masm3.htm

本单片机教程是平凡老师花了大量时间

        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">10H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">00H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">02H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">10H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">10H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">02H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">10H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">20H 
        </font></td>
    </tr>
    <tr> 
      <td width="9%" valign="TOP"> <font face="宋体" lang="ZH-CN" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">地址 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">00H 
        </font></td>
      <td width="9%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">01H 
        </font></td>
      <td width="9%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">02H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">03H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">04H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">05H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">06H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">07H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">08H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">09H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">0AH 
        </font></td>
    </tr>
    <tr> 
      <td width="9%" valign="TOP"> <font face="宋体" lang="ZH-CN" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">代码 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">02H 
        </font></td>
      <td width="9%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">10H 
        </font></td>
      <td width="9%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">30H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">02H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">10H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">40H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">00H 
        </font></td>
      <td width="8%" valign="TOP">
      <p style="line-height: 150%; margin-top: 0; margin-bottom: 0">　</td>
      <td width="8%" valign="TOP">
      <p style="line-height: 150%; margin-top: 0; margin-bottom: 0">　</td>
      <td width="8%" valign="TOP">
      <p style="line-height: 150%; margin-top: 0; margin-bottom: 0">　</td>
      <td width="8%" valign="TOP">
      <p style="line-height: 150%; margin-top: 0; margin-bottom: 0">　</td>
    </tr>
    <tr> 
      <td width="9%" valign="TOP"> <font face="宋体" lang="ZH-CN" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">地址 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">0BH 
        </font></td>
      <td width="9%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">0CH 
        </font></td>
      <td width="9%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">0DH 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">0EH 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">0FH 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">10H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">11H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">12H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">13H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">14H 
        </font></td>
      <td width="8%" valign="TOP"> <font face="宋体" size=2> 
        <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">15 
        </font></td>
    </tr>
  </table>
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
  <font face="宋体" lang="ZH-CN" size=2>由上面的映象图可知</font><font face="宋体" size=2>,</font><font face="宋体" lang="ZH-CN" size=2>在０３Ｈ处的代码为１０Ｈ，而不是我们要的０２Ｈ，所以外断程序ＩＮＴ＿０不能被正确执行，其它各中断程序的情况同样如此，如在０ＢＨ处，本来存放的应当是定时器０中断程序，但按上述的映象图，０ＢＨ处开始的３个代码是：０２Ｈ，１０Ｈ，３０Ｈ，这是定时器１的入口地址，所以，如果定时器０发生中断，所执行的其实是定时器１的中断程序，这当然不对。</font></p>
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
  <font face="宋体" lang="ZH-CN" size=2>例２：</font></p>
  <font face="宋体" size=2> 
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> <i> INT_0 EQU 1000H</i></p> 
  <i> 
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> TIME_0 EQU 1010H</p>
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> INT_1 EQU 1020H</p>
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> TIME_1 EQU 1030H</p>
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> SERIAL EQU 1040H</p>
  </i></font> 
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><i>
  <font face="宋体" size=2> AJMP START ;</font><font face="宋体" lang="ZH-CN" size=2>跳转到主程序起始点</font></i></p>
  <i> <font face="宋体" size=2> 
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ORG 0003H</p> 
  </font> 
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
  <font face="宋体" size=2> LJMP INT_0 ;</font><font face="宋体" lang="ZH-CN" size=2>外中断</font><font face="宋体" size=2>0</font><font face="宋体" lang="ZH-CN" size=2>处理程序</font></p>
  <font face="宋体" size=2> 
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ORG 000BH</p> 
  </font> 
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
  <font face="宋体" size=2> LJMP TIME_0 ;</font><font face="宋体" lang="ZH-CN" size=2>定时中断</font><font face="宋体" size=2>0</font><font face="宋体" lang="ZH-CN" size=2>处理程序</font></p>
  <font face="宋体" size=2> 
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ORG 0013H</p> 
  </font> 
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
  <font face="宋体" size=2> LJMP INT_1 ;</font><font face="宋体" lang="ZH-CN" size=2>外中断</font><font face="宋体" size=2>1</font><font face="宋体" lang="ZH-CN" size=2>处理程序</font></p>
  <font face="宋体" size=2> 
  <p align="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"> ORG 001BH</p> 
  </font>