经典的单片机中断程序使用与初学者

org 0000h ljmp start org 0003h reti org 000bh ljmp intt0 org 0013h reti org 001bh ljmp intt1 org 0023h reti start: mov r0,#70h mov r7,#0bh cleardisp: mov @r0,#00h inc r0 djnz r7,cleardisp mov 20h,#00h mov 7ah,#0ah mov tmod,#11h mov tl0,#0b0h mov th0,#3ch mov th1,#0b0h mov th1,#3ch setb ea setb et0 setb tr0 mov r4,#14h start1: lcall display jnb p3.7,setmm1 sjmp start1 setmm1: ljmp setmm intt0: push acc push psw clr et0 clr tr0 mov a,#0b7h add a,tl0 mov tl0,a mov a,#3ch addc a,th0 mov th0,a setb tr0 djnz r4,outt0 addss: mov r4,#14h mov r0,#71h acall add1 mov a,r3 clr c cjne a,#60h,addmm addmm: jc outt0 acall clr0 mov r0,#77h acall add1 mov a,r3 clr c cjne a,#60h,addhh addhh: jc outt0 acall clr0 mov r0,#79h acall add1 mov a,r3 clr c cjne a,#24h,hour hour: jc outt0 acall clr0 outt0: mov 72h,76h mov 73h,77h mov 74h,78h mov 75h,79h pop psw pop acc setb et0 reti intt1: push acc push psw mov tl1,#0b0h mov th1,#3ch djnz r2,intt1out mov r2,#06h cpl 02h jb 02h,flash1 mov 72h,76h mov 73h,77h mov 74h,78h mov 75h,79h intt1out: pop psw pop acc reti flash1: jb 01h,flash2 mov 72h,7ah mov 73h,7ah mov 74h,78h mov 75h,79h ajmp intt1out flash2: mov 72h,76h mov 73h,77h mov 74h,7ah mov 74h,7ah ajmp intt1out add1: mov a,@r0 dec r0 swap a orl a,@r0 add a,#01h da a mov r3,a anl a,#0fh mov @r0,a mov a,r3 inc r0 swap a anl a,#0fh mov @r0,a ret clr0: clr a mov @r0,a dec r0 mov @r0,a ret setmm: clr et0 clr tr0 lcall dl1s jb p3.7,closedis mov r2,#06h setb et1 setb tr1 set2: jnb p3.7,set1 setb 00h set4: jb p3.7,set3 lcall dl05s jnb p3.7,sethh mov r0,#77h lcall add1 mov a,r3 clr c cjne a,#60h,hhh hhh: jc set4 lcall clr0 clr c ajmp set4 closedis: setb et0 setb tr0 close: jb p3.7,close lcall display jb p3.7,close waith: jnb p3.7,waith ljmp start1 sethh: clr 00h sethh1: jnb p3.7,set5 setb 01h set6: jb p3.7,set7 lcall dl05s jnb p3.7,setout mov r0,#79h lcall add1 mov a,r3 clr c cjne a,#24h,houu houu: jc set6 lcall clr0 ajmp set6 setout: jnb p3.7,setout1 lcall display jnb p3.7,setout clr 01h clr 00h clr 02h clr tr1 clr et1 setb tr0 setb et0 ljmp start1 set1: lcall display ajmp set2 set3: lcall display ajmp set4 set5: lcall display ajmp sethh1 set7: lcall display ajmp set6 setout1: lcall display ajmp setout display: mov r1,#70h mov r5,#0feh play: mov a,r5 mov p3,a mov a,@r1 mov dptr,#tab movc a,@a+dptr mov p1,a lcall dl1ms inc r1 mov a,r5 jnb acc.5,endout rl a mov r5,a ajmp play endout: setb p3.5 mov p1,#0ffh ret tab:db 0c0h,0f9h,0a4h,0b0h,99h,92h,82h,0f8h,80h,90h,0ffh dl1ms: mov r6,#14h dl1: mov r7,#19h dl2: djnz r7,dl2 djnz r6,dl1 ret ds20ms: acall display acall display acall display ret dl1s: lcall dl05s lcall dl05s ret dl05s: mov r3,#20h dl05s1: lcall display djnz r3,dl05s1 ret end