MOV R0,A LCALL D_BCD MOV 56H,A MOV 57H,#06H SETB F0 LJMP S_PLAY Y7:
CJNE R2,#00H,Y71 LCALL CHECKRE ;查前一个月是否为闰月
CJNE A,#06H,Y72
MOV 56H,#29H ;前一个月是闰月 MOV A,R4 ;R2中为0，则为前一个月
ANL A,#0FH ;的最后一天 JNZ Y73 MOV 56H,#30H MOV 57H,#06H SETB F0 LJMP S_pLAY Y73:
MOV 57H,#06H SETB F0
LJMP S_PLAY Y72:
MOV 56H,#29H ;前一个月不是闰月 MOV A,R6 JB ACC.0,Y74 MOV 56H,#30H Y74:
MOV 57H,#06H CLR F0 LJMP S_PLAY Y71:
MOV A,R2 ;R2中为日的值 MOV R0,A LCALL D_BCD MOV 56H,A MOV 57H,#07H CLR F0
LJMP S_PLAY
RY7:
CJNE R2,#00H,RY71
MOV 56H,#29H ;R2中为0，则为前一
个月
MOV A,R5 ;的最后一天 JB ACC.6,RY72 MOV 56H,#30H RY72:
MOV 57H,#07H CLR F0 LJMP S_PLAY RY71:
MOV A,R2 ;R2中为日的值 MOV R0,A LCALL D_BCD MOV 56H,A MOV 57H,#07H SETB F0
LJMP S_PLAY
Y8:
CJNE R2,#00H,Y81 LCALL CHECKRE ;查前一个月是否为闰月 CJNE A,#07H,Y82
MOV 56H,#29H ;前一个月是闰月 MOV A,R4 ;R2中为0，则为前一个月 ANL A,#0FH ;的最后一天 JNZ Y83
MOV 56H,#30H MOV 57H,#07H SETB F0 LJMP S_PLAY Y83:
MOV 57H,#07H SETB F0
LJMP S_PLAY
Y82:
MOV 56H,#29H ;前一个月不是闰月 MOV A,R5
JB ACC.6,Y84 MOV 56H,#30H Y84:
MOV 57H,#07H CLR F0
LJMP S_PLAY
Y81:
MOV A,R2 ;R2中为日的值
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DL1MS:
MOV R6,#14H DL1:
MOV R7,#19H DL2:
DJNZ R7,DL2 DJNZ R6,DL1 RET
;数据表~~~~~~~~~~~~~~~~~~~`~~ TAB:
DB
35,15H,51H,00H,23,11H,52H,41H,42,12H,65H,00H DB
31,11H,32H,00H,21,42H,52H,21H,39,52H,25H,00H DB
28,25H,04H,71H,48,66H,42H,00H,37,33H,22H,00H
DB
25,15H,24H,51H,44,05H,52H,00H,33,22H,65H,00H DB
22,21H,25H,41H,40,24H,52H,00H,30,52H,42H,91H
DB
49,55H,05H,00H,38,26H,44H,00H,27,53H,50H,60H
DB
46,53H,24H,00H,35,25H,54H,00H,24,41H,
52H,41H
DB
42,45H,25H,00H,31,24H,52H,00H,21,51H,12H,21H DB
40,55H,11H,00H,28,26H,21H,61H,47,26H,61H,00H
DB
36,13H,31H,00H,25,05H,31H,51H,43,12H,54H,00H DB
33,51H,25H,00H,22,42H,25H,31H,41,32H,22H,00H DB
30,55H,02H,71H,49,55H,22H,00H,38,26H,62H,00H
DB
27,13H,64H,60H,45,13H,32H,00H,34,12H,55H,00H
DB
23,10H,53H,51H,42,22H,45H,00H,31,52H,22H,00H DB
21,52H,44H,21H,40,55H,44H,00H,29,26H,50H,71H
DB
47,26H,64H,00H,36,25H,32H,00H,25,23H,32H,50H DB
44,44H,55H,00H,32,24H,45H,00H,22,55H,11H,30H END
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附录三：系统使用说明书
如电路原理总图可知，本电路具有年、月、日、周日、时、分、秒、温度和农历功能， 总共由21个LED数码管显示，如下图-a所示。
图－a
日期和时间的修改由3个按键构成。如图-b所示。键１为向右移；键２为加１；键３为减１。
图－b
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