【正文】 d,11h ；設置定時器 0 和定時器 1 為工作方式 1 mov th0,3ch ；給定時器 0 高位賦初值 mov th1,0b0h mov tl0,3ch mov tl1,0b0h setb it0 ；設置定時器 0 為邊緣確發(fā)方式 setb it1 setb ea ；打開單片機中斷總允許開關34 setb ex0 ；打開外中斷 0 允許開關 mlab1: jnb f0,$ mov a,72h mov b,71h div ab mov 74h,a mov r2,71hlab2: setb clr f0 setb ex1 jnb f0,$ ；判斷用戶是否按下啟動鍵 clr setb setb tr0 jb tr0,$ setb clr f0 jnb f0,$ clr djnz r2,lab2 clr setb setb tr1 jb tr1,$ clr mov r2,5alarm: setb mov r3,0delay1: nop djnz r3,delay1 clr delay2: nop djnz r3,delay2 djnz r1,alarm clr f0 ljmp mlab1sint1: setb f0 reti35st0: mov th0,3ch mov tl0,0b0h inc timers push acc mov a,timers cjne a,10,t0lab1 pop acc mov timers,0 inc timerm push acc mov a,timerm cjne a,60,t0lab1 pop acc mov timerm,0 mov a,99 add a,72h da a mov r1,72h lcall display push acc mov a,70h cjne a,1,t0lab1 pop acc jnb ,t0lab21 clr setb ljmp t0lab22t0lab21: setb clr t0lab22: inc 75h mov a,74h cjne a,75h,t0lab1 clr tr0t0lab1: reti。***********************。內(nèi)中斷 1。***********************st1: mov th1,3ch mov tl1,0b0h36 inc timers push acc mov a,timers cjne a,10,t1lab1 pop acc mov timers,0 inc timerm push acc mov a,timerm cjne a,60,t1lab1 pop acc mov timerm,0 mov a,99 add a,73h da a mov r1,73h lcall display mov a,73h jnz t1lab1 clr tr1t1lab1:reti。*********************。外中斷 0。*********************sint0: setb ；鍵盤矩陣第一條行線送出高電平 clr ；第二條行線送出低電平 mov a,p3 ；讀回列線狀態(tài) anl a,0c0h cjne a,0c0h,intlab1 ；只保留兩條列線狀態(tài) clr setb mov a,p3 anl a,0c0h orl a,20hintlab1: cjne a,0c0h,intlab3 ；判斷鍵碼是否為 0A0H，即按鍵是否 為“編程選擇”不是則跳轉 inc 76h mov r0,76h cjne @r0,5,intlab2 mov 76h,1 ；若編程狀態(tài)大于 4 則使其為 1intlab2:37 push acc mov a,76h cjne a,1,intlab21 pop acc clr ；使譯碼器輸入端為 100 setb clr retiintlab21: push acc mov a,76h cjne a,2,intlab22 pop acc setb clr clr mov r1,71h lcall display ；調(diào)用顯示子程序 retiintlab22: push acc mov a,76h cjne a,3,intlab23 pop acc setb clr setb mov r1,72h lcall display retiintlab23: setb setb clr mov r1,73h lcall display retiintlab3: cjne a,6,intlab4 。判斷鍵碼是否為 6，即按鍵是否為“增” push acc mov a,76h cjne a,1,intlab31 ；判斷編程狀態(tài)是否為 1 pop acc38 xrl 70h,0ffh ；切換強弱洗狀態(tài) cpl ；切換強弱洗指示燈 retiintlab31: push acc mov a,76h cjne a,2,intlab32 pop acc mov a,1 add a,71h da a mov r1,71h lcall display reti ；中斷返回intlab32:push acc mov a,76h cjne a,3,intlab33 pop acc mov a,1 add a,72h da a mov r1,72h lcall display retiintlab33:mov a,1 add a,73h da a mov r1,73h lcall display retiintlab4:cjne a,8,intlab5 push acc mov a,76h cjne a,1,intlab41 pop acc xrl 70h,0ffh cpl retiintlab41:push acc mov a,76h cjne a,2,intlab42 pop acc mov a,99h add a,71h34 da a mov r1,71h lcall display retiintlab42:push acc mov a,76h cjne a,3,intlab43 pop acc mov a,99h add a,72h da a mov r1,72h lcall display retiintlab43:mov a,99h add a,73h da a mov r1,73h lcall display retiintlab5:setb f0 retidisplay:mov a,r1 swap a anl a ,0fh mov dptr,dislab movc a,@a+dptr mov p0,a mov a,r1 anl a ,0fh movc a,@a+dptr mov p2,a ret end