0 數(shù)字音樂盒的設(shè)計 27 TTM12: LCALL K2 MOV A,37H CJNE A,0EH,TTM13 CLR TR1 LCALL DELAY1 TTM120: LCALL KS LCALL DELAY1 JZ TTM120 LCALL K2 MOV A,37H CJNE A,0EH,TTM120 SETB TR1 LJMP NEXT20 TTM13: CJNE A,0CH,TTM14 MOV A,52H INC A MOV 52H,A MOV A,53H INC A MOV 53H,A MOV A,36H INC A MOV 37H,A LJMP TTM2 TTM14: CJNE A,0DH,TTM2 MOV A,52H DEC A MOV 52H,A MOV A,53H DEC A 數(shù)字音樂盒的設(shè)計 28 MOV 53H,A MOV A,36H DEC A MOV 37H,A TTM2: RET 定時器中斷子程序 0 TT0: PUSH ACC PUSH PSW MOV TL0,20H MOV TH0,21H CPL POP PSW POP ACC RETI 定時器中斷子程序 1 T1INT: MOV TH1, 3cH MOV TL1, 0b0H DJNZ L50MS,X4 MOV L50MS,20 每 秒種時鐘刷新秒顯示一次 SECSET: MOV A,SEC MOV B,10 DIV AB ADD A,30H MOV P0,0CEH 。顯示秒十位 lCALL ENABLE lCALL WRITE2 MOV A,B ADD A,30H MOV P0,0CFH 。顯示秒個位 lCALL ENABLE lCALL WRITE2 數(shù)字音樂盒的設(shè)計 29 MOV A,SEC INC A MOV SEC,A XRL A,60 X4: JNZ OUT MINSET: MOV SEC,00H MOV A,MIN INC A MOV MIN,A MOV B,10 DIV AB ADD A,30H MOV P0,0CBH 。顯示分十位 lCALL ENABLE lCALL WRITE2 MOV A,B ADD A,30H MOV P0,0CCH 。顯示分個位 lCALL ENABLE lCALL WRITE2 MOV A,MIN MOV B,3 MUL AB MOV B,100 DIV AB MOV R2,A MOV A,10 XCH A,B DIV AB MOV A,MIN XRL A,60 數(shù)字音樂盒的設(shè)計 30 JNZ OUT HOUSET: MOV MIN,00H MOV A,HOU MOV B,10 DIV AB ADD A,30H 。將 BCD 嗎轉(zhuǎn)化為 ASIIC 碼 MOV P0,0C8H 。顯示小時十位 CALL ENABLE CALL WRITE2 MOV A,B ADD A,30H MOV P0,0C9H 。顯示小時個位 CALL ENABLE CALL WRITE2 MOV A,HOU INC A MOV HOU,A XRL A,10 JNZ OUT SJMP OVERFLOW OUT: RETI OVERFLOW: MOV L50MS,20 MOV L1MS,00H MOV L250MS,00H MOV SEC,00H MOV MIN,00H MOV HOU,00H RETI DELAY30: MOV R7,2 數(shù)字音樂盒的設(shè)計 31 W2: MOV R4,125 W3: MOV R3,248 DJNZ R3,$ DJNZ R4,W3 DJNZ R7,W2 DJNZ R1,DELAY30 RET TABLE00: DW 64580,64684,64777,64820 DW 64898,64968,65030,64260 DW 64400,64524,65058,63835,64021 第一首《精忠報國》 TABLE10: DB 66H,52H,36H,22H,12H,12H,22H,32H,98H,84H,82H,92H,14H,12H,22H DB 32H,52H,22H,42H,38H,66H,52H,36H,22H,12H,22H,22H,32H,98H DB 24H,22H,32H,54H,52H,32H,92H,12H,92H,82H,98H,66H,52H,36H,22H DB 12H,12H,22H,32H,98H,84H,82H,92H,14H,12H,22H,32H,52H,22H,42H,38H DB 66H,52H,36H,22H,12H,22H,22H,32H,98H,24H,22H,32H,54H,52H,32H DB 22H,12H,92H,82H,98H,14H,24H,34H,44H,64H,0B4H,64H,32H,52H DB 62H,0B2H,62H,52H,38H,24H,22H,32H,54H,52H,62H,52H,32H,32H,22H,38H DB 64H,0B4H,64H,32H,52H,62H,0B2H,62H,52H,38H,22H,22H,22H,32H,52H,52H DB 52H,62H,7FH,74H,04H,58H,6FH DB 00 。第二首《月亮代表我的心》 TABLE20: DB 02H,82H DB 16H,32H,54H,02H,52H DB 0A6H,32H,54H,02H,52H 數(shù)字音樂盒的設(shè)計 32 DB 64H,74H,0B6H,64H DB 52H,5CH,32H,22H DB 16H,12H,14H,32H,22H DB 16H,12H,14H,22H,32H DB 26H,12H,94H,22H,32H DB 2CH DB 32H,52H DB 36H,22H,14H,54H DB 0ACH,92H,0A2H DB 96H,0A2H,96H,82H DB 3CH,54H DB 36H,22H,14H,54H DB 0ACH,92H,0A2H DB 16H,12H,14H,22H,32H DB 16H,12H,14H,22H,32H DB 2CH,02H,82H DB 16H,32H,56H,12H DB 0A6H,32H,56H,52H DB 66H,72H,0B6H,62H DB 62H,52H,58H,32H,22H DB 16H,12H,14H,32H,22H DB 16H,12H,14H,22H,32H DB 26H,92H,0A4H,12H,22H DB 1CH DB 00 第三首《看我七十二變》 TABLE30: DB 0d4H,84H,94H,82H,92H DB 12H,22H,82H,92H,02H,92H,82H,0d2H DB 82H,92H,14H,84H,02H,0d1H,0d1H DB 0c2H,0d2H,84H,0d2H,0d2H,82H,82H DB 84H,82H,82H,94H,82H,0d2H DB 82H,82H,82H,92H,02H,82H,82H,0d2H 數(shù)字音樂盒的設(shè)計 33 DB 0c4H,84H,0d4H,92H,0d2H DB 82H,0d2H,82H,92H,98H DB 04H,94H,88H DB 04H,94H,88H DB 04H,94H,88H DB 04H,94H,88H,04H DB 32H,32H,22H,12H,02H,92H,12H,92H DB 32H,32H,22H,12H,02H,92H,12H,92H DB 32H,32H,22H,12H,02H,92H,12H,22H DB 54H,44H,34H,12H,22H DB 34H,22H,12H,02H,92H,12H,92H DB 32H,32H,22H,12H,02H,92H,12H,92H DB 32H,32H,22H,12H,02H,92H,12H,22H DB 54H,44H,32H,22H,12H,92H DB 00 END 附錄二：基于單片機的數(shù)字音樂 盒總電路圖 數(shù)字音樂盒的設(shè)計 I