【正文】 B有效）EIGHT1:MOV A,MIN CJNE A,59H,EIGHT7 MOV A,SECOND CJNE A,59H,EIGHT5。是否等于59分59秒 EIGHT2:MOV A,COUNT。是否到達后半秒 CJNE A,10,EIGHT3 EIGHT3:JC EIGHT7 EIGHT4:CPL SETB NB SJMP EIGHT7 EIGHT5:MOV A,SECOND CJNE A,51H,EIGHT6。是否大于51秒 EIGHT6:JC EIGHT7 JNB 10H,EIGHT7。判斷是否報低音JB FC,EIGHT7。只有FC有效時才輸出SJMP EIGHT2 EIGHT7:CPL FC。用來控制報低音和高音，滿足報低音條件時，高音時調(diào)用一次取反一次RET。******** NINE中斷（T0）計時程序（包含了秒－分－時－日－月－年間的進位及判斷大小月，平閏年）NINE:MOV TH0,3CH。開定時器 MOV TL0,0B0H SETB TR0 INC COUNT MOV A,COUNT CJNE A,20,INEAA SJMP AAA INEAA:LJMP NINE1 AAA:MOV COUNT,0。計時 MOV A,SECOND ADD A,01 DA A。換成bcd碼以方便顯示 MOV SECOND,A CJNE A,60H,INEAA MOV SECOND,0 MOV A,MIN ADD A,01 DA A MOV MIN,A CJNE A,60H,INEAA MOV MIN,0 MOV A,HOUR ADD A,01 DA A MOV HOUR,A CJNE A,24H,INEAA MOV HOUR,0 MOV A,DAY ADD A,01 DA A MOV DAY,A。************************判斷平閏年及大小月 MOV A,MONTH CJNE A,02H,TEN6A MOV A,YEAR。把年由BCD碼換成二進制碼 ANL A,0F0H SWAP A MOV B,10 MUL AB MOV 24H,A MOV A,YEAR ANL A,0FH ADD A,24H JB ,TEN5A。二進制碼后兩位為00表示為閏年 JB ,TEN5A MOV 24H,01 MOV A,DAY CJNE A,30H,NINE1 MOV DAY,1 SJMP NINE0 TEN5A:MOV A,DAY CJNE A,29H,NINE1 MOV DAY,1 SJMP NINE0。**************判斷大小月；大于等于8月時雙月為大月，小于8月時單月為大月 TEN6A:MOV A,MONTH CJNE A,08H,TEN7A TEN7A:JC TEN9A JB 18H,TEN8A MOV A,DAY CJNE A,32H,NINE1 MOV DAY,1 SJMP NINE0 TEN8A:MOV A,DAY CJNE A,31H,NINE1 MOV DAY,1 SJMP NINE0 TEN9A:JNB 18H,TEN10A MOV A,DAY CJNE A,32H,NINE1 MOV DAY,1 SJMP NINE0 TEN10A:MOV A,DAY CJNE A,31H,NINE1 MOV DAY,1。******************* NINE0:MOV A,MONTH ADD A,01 DA A MOV MONTH,A SETB 05H CJNE A,13H,NINE1 MOV MONTH,1 MOV A,YEAR ADD A,01 DA A MOV YEAR,A NINE1:MOV A,MONTH CJNE A,BM,NINE2 MOV A,DAY CJNE A,BD,NINE2 JNB 05H,NINE2 SETB BS NINE2:RETI。*****************************************TEN中斷（T1）預置加一程序由INT0控制其的開啟與關閉。*******************判斷預置項目 TEN:MOV TH1,3CH MOV TL1,0B0H SETB TR1 INC COUNTS MOV A,COUNTS CJNE A,15,TENE MOV COUNTS,0 JB ,RBRB JB ,DAT SJMP TIME DAT: LJMP DATE RBRB:JB ,BDAT LJMP RTIME BDAT:LJMP BDATE TENE:RETI。