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        <P align=justify>40H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>00H </FONT></P></TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD></TR>
    <TR>
      <TD vAlign=top width="9%"><FONT face=宋体 lang=ZH-CN size=3>
        <P align=justify>地址 </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>0BH </FONT></P></TD>
      <TD vAlign=top width="9%"><FONT face=Arial size=3>
        <P align=justify>0CH </FONT></P></TD>
      <TD vAlign=top width="9%"><FONT face=Arial size=3>
        <P align=justify>0DH </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>0EH </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>0FH </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>10H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>11H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>12H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>13H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>14H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>15 </FONT></P></TD></TR></TBODY></TABLE>
  <P align=justify><FONT face=宋体 lang=ZH-CN size=3>由上面的映象图可知</FONT><FONT 
  face=Arial size=3>,</FONT><FONT face=宋体 lang=ZH-CN 
  size=3>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><FONT face=Arial size=3></FONT><FONT face=宋体 lang=ZH-CN 
  size=3>例２：</FONT></P><FONT face=Arial size=3>
  <P align=justify><I>INT_0 EQU 1000H</I></P><I>
  <P align=justify>TIME_0 EQU 1010H</P>
  <P align=justify>INT_1 EQU 1020H</P>
  <P align=justify>TIME_1 EQU 1030H</P>
  <P align=justify>SERIAL EQU 1040H</P></I></FONT>
  <P align=justify><I><FONT face=Arial size=3>AJMP START ;</FONT></I><I><FONT 
  face=宋体 lang=ZH-CN size=3>跳转到主程序起始点</FONT></I></P><I><FONT face=Arial size=3>
  <P align=justify>ORG 0003H</P></FONT>
  <P align=justify><FONT face=Arial size=3>LJMP INT_0 ;</FONT><FONT face=宋体 
  lang=ZH-CN size=3>外中断</FONT><FONT face=Arial size=3>0</FONT><FONT face=宋体 
  lang=ZH-CN size=3>处理程序</FONT></P><FONT face=Arial size=3>
  <P align=justify>ORG 000BH</P></FONT>
  <P align=justify><FONT face=Arial size=3>LJMP TIME_0 ;</FONT><FONT face=宋体 
  lang=ZH-CN size=3>定时中断</FONT><FONT face=Arial size=3>0</FONT><FONT face=宋体 
  lang=ZH-CN size=3>处理程序</FONT></P><FONT face=Arial size=3>
  <P align=justify>ORG 0013H</P></FONT>
  <P align=justify><FONT face=Arial size=3>LJMP INT_1 ;</FONT><FONT face=宋体 
  lang=ZH-CN size=3>外中断</FONT><FONT face=Arial size=3>1</FONT><FONT face=宋体 
  lang=ZH-CN size=3>处理程序</FONT></P><FONT face=Arial size=3>
  <P align=justify>ORG 001BH</P></FONT>
  <P align=justify><FONT face=Arial size=3>LJMP TIME_1 ;</FONT><FONT face=宋体 
  lang=ZH-CN size=3>定时中断</FONT><FONT face=Arial size=3>1</FONT><FONT face=宋体 
  lang=ZH-CN size=3>处理程序</FONT></P><FONT face=Arial size=3>
  <P align=justify>ORG 0023H</P></FONT>
  <P align=justify><FONT face=Arial size=3>LJMP SERIAL ;</FONT><FONT face=宋体 
  lang=ZH-CN size=3>串行口中断程序</FONT></P><FONT face=Arial size=3>
  <P align=justify>START:</P>
  <P align=justify>NOP</P>
  <P align=justify>END</P></FONT></I>
  <P align=justify><FONT face=Arial size=3><I></I></FONT><FONT face=宋体 
  lang=ZH-CN size=3>上面的程序经过汇编后列表文件如下：</FONT></P><I><FONT face=Arial size=3>
  <P align=justify>The Cybernetic Micro Systems 8051 Family Assembler, Version 
  3.03 Page 1</P>
  <P align=justify>08-26-96</P>
  <P align=justify>1000 = INT_0 EQU 1000H</P>
  <P align=justify>1010 = TIME_0 EQU 1010H</P>
  <P align=justify>1020 = INT_1 EQU 1020H</P>
  <P align=justify>1030 = TIME_1 EQU 1030H</P>
  <P align=justify>1040 = SERIAL EQU 1040H</P></FONT>
  <P align=justify><FONT face=Arial size=3>0000 0126 AJMP START ;</FONT><FONT 
  face=宋体 lang=ZH-CN size=3>跳转到主程序起始点</FONT></P><FONT face=Arial size=3>
  <P align=justify>0003 ORG 0003H</P></FONT>
  <P align=justify><FONT face=Arial size=3>0003 021000 LJMP INT_0 ;</FONT><FONT 
  face=宋体 lang=ZH-CN size=3>外中断</FONT><FONT face=Arial size=3>0</FONT><FONT 
  face=宋体 lang=ZH-CN size=3>处理程序</FONT></P><FONT face=Arial size=3>
  <P align=justify>000B ORG 000BH</P></FONT>
  <P align=justify><FONT face=Arial size=3>000B 021010 LJMP TIME_0 ;</FONT><FONT 
  face=宋体 lang=ZH-CN size=3>定时中断</FONT><FONT face=Arial size=3>0</FONT><FONT 
  face=宋体 lang=ZH-CN size=3>处理程序</FONT></P><FONT face=Arial size=3>
  <P align=justify>0013 ORG 0013H</P></FONT>
  <P align=justify><FONT face=Arial size=3>0013 021020 LJMP INT_1 ;</FONT><FONT 
