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📄 数码管显示驱动和键盘扫描控制器ch451及其应用.htm

📁 此为X102单片机 数码管显示电路及编程 键盘输入电路及编程 红外接收电路及编程 红外发送电路及编程 I2C总线电路及编程 计数器电路及编程 发光管电路及编 蜂鸣器电路及编程 扩展口电路及编程 RAM
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<body lang=ZH-CN link=blue vlink=purple style='tab-interval:21.0pt;text-justify-trim:
punctuation'>

<div class=Section1 style='layout-grid:15.6pt'>

<p class=MsoNormal align=center style='text-align:center'><b><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>数码管显示驱动和键盘扫描控制器</span></b><b><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'>CH451</span></b><b><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>及其应用</span></b><b><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'><o:p></o:p></span></b></p>

<p class=MsoNormal style='line-height:150%;word-break:break-all'><strong><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>摘要：</span></strong><span style='font-size:9.0pt;
font-family:宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>介绍一种新型的键盘显示驱动芯片</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>CH451</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>的性能特点和工作原理，给出了</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'>CH451</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>键盘显示驱动芯片与</span><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'>MCS</span><span style='font-size:
9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>－</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>51</span><span
style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>单片机的接口方法与相应的软件驱动程序。</span><span
style='font-size:9.0pt;font-family:"\000B"'> <span lang=EN-US><o:p></o:p></span></span></p>

<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:150%;word-break:break-all'><span lang=EN-US>&nbsp;&nbsp;&nbsp; </span><b><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>关键词：</span></b><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>键盘显示控制；单片机；</span><span
lang=EN-US>CH451</span><span lang=EN-US style='font-size:12.0pt;font-family:
宋体'><o:p></o:p></span></p>

<p style='text-indent:22.5pt;line-height:150%;word-break:break-all'><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>单片机在开发过程中，常常会因为资源不足而不得不大量扩展接口芯片以满足应用系统的需要，其中原因之一是人机界面中的键盘显示占用了系统太多资源，从而造成系统庞大，同时降低了系统的可靠性。在单片机应用系统中，键盘显示通常可采用以下几种方式：</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'><o:p></o:p></span></p>

<p style='text-indent:22.5pt;line-height:150%;word-break:break-all'><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>(</span><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>１</span><span lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>)</span><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>采用并行接口的键盘显示专用芯片８２７９。但８２７９所需外围元件多（显示驱动、译码等）、占用电路板面积大、综合成本高，在中小系统中常常大材小用；</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'><o:p></o:p></span></p>

<p style='text-indent:22.5pt;line-height:150%;word-break:break-all'><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>(</span><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>２</span><span lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>)</span><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>采用通用并行Ｉ／Ｏ芯片扩展（如用８１５５等），但此方案同样需要驱动显示，同时键盘显示扫描还需占用ＣＰＵ大量时间；</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'><o:p></o:p></span></p>

<p style='text-indent:22.5pt;line-height:150%;word-break:break-all'><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>(</span><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>３</span><span lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>)</span><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>采用专用显示控制器，并用ＣＰＵ的Ｉ／Ｏ引脚完成键盘输入（如ＭＣ１４４９９、ＰＳ７２１９、ＭＡＸ７２１９、ＩＣＭ７２１８、ＴＬＣ５９２１等，大多是串行接口并有显示驱动能力，Ｉ／Ｏ占用少）。这种接口方式省去了显示的扫描，而且电路大多也很简单，通常在系统需要的按键较少时比较适用；</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'><o:p></o:p></span></p>

<p style='text-indent:22.5pt;line-height:150%;word-break:break-all'><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>(</span><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>４</span><span lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>)</span><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>采用带Ｉ２Ｃ总线的键盘显示芯片（如显示用ＳＡＡ１０６４，键盘用ＰＣＦ８５７４），不过这种方式对于无Ｉ２Ｃ总线接口的ＣＰＵ来说，编程显得有些不便；</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'><o:p></o:p></span></p>

