課程設(shè)計(jì)基于51單片機(jī)三首歌音樂門鈴設(shè)計(jì)(參考版)
2025-06-26 20:25本頁面
【正文】 2 db 62h,82h,82h,62h,92h,92h,94h db 92h,0b2h,0b2h,92h,84h,94h db 0b8h,0b4h,04h db 00h end。2 db 82h,92h,82h,72h,64h,44h db 82h,92h,82h,72h,64h,44h db 44h,84h,48h db 44h,14h,48h db 00hsong2: 。第2首歌 。決定節(jié)拍 retdelay1: MOV r4,20d4: MOV r3,248 djnz r3,$ djnz r4,d4 ret org 300htable: dw 64260,64400,64524,64580 dw 64684,64777,64820,64898 dw 64968,65030,65058,65110 dw 65157,65178,65217song: 。返回主程序delay: MOV r7,02 。至堆棧取回psw的值 pop acc 。重設(shè)計(jì)數(shù)值 MOV th0,21h cpl 。將psw的值暫存于堆棧 setb rs0 ?；氐降?次位置tim0: push acc 。計(jì)次地址(31h)加1 MOV 30h, song2 。消除抖動(dòng) jnb ,$ 。不是則跳至end2 jb ,$ 。載入計(jì)次指針 xrl a,01h 。計(jì)次地址(31h)加1 MOV 30h,song1 。消除抖動(dòng) jnb ,$ 。不是則跳至end1 jb ,$ 。載入計(jì)次指針 xrl a,00h 。取簡譜碼指針加1 jmp nextend0: clr tr0 。取到的低位字節(jié)存入(20h) setb tr0 。至table取相對(duì)的低位字節(jié)計(jì)數(shù)值 MOV tl0,a 。乘2 inc a 。取到的高位字節(jié)存入(21h) MOV a,22h 。至table取碼,取t的值 MOV th0,a 。存入(22h) rl a 。是否為0,是0則不發(fā)音 clr tr0 jmp d1sing: dec
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