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简易数字电压表的设计2 利用单片机AT89S51与ADC0809设计一个数字电压表

</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>JZ NOKEY1<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOV A,P3<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>ANL A,#0FH<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>CJNE A,#0EH,NK1<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOV KEYBUF,#0<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>LJMP DK1<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">NK1:<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>CJNE A,#0DH,NK2<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOV KEYBUF,#1<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>LJMP DK1<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">NK2:<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>CJNE A,#0BH,NK3<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOV KEYBUF,#2<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>LJMP DK1<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">NK3:<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>CJNE A,#07H,NK4<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOV KEYBUF,#3<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>LJMP DK1<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">NK4:<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>NOP<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">DK1:<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
</span><o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOV A,KEYBUF<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOV DPTR,#TABLE<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOVC A,@A+DPTR<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOV P0,A<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><o:p>
<font face="Times New Roman">&nbsp;</font></o:p>
</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">DK<st1:chmetcnv 
w:st="on" UnitName="a" SourceValue="1" HasSpace="False" Negative="False" 
NumberType="1" TCSC="0">
1A</st1:chmetcnv>
:<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>MOV 
A,P3<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>ANL A,#0FH<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>XRL A,#0FH<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>JNZ DK<st1:chmetcnv w:st="on" 
UnitName="a" SourceValue="1" HasSpace="False" Negative="False" NumberType="1" 
TCSC="0">
1A</st1:chmetcnv>
<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">NOKEY1:<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOV P3,#0FFH<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>CLR P3.5<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOV A,P3<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>ANL A,#0FH<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>XRL A,#0FH<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>JZ NOKEY2<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>LCALL DELY10MS<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>MOV A,P3<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 10pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</span>ANL A,#0FH<o:p>
</o:p>