<p style='text-indent:22.5pt;line-height:150%;word-break:break-all'><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>(</span><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>５</span><span lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>)</span><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>采用串行接口的键盘显示专用芯片，如ＢＣ７２８０／８１、ＨＤ７２７９、ＣＨ４５１等。这类芯片占用ＣＰＵ的资源少，传输速度较快，外围器件要求也较少，在中小系统中都可得到广泛的应用。ＢＣ７２８０／８１与ＨＤ７２７９中已有介绍，本文着重介绍ＣＨ４５１的主要特性及接口应用方法。</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'><br>
<br>
</span><b><span style='font-size:9.0pt;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>１</span></b><b><span style='font-size:9.0pt;
font-family:"\000B"'> </span></b><b><span style='font-size:9.0pt;mso-ascii-font-family:
"\000B";mso-hansi-font-family:"\000B"'>ＣＨ４５１的功能与引脚介绍</span></b><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'><o:p></o:p></span></p>

<p style='text-indent:22.5pt;line-height:150%;word-break:break-all'><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>ＣＨ４５１是一个整合了数码管显示驱动和键盘扫描控制以及μＰ监控的多功能外围芯片。ＣＨ４５１内置ＲＣ振荡电路，可以直接动态驱动８位数码管或者６４位ＬＥＤ，具有ＢＣＤ译码或不译码功能，可实现数据的左移、右移、左循环、右循环、各数字独立闪烁等控制功能。ＣＨ４５１内置大电流驱动级，段电流不小于３０ｍＡ，字电流不小于１６０ｍＡ，并有１６</span><span
style='font-size:9.0pt;font-family:"\000B"'> </span><span style='font-size:
9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:"\000B"'>级亮度控制功能；在键盘控制方面，该器件内置６４键键盘控制器，可实现８×８矩阵键盘扫描，并内置去抖动电路，可提供按键中断与按键释放标志位等功能；在外部接口方面，ＣＨ４５１可选择简洁的１线串行接口或高速４线串行接口，且内置上电复位，可提供高电平有效复位和低电平有效复位两种输出，同时内置看门狗电路Ｗａｔｃｈ－Ｄｏｇ。ＣＨ４５１提供有２８引脚的ＤＩＰ２８与ＳＯＰ２８封装以及ＤＩＰ２４Ｓ封装形式，２８脚与２４脚在功能上稍有差别，它们的引脚定义见表１所列。</span><span
lang=EN-US style='font-size:9.0pt;font-family:"\000B"'><br>
<br>
</span><b><span style='font-size:9.0pt;mso-ascii-font-family:"\000B";
mso-hansi-font-family:"\000B"'>表</span></b><b><span lang=EN-US
style='font-size:9.0pt;font-family:"\000B"'>1 CH451</span></b><b><span
style='font-size:9.0pt;mso-ascii-font-family:"\000B";mso-hansi-font-family:
"\000B"'>的引脚说明</span></b><span lang=EN-US style='font-size:9.0pt;font-family:
"\000B"'><o:p></o:p></span></p>