**********************預置時間 TIME: JNB ,TEN1 MOV A,MIN ADD A,01 DA A MOV MIN,A CJNE A,60H,TENA MOV MIN,0 SJMP TENA TEN1:JNB ,TENA MOV A,HOUR ADD A,01 DA A MOV HOUR,A CJNE A,24H,TENA MOV HOUR,0 TENA:RETI。******************預置日期 DATE:JNB ,TEN3 MOV A,MONTH ADD A,01 DA A MOV MONTH,A CJNE A,13H,TENB MOV MONTH,1 SJMP TENB TEN3:JNB ,TEN4 MOV A,YEAR ADD A,01 DA A MOV YEAR,A SJMP TENB TEN4:JNB ,TENB MOV A,DAY ADD A,01 DA A MOV DAY,A。***************判斷平閏年 MOV A,MONTH CJNE A,02H,TEN6 MOV A,YEAR ANL A,0F0H SWAP A MOV B,10 MUL AB MOV 24H,A MOV A,YEAR ANL A,0FH ADD A,24H JB ,TEN5 JB ,TEN5 MOV A,DAY CJNE A,30H,TENB MOV DAY,1 SJMP TENB TEN5:MOV A,DAY CJNE A,29H,TENB MOV DAY,1 SJMP TENB。**************判斷大小月 TEN6:CJNE A,08H,TEN7 TEN7:JC TEN9 JB 18H,TEN8 MOV A,DAY CJNE A,32H,TENB MOV DAY,1 SJMP TENB TEN8:MOV A,DAY CJNE A,31H,TENB MOV DAY,1 SJMP TENB TEN9:JNB 18H,TEN10 MOV A,DAY CJNE A,32H,TENB MOV DAY,1 SJMP TENB TEN10:MOV A,DAY CJNE A,31H,TENB MOV DAY,1 TENB: RETI。**************************預置鬧鈴時間 RTIME:JNB ,TEN12 MOV A,RM ADD A,01 DA A MOV RM,A CJNE A,60H,TENC MOV RM,0 SJMP TENC TEN12:JNB ,TENC MOV A,RH ADD A,01 DA A MOV RH,A CJNE A,24H,TENC MOV RH,0 TENC:RETI。************************預置生日日期 BDATE:JNB ,TEN14 MOV A,BD ADD A,01 DA A MOV BD,A MOV A,BM CJNE A,02H,TEN15 MOV A,BD CJNE A,30H,TEND MOV BD,1 SJMP TEND TEN15:CJNE A,08H,TEN16 TEN16:JC TEN18 JB 18H,TEN17 MOV A,BD CJNE A,32H,TEND MOV BD,1 SJMP TEND TEN17:MOV A,BD CJNE A,31H,TEND MOV BD,1 SJMP TEND TEN18:JNB 18H,TEN19 MOV A,BD CJNE A,32H,TEND MOV BD,1 SJMP TEND TEN19:MOV A,BD CJNE A,31H,TEND MOV BD,1 SJMP TEND TEN14:JNB ,TEND MOV A,BM ADD A,01 DA A MOV BM,A CJNE A,13H,TEND MOV BM,1 TEND:SETB 05H RETI。*******************************ELEVEN中斷（INT0）控制了預置的開關以及生日信號的清除ELEVEN:JNB SS,ELEVEN1。預置有效時按一次INT0關預置 CLR SS CLR TR1 SJMP ELEVEN3 ELEVEN1:JNB BS,ELEVEN2。預置無效判斷生日信號有效則清除生日信號 CLR 05H CLR BS SJMP ELEVEN3 ELEVEN2:SETB SS。都無效則令預置有效 MOV TH1,3CH MOV TL1,0B0H SETB TR1 ELEVEN3:RETI。***************************************************************TWELVE 延時小程序TWELVE:MOV P1,0 MOV P2,0 DJNZ R0,TWELVE TWELVE1:MOV P1,0 MOV P2,0 DJNZ R0,TWELVE1 RET