51单片机 汇编 io发音系列 生日快乐歌

51单片机 汇编 io发音系列 生日快乐歌 org 0000h ajmp main org 000bh jmp tim0 org 0030h main: ;主程序 mov tmod,#01h ;设定时方式 mov ie,#82h ;开中断 start0: mov 30h,#00h ; next: mov a,30h mov dptr,#table movc a,@a+dptr ;查表取音调和节拍 mov r2,a jz end0 ;为零,不进行处理. anl a,#0fh mov r5,a ;将节拍存入R5 mov a,r2 swap a anl a,#0fh jnz sing ;根据音调决定是否演奏. clr tr0 jmp d1 sing: dec a mov 22h,a ;将音调存入22H. rl a mov dptr,#table1 movc a,@a+dptr ;根据音调决定定时器初值. mov th0,a ;放入TH0 mov 21h,a mov a,22h rl a inc a movc a,@a+dptr mov tl0,a ;放入TL0 mov 2 0h,a setb tr0 ;启动定时 d1: call delay inc 30h jmp next end0: clr tr0 jmp start0 tim0: ;定时器中断服务程序 push acc push psw mov tl0,20h ;重赋初值. mov th0,21h cpl p3.3 pop psw pop acc reti delay: mov r7,#02h ;延时子程序 d2: mov r4,#187 d3: mov r3,#248 djnz r3,$ djnz r4,d3 djnz r7,d2 djnz r5,delay ret table1: ;决定音调的定时初值. 0h,a setb tr0 ;启动定时 d1: call delay inc 30h jmp next end0: clr tr0 jmp start0 tim0: ;定时器中断服务程序 push acc push psw mov tl0,20h ;重赋初值. mov th0,21h cpl p3.3 pop psw pop acc reti delay: mov r7,#02h ;延时子程序 d2: mov r4,#187 d3: mov r3,#248 djnz r3,$ djnz r4,d3 djnz r7,d2 djnz r5,delay ret table1: ;决定音调的定时初值.