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align=left>;;P3.3小喇叭---生日快樂(lè)。<BR>;***************************************************************************<BR>;*
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*<BR>;***************************************************************************<BR>org
0000h<BR>ajmp main<BR>org 000bh<BR>jmp tim0<BR>org 0030h<BR>main:
;主程序<BR>mov tmod,#01h ;設(shè)定時(shí)方式<BR>mov ie,#82h ;開(kāi)中斷<BR>start0:<BR>mov
30h,#00h ;<BR>next: mov a,30h<BR>mov dptr,#table<BR>movc a,@a+dptr
;查表取音調(diào)和節(jié)拍<BR>mov r2,a<BR>jz end0 ;為零,不進(jìn)行處理.<BR>anl a,#0fh<BR>mov r5,a
;將節(jié)拍存入R5<BR>mov a,r2<BR>swap a<BR>anl a,#0fh<BR>jnz sing
;根據(jù)音調(diào)決定是否演奏.<BR>clr tr0<BR>jmp d1<BR>sing: dec a<BR>mov 22h,a
;將音調(diào)存入22H.<BR>rl a<BR>mov dptr,#table1<BR>movc a,@a+dptr
;根據(jù)音調(diào)決定定時(shí)器初值.<BR>mov th0,a ;放入TH0<BR>mov 21h,a<BR>mov a,22h<BR>rl a<BR>inc
a<BR>movc a,@a+dptr<BR>mov tl0,a ;放入TL0<BR>mov 20h,a<BR>setb tr0
;啟動(dòng)定時(shí)<BR>d1: call delay<BR>inc 30h<BR>jmp next<BR>end0: clr tr0<BR>jmp
start0<BR><BR>tim0: ;定時(shí)器中斷服務(wù)程序<BR>push acc<BR>push psw<BR>mov tl0,20h
;重賦初值.<BR>mov th0,21h<BR>cpl p3.3 <BR>pop psw<BR>pop
acc<BR>reti<BR><BR>delay: mov r7,#02h ;延時(shí)子程序<BR>d2: mov r4,#187<BR>d3: mov
r3,#248<BR>djnz r3,$<BR>djnz r4,d3<BR>djnz r7,d2<BR>djnz
r5,delay<BR>ret<BR><BR>table1: ;決定音調(diào)的定時(shí)初值.<BR>dw
64260,64400,64524,64580<BR>dw 64684,64777,64820,64898<BR>dw
64968,65030,65058,65110<BR>dw 65157,65178,65217<BR><BR>table:
;決定音調(diào)和節(jié)拍的表格,不同的歌曲只是此表不同<BR>;1<BR>db
82h,01h,81h,94h,84h,0b4h,0a4h,04h,82h,01h,81h,94h,84h,0c4h,0b4h,04h<BR>;2<BR>db
82h,01h,81h,0f4h,0d4h,0b4h,0a4h,94h,0e2h,01h,0e1h,0d4h,0b4h,0c4h,0b4h,04h<BR>;3<BR>db
82h,01h,81h,94h,84h,0b4h,0a4h,04h,82h,01h,81h,94h,84h,0c4h,0b4h,04h<BR>;4<BR>db
82h,01h,81h,0f4h,0d4h,0b4h,0a4h,94h,0e2h,01h,0e1h,0d4h,0b4h,0c4h,0b4h,04h,00<BR>end<BR></P></TD></TR></TBODY></TABLE></DIV></CENTER></BODY></HTML>
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