機械基礎(chǔ)設(shè)計要點(編輯修改稿)
2025-07-22 17:36 本頁面
【文章內(nèi)容簡介】 0 。是結(jié)束符? cjne a,0ffh,music5 。是休止符? ljmp music3 。產(chǎn)生100ms停頓music5: nopkey: jnb play,k0 。 jnb addone,k1 。 jnb subone,k2 。 mov r6,a 。音階常數(shù)送R6 inc dptr 。DPTR+1 mov a,0 movc a,@a+dptr 。取常數(shù)送R7 mov r7,a setb tr0 。啟動定時器T0music2: nop cjne r0,0,$ cpl song 。輸出電平取反 mov a, r6 mov r3,a 。音階常數(shù)送R3 lcall del20 mov a, r7 。節(jié)拍常數(shù)送A cjne a,20h,music2 。節(jié)拍時間到否 mov 20h,00h 。為取下一音階作準(zhǔn)備 inc dptr ljmp music1music3: nop 。休止100ms clr tr0 。關(guān)閉定時器 mov r2, 14h 。R2=20music4: nop mov r3, 250 。R3=250 lcall del20 djnz r2, music4 inc dptr 。為取下一音階作準(zhǔn)備 ljmp music1end0: mov r2, 200 。歌曲結(jié)束后,延時1s后繼續(xù)music6: mov r3, 250 lcall del20 djnz r2,music6k1: acall del20 。調(diào)用延時子程序 jnb addone,k1 。 acall nextk2: acall del20 jnb subone,k2 。 acall lastk0: acall del20 jnb play,k0 ljmp start retdel20: mov r4,05hdel4: nop djnz r4,del4 djnz r3,del20 retcont: inc 20h 。計數(shù)單元+1 mov th0,0dbh 。重新10ms定時初值 mov tl0,0ffh reti 。跳出中斷pause: acall del20 jnb ,pause 。 mov a,r0 。把R0的值給A cpl a 。A值取反 mov r0,a retidat1:db 3bh,20h,3bh,20h,30h,20h,33h,20h,3bh,80h,0ffhdb 3bh,20h,3bh,20h,26h,20h,2bh,20h,26h,80h,0ffhdb 26h,20h,26h,20h,20h,20h,26h,20h,2bh,20h,2bh,20h,30h,20h,33h,10h,33h,10hdb 3bh,60h,40h,20h,4ch,80h,0ffhdb 3bh,20h,3bh,20h,30h,20h,33h,20h,3bh,80h,0ffhdb 3bh,20h,3bh,20h,26h,20h,2bh,20h,26h,80h,0ffhdb 26h,20h,26h,20h,20h,20h,26h,20h,2bh,20h,2bh,20h,2bh,20h,30h,20hdb 33h,20h,3bh,20h,3bh,20h,40h,2bh,3bh,80h,0ffhdb 19h,20h,1ch,40h,26h,20h,19h,20h,1ch,40h,26h,20h,0ffhdb 20h,20h,1ch,20h,1ch,20h,20h,20h,26h
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