c8051f320在usb设计中的应用.htm

c8051f32x data sheet

    <p style='text-indent:22.5pt;line-height:140%;word-break:break-all'><span
    style='font-size:10.5pt;line-height:140%;color:#333333'>ＵＳＢ描述符是ＵＳＢ协议定义的一套描述设备功能和属性的固定结构的描述语言。ＵＳＢ２．０中的描述符包括设备描述符、配置描述符、接口描述符、端点描述符等８种标准描述符和其它一些非标准描述符。ＵＳＢ主机通过ＵＳＢ描述符完成设备类型的识别和配置，同时为设备提供相应的客户端驱动程序，运行于ＵＳＢ协议栈上层的客户端驱动程序通过这些信息来正确访问设备并与其通信，从而达到即插即用的目的。其中，配置中用到的两个端点描述符如表１所列。<span
    lang=EN-US><o:p></o:p></span></span></p>
    <p style='line-height:140%;word-break:break-all'><b><span style='font-size:
    10.0pt;line-height:140%;color:#333333'>表<span lang=EN-US>1 </span>端点描述</span></b><span
    lang=EN-US style='font-size:10.0pt;line-height:140%;color:#333333'><o:p></o:p></span></p>
    <table class=MsoNormalTable border=1 cellpadding=0 width=574
     style='width:430.5pt;mso-cellspacing:1.5pt' bordercolordark="#ffffff"
     bordercolorlight="#000000">
     <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes'>
      <td width=39 rowspan=2 style='width:29.25pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>偏移量</span></span><span
      class=main1><span style='font-size:10.5pt;line-height:140%;font-family:
      宋体;mso-bidi-font-family:宋体;color:#333333'> </span></span><span
      lang=EN-US style='font-size:10.5pt;line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=113 rowspan=2 style='width:84.75pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>域</span></span><span
      class=main1><span style='font-size:10.5pt;line-height:140%;font-family:
      宋体;mso-bidi-font-family:宋体;color:#333333'> </span></span><span
      lang=EN-US style='font-size:10.5pt;line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=56 rowspan=2 style='width:42.0pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>大小</span></span><span
      lang=EN-US style='font-size:10.0pt;line-height:140%;color:#333333'><br>
      </span><span class=main1><span style='font-size:10.0pt;line-height:140%;
      font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>（字节）</span></span><span
      class=main1><span style='font-size:10.5pt;line-height:140%;font-family:
      宋体;mso-bidi-font-family:宋体;color:#333333'> </span></span><span
      lang=EN-US style='font-size:10.5pt;line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=167 colspan=2 style='width:125.25pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>端点描述符<span
      lang=EN-US>1</span></span></span><span class=main1><span lang=EN-US
      style='font-size:10.5pt;line-height:140%;font-family:宋体;mso-bidi-font-family:
      宋体;color:#333333'> </span></span><span lang=EN-US style='font-size:10.5pt;
      line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=153 colspan=2 style='width:114.75pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>端点描述符<span
      lang=EN-US>2</span></span></span><span class=main1><span lang=EN-US
      style='font-size:10.5pt;line-height:140%;font-family:宋体;mso-bidi-font-family:
      宋体;color:#333333'> </span></span><span lang=EN-US style='font-size:10.5pt;
      line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
     </tr>
     <tr style='mso-yfti-irow:1'>
      <td width=35 style='width:26.25pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>数值</span></span><span
      class=main1><span style='font-size:10.5pt;line-height:140%;font-family:
      宋体;mso-bidi-font-family:宋体;color:#333333'> </span></span><span
      lang=EN-US style='font-size:10.5pt;line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=132 style='width:99.0pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>说明</span></span><span
      class=main1><span style='font-size:10.5pt;line-height:140%;font-family:
      宋体;mso-bidi-font-family:宋体;color:#333333'> </span></span><span
      lang=EN-US style='font-size:10.5pt;line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=28 style='width:21.0pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>数值</span></span><span
      class=main1><span style='font-size:10.5pt;line-height:140%;font-family:
      宋体;mso-bidi-font-family:宋体;color:#333333'> </span></span><span
      lang=EN-US style='font-size:10.5pt;line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=125 style='width:93.75pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>说明</span></span><span
      class=main1><span style='font-size:10.5pt;line-height:140%;font-family:
      宋体;mso-bidi-font-family:宋体;color:#333333'> </span></span><span
      lang=EN-US style='font-size:10.5pt;line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
     </tr>
     <tr style='mso-yfti-irow:2'>
      <td width=39 style='width:29.25pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span lang=EN-US style='font-size:
      10.0pt;line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;
      color:#333333'>0</span></span><span class=main1><span lang=EN-US
      style='font-size:10.5pt;line-height:140%;font-family:宋体;mso-bidi-font-family:
      宋体;color:#333333'> </span></span><span lang=EN-US style='font-size:10.5pt;
      line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=113 style='width:84.75pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span lang=EN-US style='font-size:
