综合应用.htm

51 bian cheng bang zhu

  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:10'><b><span
  lang=EN-US>3FEH<o:p></o:p></span></b></p>
  </td>
 </tr>
</table>

<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>由于</span><span lang=EN-US>3F8H</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，</span><span lang=EN-US>3F9H</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>为两个寄存器公用由线路控制寄存器的最高位</span><span
lang=EN-US>DLAB</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>进行选择；</span></p>

<p class=MsoNormal><span lang=EN-US>8250</span><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>通讯编程步骤：</span></p>

<p class=MsoNormal style='margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 18.0pt'><![if !supportLists]><span lang=EN-US style='mso-fareast-font-family:
"Times New Roman"'><span style='mso-list:Ignore'>1）<span style='font:7.0pt "Times New Roman"'>&nbsp;
</span></span></span><![endif]><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>选定波特率：写波特率除数锁存器</span><span
lang=EN-US>BRD</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>，先使线路控制寄存器</span><span lang=EN-US>LCR</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>最高位</span><span lang=EN-US>D7</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>（</span><span
lang=EN-US>DLAB</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>）</span><span lang=EN-US>=1</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，以选择</span></p>

<p class=MsoNormal style='text-indent:18.0pt'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>除数寄存器，然后分别将波特率除数的高八位和低八位写入</span><span
lang=EN-US>BRDH</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>和</span><span lang=EN-US>BRDL</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。</span></p>

<p class=MsoNormal style='margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 18.0pt'><![if !supportLists]><span lang=EN-US style='mso-fareast-font-family:
"Times New Roman"'><span style='mso-list:Ignore'>2）<span style='font:7.0pt "Times New Roman"'>&nbsp;
</span></span></span><![endif]><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>写控制字：将通讯的数据格式写入线路控制寄存器</span><span
lang=EN-US>LCR</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>同时最高位</span><span lang=EN-US>DLAB=0</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>选中发送缓冲器和接收</span></p>

<p class=MsoNormal style='text-indent:18.0pt'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>缓冲器，以便后面的发送和接收。</span></p>

<p class=MsoNormal style='margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2;
tab-stops:list 18.0pt'><![if !supportLists]><span lang=EN-US style='mso-fareast-font-family:
"Times New Roman"'><span style='mso-list:Ignore'>3）<span style='font:7.0pt "Times New Roman"'>&nbsp;
</span></span></span><![endif]><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>传送数据：发送数据时先检查状态寄存器</span><span
lang=EN-US>LSR</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>的</span><span lang=EN-US>D5</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>位（</span><span lang=EN-US>THRE</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>位），发送缓冲器空（</span><span
lang=EN-US>THRE=1</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>），才</span></p>

<p class=MsoNormal style='text-indent:18.0pt'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>能发送数据，写入即时发送；接收数据先检查</span><span
lang=EN-US>LSR</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>的</span><span lang=EN-US>D1</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>（</span><span lang=EN-US>OE</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US><span style='mso-tab-count:1'> </span></span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>位，收到数据</span><span
lang=EN-US>OE=1</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>。</span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>波特率除数锁存器</span><span lang=EN-US>BRD</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>：</span><span lang=EN-US>8250</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>内部时钟</span><span
lang=EN-US>1</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>·</span><span lang=EN-US>8432 MHz</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，</span><span lang=EN-US>BRD=</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>时钟频率</span><span
lang=EN-US>/</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>（</span><span lang=EN-US>16 x </span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>波特率）</span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>例如波特率</span><span lang=EN-US>=1200/s</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>则有：</span><span lang=EN-US>BRD=1843200/</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>（</span><span lang=EN-US>16 x 1200</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>）</span><span lang=EN-US>=0060H</span></p>

<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>控制字（</span><span lang=EN-US>LCR</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>）：</span><span lang=EN-US>0/1</span></p>