  face=宋体 lang=ZH-CN size=3>外中断</FONT><FONT face=Arial size=3>1</FONT><FONT 
  face=宋体 lang=ZH-CN size=3>处理程序</FONT></P><FONT face=Arial size=3>
  <P align=justify>001B ORG 001BH</P></FONT>
  <P align=justify><FONT face=Arial size=3>001B 021030 LJMP TIME_1 ;</FONT><FONT 
  face=宋体 lang=ZH-CN size=3>定时中断</FONT><FONT face=Arial size=3>1</FONT><FONT 
  face=宋体 lang=ZH-CN size=3>处理程序</FONT></P><FONT face=Arial size=3>
  <P align=justify>0023 ORG 0023H</P></FONT>
  <P align=justify><FONT face=Arial size=3>0023 021040 LJMP SERIAL ;</FONT><FONT 
  face=宋体 lang=ZH-CN size=3>串行口中断程序</FONT></P><FONT face=Arial size=3>
  <P align=justify>START:</P>
  <P align=justify>0026 00 NOP</P>
  <P align=justify>0000 END</P>
  <P align=justify>The Cybernetic Micro Systems 8051 Family Assembler, Version 
  3.03 Page 2</P>
  <P align=justify>08-26-96</P>
  <P align=justify>;%T Symbol Name Type Value</P>
  <P align=justify>INT_0 . . . . . . . . . . . . . I 1000</P>
  <P align=justify>INT_1 . . . . . . . . . . . . . I 1020</P>
  <P align=justify>SERIAL. . . . . . . . . . . . . I 1040</P>
  <P align=justify>START . . . . . . . . . . . . . L 0026</P>
  <P align=justify>TIME_0. . . . . . . . . . . . . I 1010</P>
  <P align=justify>TIME_1. . . . . . . . . . . . . I 1030</P>
  <P align=justify>;%Z</P>
  <P align=justify>00 Errors (0000)</P></FONT></I>
  <P align=justify><FONT face=Arial size=3></FONT><FONT face=宋体 lang=ZH-CN 
  size=3>由列表文件，可以绘出代码在ＲＯＭ中的映象图如下：</FONT></P>
  <TABLE border=0 cellPadding=1 cellSpacing=0 width=556>
    <TBODY>
    <TR>
      <TD vAlign=top width="8%"><FONT face=宋体 lang=ZH-CN size=3>
        <P align=justify>代码 </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>01H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>11H </FONT></P></TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>02H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>10H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>00H </FONT></P></TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD></TR>
    <TR>
      <TD vAlign=top width="8%"><FONT face=宋体 lang=ZH-CN size=3>
        <P align=justify>地址 </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>00H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>01H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>02H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>03H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>04H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>05H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>06H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>07H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>08H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>09H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>0AH </FONT></P></TD></TR>
    <TR>
      <TD vAlign=top width="8%"><FONT face=宋体 lang=ZH-CN size=3>
        <P align=justify>代码 </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>02H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>10H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>10H </FONT></P></TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>02H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>01H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>20H </FONT></P></TD></TR>
    <TR>
      <TD vAlign=top width="8%"><FONT face=宋体 lang=ZH-CN size=3>
        <P align=justify>地址 </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>0BH </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>0CH </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>0DH </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>0EH </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>0FH </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>10H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>11H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>12H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>13H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>14H </FONT></P></TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify>15H </FONT></P></TD></TR>
    <TR>
      <TD vAlign=top width="8%"><FONT face=宋体 lang=ZH-CN size=3>
        <P align=justify>代码 </FONT></P></TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%">　</TD>
      <TD vAlign=top width="8%"><FONT face=Arial size=3>
        <P align=justify></FONT></P></TD>
1234

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