📄 单片机坐标实用单片机电子钟的制作.htm
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<TD align=right><FONT
color=#888888>2005年1月20日 作者:luwenxi [<A
href="http://www.mcuzb.com/xxlr.asp?menulb=059单片机简单实例&menujb=2">返回</A>]
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<TD align=middle><FONT style="FONT-SIZE: 11pt"
color=#000000>实用单片机电子钟的制作</FONT></TD></TR></TBODY></TABLE><BR>
<P><FONT color=#454545 font> </FONT><FONT
color=#454545 font> 为
六位数码管时钟程序倚天版直接使用,p3.2,p3.3,p3.4,p3.5
四键控制！转载自<BR>无线电杂志2003年第10期。强烈推荐，实测24小时误差5秒。详细说明见无线电杂志<BR>2003年第10期（注意，有少许改动）</FONT></P>
<P>;;主程序（MAIN），如下：<BR>ORG 0000H<BR>AJMP MAIN<BR>ORG
000BH<BR>AJMP TIME<BR><BR>ORG 0300H<BR>MAIN: <BR>mov
20h,#00h <BR>MOV 21H,#00H<BR>MOV 22H,#00H<BR>MOV
23H,#00H<BR>MOV IP,#02H ;IP,IE初始化<BR>MOV IE,#82H<BR>MOV
TMOD,#01H ;设定定时器工作方式?<BR>MOV TL0,#0B0H<BR>MOV TH0,#3CH<BR>SETB
TR0 ;启动定时?<BR>MOV SP,#40H ;重设堆栈指针<BR>NEXT: LCALL DISP
;调用显示子程序?<BR>LCALL KEY ;调用按键检测子程序<BR>JZ NEXT ;<BR>LCALL ANKEY
;调用按键处理子程序<BR>SJMP NEXT
;重新循环<BR>NOP<BR>NOP<BR>NOP<BR>;定时中断处理程序：<BR>TIME: PUSH ACC
;保护现场<BR>PUSH PSW<BR>MOV TL0,#0B4H ;赋定时初值<BR>MOV
TH0,#3CH<BR>INC 20H ;<BR>MOV A,20H<BR>CJNE A,#20,RETI1<BR>MOV
20H,#00H ;一秒钟时间到<BR>MOV A,21H<BR>ADD A,#01H<BR>DA A<BR>MOV
21H,A<BR>CJNE A,#60H,RETI1<BR>MOV 21H,#00H ;一分钟时间到<BR>MOV
A,22H<BR>ADD A,#01H<BR>DA A<BR>MOV 22H,A<BR>CJNE
A,#60H,RETI1<BR>MOV 22H,#00H ;一小时时间到<BR>MOV A,23H<BR>ADD
A,#01H<BR>DA A<BR>MOV 23H,A<BR>CJNE A,#24H,RETI1<BR>MOV
23H,#00H ;到时间达到24小时,清零.<BR>RETI1: POP PSW ;恢复现场<BR>POP
ACC<BR>RETI ;中断返回?<BR>NOP<BR>NOP<BR><BR>;显示子程序<BR>DISP: ANL
2FH,#10H ;处理小数点<BR>MOV A,21H ;处理秒21H-->2DH,2EH<BR>ANL
A,#0FH<BR>ORL A,2FH<BR>MOV 2FH,A<BR>MOV A,21H <BR>ANL
A,#0F0H<BR>SWAP A<BR>MOV 2EH,A<BR>ANL 2DH,#10H<BR>MOV A,22H
;处理分钟22H-->2CH,2DH<BR>ANL A,#0FH<BR>ORL A,2DH<BR>MOV
2DH,A<BR>MOV A,22H<BR>ANL A,#0F0H<BR>SWAP A<BR>MOV
2CH,A<BR>ANL 2BH,#10H<BR>MOV A,23H
;处理小时23H-->2AH,2BH<BR>ANL A,#0FH<BR>ORL A,2BH<BR>MOV
2BH,A<BR>MOV A,23H<BR>ANL A,#0F0H<BR>SWAP A<BR>MOV
2AH,A<BR>MOV R0,#2FH ;显示偏移量<BR>MOV R3,#06H<BR>MOV
DPTR,#TABLE<BR>MOV A,#0BFH<BR>LOOP1: MOV B,A ;<BR>MOV
P2,a<BR>MOV A,@R0<BR>MOVC A,@A+DPTR<BR>MOV P0,a ;送显示<BR>MOV
R2,#80H ;延时<BR>DJNZ R2,$<BR>DEC R0<BR>MOV A,B<BR>RR A<BR>DJNZ
R3,LOOP1 ;循环显示<BR>RET<BR><BR>TABLE: db
28h,7eh,0a2h,62h,74h,61h,21h ;不带小数点<BR>DB
7ah,20h,60h,00,00,00,00,00,00<BR>DB
8H,5eH,82H,42H,54H,41H,1H,5aH ;带小数点<BR>DB
00H,40H,00,00,00,00,00,00<BR>NOP<BR>NOP<BR>;按键判断程序<BR>KEY: MOV
P3,#0FFH ;<BR>MOV A,P3<BR>CPL A<BR>ANL A,#3CH<BR>JZ RETX
;无键按下则返回<BR>LCALL DISP ;<BR>LCALL DISP<BR>MOV A,P3<BR>CPL
A<BR>ANL A,#3CH<BR>JZ RETX ;键盘去抖动。<BR>MOV R6,A
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