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📄 《智能电子钟》的制作详细介绍.htm

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lang=EN-US><SPAN style="mso-field-code: 'SEQ 图表 \* ARABIC'">1</SPAN></SPAN></P>
<P class=MsoNormal><SPAN 
lang=EN-US><![if !supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN 
lang=EN-US><![if !supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=MsoNormal><B><SPAN 
style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">二、电路设计<SPAN 
lang=EN-US><o:p></o:p></SPAN></SPAN></B></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN><SPAN 
style="mso-spacerun: yes">&nbsp;</SPAN>基于上述原因，设计的电路见图二，整个电路用25个元器件。用P1口的8根线驱动LED数码管的段码；用P3口驱动LED数码管的位脚。由于89C2051的I/O脚的上拉内阻有14K左右，无法为LED数码管提供必要的工作电流，特添加了8只1K电阻，使LED数码管的每段电流在2mA左右。数码管全部点亮时电流约16mA小于20mA，89C2051可以安全工作。（元器件表见图3）。<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>为了节省I/O线，键盘处理采用动态扫描方式。先置P30=0，P31=P32=1，再读取P31、P32的状态，如果P31、P32=0，则说明有键按下。进行必要的去抖动处理后，便可得到相应的键值。<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><!--[if gte vml 1]><v:shape id=_x0000_i1026 
style="WIDTH: 488.25pt; HEIGHT: 232.5pt" o:ole="" type = "#_x0000_t75" coordsize 
= "21600,21600"><v:imagedata o:title="" src = 
"./TimerUse.files/image002.png"></v:imagedata></v:shape><![endif]--><![if !vml]><img width=651 height=310
src="./TimerUse.files/image003.jpg" v:shapes="_x0000_i1026"><![endif]><!--[if gte mso 9]><xml>
 <o:OLEObject Type="Embed" ProgID="PBrush" ShapeID="_x0000_i1026"
  DrawAspect="Content" ObjectID="_1161076442">
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</xml><![endif]--></SPAN></P>
<P class=MsoCaption style="TEXT-ALIGN: center" align=center><SPAN 
style="FONT-FAMILY: 黑体; mso-ascii-font-family: Arial">图表</SPAN><SPAN 
lang=EN-US>2</SPAN></P>
<P class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US><![if !supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
align=center><B><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">器</SPAN><SPAN 
lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN></SPAN></B><B><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">件</SPAN><SPAN 
lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN></SPAN></B><B><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">表</SPAN><SPAN 
lang=EN-US><o:p></o:p></SPAN></B></P>
<DIV align=center>
<TABLE 
style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; MARGIN-LEFT: -58.9pt; BORDER-LEFT: medium none; WIDTH: 354.25pt; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt" 
cellSpacing=0 cellPadding=0 width=472 border=1>
  <TBODY>
  <TR style="HEIGHT: 17pt">
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 129.9pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt" 
    vAlign=top width=173>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN 
      style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">名称</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 87.4pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt" 
    vAlign=top width=117>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN 
      style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">型号及参数</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 54.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt" 
    vAlign=top width=73>
      <P class=MsoNormal style="LINE-HEIGHT: 150%"><SPAN 
      style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">数量</SPAN><SPAN 
      lang=EN-US>(</SPAN><SPAN 
      style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">个</SPAN><SPAN 
      lang=EN-US>)</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 82.35pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt" 
    vAlign=top width=110>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN 
      style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">备注</SPAN></P></TD></TR>
  <TR style="HEIGHT: 17pt">
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 129.9pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=173>
      <P class=MsoNormal style="LINE-HEIGHT: 150%"><SPAN 
      style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">数码管</SPAN><SPAN 
      lang=EN-US>0.5’</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 87.4pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=117>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN lang=EN-US>FJS101AH </SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 54.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=73>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN lang=EN-US>4</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 82.35pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=110>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN 
      style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">共阴高亮（红）</SPAN></P></TD></TR>
  <TR style="HEIGHT: 17pt">
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 129.9pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=173>
      <P class=MsoNormal style="LINE-HEIGHT: 150%"><SPAN 
      style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">数码管</SPAN><SPAN 
      lang=EN-US>0.36’</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 87.4pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=117>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN lang=EN-US>LF1036</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 54.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=73>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN lang=EN-US>1</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 82.35pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=110>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN 
      style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">共阴高亮（红）</SPAN></P></TD></TR>
  <TR style="HEIGHT: 17pt">
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 129.9pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=173>
      <P class=MsoNormal style="LINE-HEIGHT: 150%"><SPAN 
      style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">电阻（金膜）</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 87.4pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=117>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN lang=EN-US>1/4W 1K</SPAN><SPAN 
      style="FONT-FAMILY: 宋体">Ω<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN lang=EN-US>1/4W </SPAN><SPAN lang=EN-US 
      style="FONT-FAMILY: 宋体">10Ω</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 54.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=73>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN lang=EN-US>8</SPAN></P>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN lang=EN-US>1</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 82.35pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=110>
      <P class=MsoNormal style="LINE-HEIGHT: 150%"><![if !supportEmptyParas]><![endif]>&nbsp;<SPAN 
      lang=EN-US><o:p></o:p></SPAN></P></TD></TR>
  <TR style="HEIGHT: 17pt">
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 129.9pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=173>
      <P class=MsoNormal style="LINE-HEIGHT: 150%"><SPAN 
      style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">电容（瓷片）</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 87.4pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=117>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center" 
      align=center><SPAN lang=EN-US>104P</SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 54.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" 
    vAlign=top width=73>
      <P class=MsoNormal style="LINE-HEIGHT: 150%; TEXT-ALIGN: center"
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