<table border=1 cellpadding=0 width="100%" style='width:100.0%;mso-cellspacing:
 1.5pt' bordercolordark="#ffffff" bordercolorlight="#000000">
 <tr>
  <td width="13%" style='width:13.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>28</span><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>脚引脚号</span><span lang=EN-US style='font-size:
  9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
  <td width="14%" style='width:14.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>24</span><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>脚引脚号</span><span lang=EN-US style='font-size:
  9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
  <td width="15%" style='width:15.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>引脚名称</span><span lang=EN-US style='font-size:
  9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
  <td width="19%" style='width:19.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=left style='text-align:left'><span style='font-size:
  9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";mso-hansi-font-family:
  "\000B"'>类</span><span lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>&nbsp;
  </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
  "\000B";mso-hansi-font-family:"\000B"'>型</span><span lang=EN-US
  style='font-size:9.0pt;font-family:宋体'><o:p></o:p></span></p>
  </td>
  <td width="39%" style='width:39.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>引</span><span lang=EN-US>&nbsp; </span><span
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>脚</span><span lang=EN-US>&nbsp; </span><span
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>说</span><span lang=EN-US>&nbsp; </span><span
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>明</span><span lang=EN-US style='font-size:9.0pt'><o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td width="13%" style='width:13.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>23<o:p></o:p></span></p>
  </td>
  <td width="14%" style='width:14.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>2<o:p></o:p></span></p>
  </td>
  <td width="15%" style='width:15.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>VCC<o:p></o:p></span></p>
  </td>
  <td width="19%" style='width:19.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>电源</span><span lang=EN-US style='font-size:
  9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
  <td width="39%" style='width:39.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>正电源，持续电流不小于</span><span lang=EN-US
  style='font-size:9.0pt;font-family:"\000B"'>200mA<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td width="13%" style='width:13.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>9<o:p></o:p></span></p>
  </td>
  <td width="14%" style='width:14.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>15<o:p></o:p></span></p>
  </td>
  <td width="15%" style='width:15.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>GND<o:p></o:p></span></p>
  </td>
  <td width="19%" style='width:19.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>电源</span><span lang=EN-US style='font-size:
  9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
  <td width="39%" style='width:39.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>接地，持续电流不小于</span><span lang=EN-US
  style='font-size:9.0pt;font-family:"\000B"'>200mA<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td width="13%" style='width:13.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>25<o:p></o:p></span></p>
  </td>
  <td width="14%" style='width:14.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>4<o:p></o:p></span></p>
  </td>
  <td width="15%" style='width:15.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>LOAD<o:p></o:p></span></p>
  </td>
  <td width="19%" style='width:19.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>输入</span><span lang=EN-US style='font-size:
  9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
  <td width="39%" style='width:39.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>4</span><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>线串行接口的数据加协，带上拉</span><span lang=EN-US
  style='font-size:9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td width="13%" style='width:13.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>26<o:p></o:p></span></p>
  </td>
  <td width="14%" style='width:14.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>5<o:p></o:p></span></p>
  </td>
  <td width="15%" style='width:15.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>DIN<o:p></o:p></span></p>
  </td>
  <td width="19%" style='width:19.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>输入</span><span lang=EN-US style='font-size:
  9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
  <td width="39%" style='width:39.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>4</span><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>线串行接口的数据输入，带上拉</span><span lang=EN-US
  style='font-size:9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td width="13%" style='width:13.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>27<o:p></o:p></span></p>
  </td>
  <td width="14%" style='width:14.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>6<o:p></o:p></span></p>
  </td>
  <td width="15%" style='width:15.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>DCLK<o:p></o:p></span></p>
  </td>
  <td width="19%" style='width:19.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>输入</span><span lang=EN-US style='font-size:
  9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
  <td width="39%" style='width:39.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>串行接口听数据时钟，带上拉，可同时用于看门狗的清除输入</span><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td width="13%" style='width:13.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>24<o:p></o:p></span></p>
  </td>
  <td width="14%" style='width:14.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>3<o:p></o:p></span></p>
  </td>
  <td width="15%" style='width:15.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>DOUT<o:p></o:p></span></p>
  </td>
  <td width="19%" style='width:19.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>输出</span><span lang=EN-US style='font-size:
  9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
  <td width="39%" style='width:39.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>串行接口的数据输出键盘中断</span><span lang=EN-US
  style='font-size:9.0pt;font-family:"\000B"'><o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td width="13%" style='width:13.0%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US style='font-size:9.0pt;font-family:"\000B"'>22</span><span
  style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"\000B";
  mso-hansi-font-family:"\000B"'>～</span><span lang=EN-US style='font-size:
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