<table class=MsoTable3DFx2 border=0 cellspacing=0 cellpadding=0
 style='border-collapse:collapse;mso-yfti-tbllook:480;mso-padding-alt:0cm 5.4pt 0cm 5.4pt'>
 <tr style='mso-yfti-irow:-1'>
  <td width=76 valign=top style='width:2.0cm;border:none;border-right:solid gray 1.0pt;
  mso-border-right-alt:solid gray .75pt;background:silver;mso-shading:white;
  mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:5'><b><span
  lang=EN-US>D7<o:p></o:p></span></b></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;background:silver;mso-shading:
  white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:1'><b><span
  lang=EN-US>D6<o:p></o:p></span></b></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;background:silver;mso-shading:
  white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:1'><b><span
  lang=EN-US>D5<o:p></o:p></span></b></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;background:silver;mso-shading:
  white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:1'><b><span
  lang=EN-US>D4<o:p></o:p></span></b></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;background:silver;mso-shading:
  white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:1'><b><span
  lang=EN-US>D3<o:p></o:p></span></b></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;background:silver;mso-shading:
  white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:1'><b><span
  lang=EN-US>D2<o:p></o:p></span></b></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;background:silver;mso-shading:
  white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:1'><b><span
  lang=EN-US>D1<o:p></o:p></span></b></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;background:silver;mso-shading:
  white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:1'><b><span
  lang=EN-US>D0<o:p></o:p></span></b></p>
  </td>
  <td width=76 rowspan=2 style='width:2.0cm;border-top:none;border-left:none;
  border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;mso-border-bottom-alt:
  solid white .75pt;mso-border-right-alt:solid white .75pt;background:silver;
  mso-shading:white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:9'><b><span
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>数据位</span><span lang=EN-US><o:p></o:p></span></b></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:0'>
  <td width=76 valign=top style='width:2.0cm;border-top:none;border-left:none;
  border-bottom:solid white 1.0pt;border-right:solid gray 1.0pt;mso-border-bottom-alt:
  solid white .75pt;mso-border-right-alt:solid gray .75pt;background:silver;
  mso-shading:white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:68'><span
  lang=EN-US>DLAB</span></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;border-top:solid gray 1.0pt;
  border-left:none;border-bottom:solid white 1.0pt;border-right:none;
  mso-border-top-alt:solid gray .75pt;mso-border-bottom-alt:solid white .75pt;
  background:silver;mso-shading:white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:64'><span
  lang=EN-US>SB</span></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;border-top:solid gray 1.0pt;
  border-left:none;border-bottom:solid white 1.0pt;border-right:none;
  mso-border-top-alt:solid gray .75pt;mso-border-bottom-alt:solid white .75pt;
  background:silver;mso-shading:white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:64'><span
  lang=EN-US>SP</span></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;border-top:solid gray 1.0pt;
  border-left:none;border-bottom:solid white 1.0pt;border-right:none;
  mso-border-top-alt:solid gray .75pt;mso-border-bottom-alt:solid white .75pt;
  background:silver;mso-shading:white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:64'><span
  lang=EN-US>EPS</span></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;border-top:solid gray 1.0pt;
  border-left:none;border-bottom:solid white 1.0pt;border-right:none;
  mso-border-top-alt:solid gray .75pt;mso-border-bottom-alt:solid white .75pt;
  background:silver;mso-shading:white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:64'><span
  lang=EN-US>PEN</span></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;border-top:solid gray 1.0pt;
  border-left:none;border-bottom:solid white 1.0pt;border-right:none;
  mso-border-top-alt:solid gray .75pt;mso-border-bottom-alt:solid white .75pt;
  background:silver;mso-shading:white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:64'><span
  lang=EN-US>STB</span></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;border-top:solid gray 1.0pt;
  border-left:none;border-bottom:solid white 1.0pt;border-right:none;
  mso-border-top-alt:solid gray .75pt;mso-border-bottom-alt:solid white .75pt;
  background:silver;mso-shading:white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:64'><span
  lang=EN-US>WLS1</span></p>
  </td>
  <td width=76 valign=top style='width:2.0cm;border-top:solid gray 1.0pt;
  border-left:none;border-bottom:solid white 1.0pt;border-right:none;
  mso-border-top-alt:solid gray .75pt;mso-border-bottom-alt:solid white .75pt;
  background:silver;mso-shading:white;mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:64'><span
  lang=EN-US>WLS0</span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:1;height:15.0pt'>
  <td width=76 rowspan=4 style='width:2.0cm;border:none;border-right:solid gray 1.0pt;
  mso-border-right-alt:solid gray .75pt;background:silver;mso-shading:white;
  mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt'>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:4'><span
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>其他</span><span lang=EN-US>/</span><span style='font-family:
  宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>除数</span></p>
  <p class=MsoNormal align=center style='text-align:center;mso-yfti-cnfc:4'><span
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>寄存器</span></p>
  </td>
  <td width=76 rowspan=4 style='width:2.0cm;border:none;border-bottom:solid white 1.0pt;
  mso-border-bottom-alt:solid white .75pt;background:silver;mso-shading:white;
  mso-pattern:solid silver;padding:0cm 5.4pt 0cm 5.4pt;height:15.0pt'>
  <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"'>正常</span><span lang=EN-US>/</span><span style='font-family:
  宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>中止</span></p>
  </td>