      10.0pt;line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;
      color:#333333'>bLength</span></span><span class=main1><span lang=EN-US
      style='font-size:10.5pt;line-height:140%;font-family:宋体;mso-bidi-font-family:
      宋体;color:#333333'> </span></span><span lang=EN-US style='font-size:10.5pt;
      line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=56 style='width:42.0pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span lang=EN-US style='font-size:
      10.0pt;line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;
      color:#333333'>1</span></span><span class=main1><span lang=EN-US
      style='font-size:10.5pt;line-height:140%;font-family:宋体;mso-bidi-font-family:
      宋体;color:#333333'> </span></span><span lang=EN-US style='font-size:10.5pt;
      line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=35 style='width:26.25pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span lang=EN-US style='font-size:
      10.0pt;line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;
      color:#333333'>0x07</span></span><span class=main1><span lang=EN-US
      style='font-size:10.5pt;line-height:140%;font-family:宋体;mso-bidi-font-family:
      宋体;color:#333333'> </span></span><span lang=EN-US style='font-size:10.5pt;
      line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=132 style='width:99.0pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>描述符字节数</span></span><span
      class=main1><span style='font-size:10.5pt;line-height:140%;font-family:
      宋体;mso-bidi-font-family:宋体;color:#333333'> </span></span><span
      lang=EN-US style='font-size:10.5pt;line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=28 style='width:21.0pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span lang=EN-US style='font-size:
      10.0pt;line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;
      color:#333333'>0x07</span></span><span class=main1><span lang=EN-US
      style='font-size:10.5pt;line-height:140%;font-family:宋体;mso-bidi-font-family:
      宋体;color:#333333'> </span></span><span lang=EN-US style='font-size:10.5pt;
      line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=125 style='width:93.75pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>描述符字节数</span></span><span
      class=main1><span style='font-size:10.5pt;line-height:140%;font-family:
      宋体;mso-bidi-font-family:宋体;color:#333333'> </span></span><span
      lang=EN-US style='font-size:10.5pt;line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
     </tr>
     <tr style='mso-yfti-irow:3'>
      <td width=39 style='width:29.25pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span lang=EN-US style='font-size:
      10.0pt;line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;
      color:#333333'>1</span></span><span class=main1><span lang=EN-US
      style='font-size:10.5pt;line-height:140%;font-family:宋体;mso-bidi-font-family:
      宋体;color:#333333'> </span></span><span lang=EN-US style='font-size:10.5pt;
      line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=113 style='width:84.75pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span lang=EN-US style='font-size:
      10.0pt;line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;
      color:#333333'>bDescriptorType</span></span><span class=main1><span
      lang=EN-US style='font-size:10.5pt;line-height:140%;font-family:宋体;
      mso-bidi-font-family:宋体;color:#333333'> </span></span><span lang=EN-US
      style='font-size:10.5pt;line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=56 style='width:42.0pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span lang=EN-US style='font-size:
      10.0pt;line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;
      color:#333333'>1</span></span><span class=main1><span lang=EN-US
      style='font-size:10.5pt;line-height:140%;font-family:宋体;mso-bidi-font-family:
      宋体;color:#333333'> </span></span><span lang=EN-US style='font-size:10.5pt;
      line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=35 style='width:26.25pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span lang=EN-US style='font-size:
      10.0pt;line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;
      color:#333333'>0x05</span></span><span class=main1><span lang=EN-US
      style='font-size:10.5pt;line-height:140%;font-family:宋体;mso-bidi-font-family:
      宋体;color:#333333'> </span></span><span lang=EN-US style='font-size:10.5pt;
      line-height:140%;color:#333333'><o:p></o:p></span></p>
      </td>
      <td width=132 style='width:99.0pt;padding:.75pt .75pt .75pt .75pt'>
      <p class=MsoNormal align=center style='margin-top:3.75pt;margin-right:
      15.0pt;margin-bottom:3.75pt;margin-left:15.0pt;text-align:center;
      line-height:140%'><span class=main1><span style='font-size:10.0pt;
      line-height:140%;font-family:宋体;mso-bidi-font-family:宋体;color:#333333'>端点描述符类型</span></span><span
      class=main1><span style='font-size:10.5pt;line-height:140%;font-family:
      宋体;mso-bidi-font-family:宋体;color:#333333'> </span></span><span