</FONT>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">SETB&#9;SECOND&#9;&#9;;</font><font size="2" FACE="宋體" LANG="ZH-CN">關顯示</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">MOV&#9;A,#DISPBUFF&#9;;</font><font size="2" FACE="宋體" LANG="ZH-CN">顯示緩沖區首地址</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<FONT FACE="System,黑體" LANG="ZH-CN" size="2">ADD&#9;A,Counter&#9;</font></P>
<FONT FACE="System,黑體" LANG="ZH-CN" size="2">
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;MOV&#9;R0,A</P>
</FONT>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">MOV&#9;A,@R0&#9;&#9;;</font><font size="2" FACE="宋體" LANG="ZH-CN">根據計數器的值取相應的顯示緩沖區的值</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">MOV&#9;DPTR,#DISPTAB&#9;;</font><font size="2" FACE="宋體" LANG="ZH-CN">字形表首地址</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">MOVC&#9;A,@A+DPTR&#9;;</font><font size="2" FACE="宋體" LANG="ZH-CN">取字形碼</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">MOV&#9;P0,A&#9;&#9;;</font><font size="2"><FONT FACE="宋體" LANG="ZH-CN">將字形碼送</FONT><FONT FACE="System,黑體" LANG="ZH-CN">P0</FONT></font><font size="2" FACE="宋體" LANG="ZH-CN">位（段口）</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">MOV&#9;A,Counter&#9;;</font><font size="2" FACE="宋體" LANG="ZH-CN">取計數器的值</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">JZ&#9;DISPFIRST&#9;;</font><font size="2"><FONT FACE="宋體" LANG="ZH-CN">如果是</FONT><FONT FACE="System,黑體" LANG="ZH-CN">0</FONT></font><font size="2" FACE="宋體" LANG="ZH-CN">則顯示第一位</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">CLR&#9;SECOND&#9;&#9;;</font><font size="2" FACE="宋體" LANG="ZH-CN">否則顯示第二位</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<FONT FACE="System,黑體" LANG="ZH-CN" size="2">AJMP&#9;DISPNEXT</font></P>
<FONT FACE="System,黑體" LANG="ZH-CN" size="2">
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">DISPFIRST:</P>
</FONT>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">CLR&#9;FIRST&#9;&#9;;</font><font size="2" FACE="宋體" LANG="ZH-CN">顯示第一位&#9;&#9; 
</font></P>
<FONT FACE="System,黑體" LANG="ZH-CN" size="2">
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">DISPNEXT:</P>
</FONT>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">INC&#9;Counter&#9;&#9;;</font><FONT FACE="宋體" LANG="ZH-CN" size="2">計數器加</FONT><font size="2" FACE="System,黑體" LANG="ZH-CN">1</font></P>
<FONT FACE="System,黑體" LANG="ZH-CN" size="2">
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;MOV&#9;A,Counter&#9;</P>
</FONT>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">DEC&#9;A&#9;&#9;;</font><font size="2"><FONT FACE="宋體" LANG="ZH-CN">如果計數器計到</FONT><FONT FACE="System,黑體" LANG="ZH-CN">2</FONT><FONT FACE="宋體" LANG="ZH-CN">，則讓它回</FONT></font><font size="2" FACE="System,黑體" LANG="ZH-CN">0</font></P><FONT FACE="System,黑體" LANG="ZH-CN">
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">DEC&#9;A&#9;&#9;</font>&#9;&#9;</P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">JZ&#9;RSTCOUNT&#9;</font>&#9;</P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">AJMP&#9;DISPEXIT</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2">RSTCOUNT:</font></P>
</FONT>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">MOV&#9;Counter,#0&#9;;</font><font size="2"><FONT FACE="宋體" LANG="ZH-CN">計數器的值只能是</FONT><FONT FACE="System,黑體" LANG="ZH-CN">0</FONT><FONT FACE="宋體" LANG="ZH-CN">或</FONT></font><font size="2" FACE="System,黑體" LANG="ZH-CN">1</font></P><FONT FACE="System,黑體" LANG="ZH-CN">
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2">DISPEXIT:</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">POP&#9;PSW</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">POP&#9;ACC</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">RETI</font></P>
</FONT>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2" FACE="System,黑體" LANG="ZH-CN">DELAY:&#9;&#9;&#9;;</font><font size="2"><FONT FACE="宋體" LANG="ZH-CN">延時</FONT><FONT FACE="System,黑體" LANG="ZH-CN">130</FONT></font><font size="2" FACE="宋體" LANG="ZH-CN">毫秒</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<FONT FACE="System,黑體" LANG="ZH-CN" size="2">PUSH&#9;PSW</font></P><FONT FACE="System,黑體" LANG="ZH-CN">
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">SETB&#9;RS0</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">MOV&#9;R7,#255</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2">D1:&#9;MOV&#9;R6,#255</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2">D2:&#9;NOP</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">NOP</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">NOP</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">NOP</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">DJNZ&#9;R6,D2</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">DJNZ&#9;R7,D1</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">POP&#9;PSW</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">RET</font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2">DISPTAB:DB 28H,7EH,0a4H,64H,72H,61H,21H,7CH,20H,60H </font>&#9;</P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">&#9;
<font size="2">END</font></P>
</FONT><FONT FACE="宋體" LANG="ZH-CN" size="2">
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">從上面的程序可以看出，和靜態顯示相比，動態掃描的程序稍有點復雜，不過，這是值得的。這個程序有一定的通用性，只要改變端口的值及計數器的值就可以顯示更多位數了。下面給出顯示程序的流程圖。</P>
</FONT><FONT FACE="System,黑體" LANG="ZH-CN">
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">
<font size="2">　<IMG SRC="dpj261.gif" width="398" height="409"><IMG SRC="dpj262.gif" width="410" height="273"></font></P>
<P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0"><a href="down/exec81.asm">
<font size="2">程序一</font></a><font size="2"> <a href="down/exec81.hex">程序一之代碼</a> 
  <a href="down/exec82.asm">程序二 </a></font><a href="down/exec82.hex"> 
<font size="2">程序二之代碼</font></a></P>
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