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<title>4×4矩阵式键盘识别技术</title>
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<td align="middle"><font style="FONT-SIZE: 11pt" color="#000000">4×4矩阵式键盘识别技术</font></td>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 1cm; TEXT-INDENT: -1cm; TEXT-ALIGN: center; mso-list: l2 level1 lfo1; tab-stops: list 0cm left 54.0pt" align="center"><b style="mso-bidi-font-weight: normal"><i style="mso-bidi-font-style: normal"><span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; font-family: Times New Roman; mso-list: Ignore; mso-fareast-font-family: Arial Black; mso-bidi-font-family: Arial Black" lang="EN-US"> <strong> </strong></span></i></b><span style="FONT-SIZE: 15pt; FONT-FAMILY: 宋体"><font size="2">
桂林电子工业学院 孙安青</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal"><i style="mso-bidi-font-style: normal"><span style="mso-list: Ignore; font-size: 12pt; font-family: 幼圆; mso-bidi-font-family: 幼圆; mso-hansi-font-family: 宋体" lang="EN-US">1．<span style="FONT: 7pt 'Times New Roman'">
</span></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 幼圆; mso-hansi-font-family: 宋体">实验任务<span lang="EN-US"><o:p>
</o:p>
</span></span></i></b></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">如图<st1:chsdate w:st="on"
Year="1899" Month="12" Day="30" IsLunarDate="False" IsROCDate="False">
<span lang="EN-US">4.14.2</span></st1:chsdate>
所示，用<span lang="EN-US">AT89S51</span>的并行口<span lang="EN-US">P1</span>接<span lang="EN-US">4×4</span>矩阵键盘，以<span lang="EN-US">P1.0</span>－<span lang="EN-US">P1.3</span>作输入线，以<span lang="EN-US">P1.4</span>－<span lang="EN-US">P1.7</span>作输出线；在数码管上显示每个按键的“<span lang="EN-US">0</span>－<span lang="EN-US">F</span>”序号。对应的按键的序号排列如图<span lang="EN-US">4.14.1</span>所示</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt"><span lang="EN-US" style="font-family: 宋体; mso-bidi-font-size: 10.5pt"><o:p>
<img style="BORDER-LEFT-COLOR: #000000; FILTER: ; BORDER-BOTTOM-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-RIGHT-COLOR: #000000" alt src="200541858535000.JPG" border="0" width="512" height="384"></o:p>
</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align="center"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">图<st1:chsdate w:st="on"
Year="1899" Month="12" Day="30" IsLunarDate="False" IsROCDate="False">
<span lang="EN-US">4.14.1</span></st1:chsdate>
<span lang="EN-US"><o:p>
</o:p>
</span></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal"><i style="mso-bidi-font-style: normal"><span style="mso-list: Ignore; font-size: 12pt; font-family: 幼圆; mso-bidi-font-family: 幼圆; mso-hansi-font-family: 宋体" lang="EN-US">2．<span style="FONT: 7pt 'Times New Roman'">
</span></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 幼圆; mso-hansi-font-family: 宋体">硬件电路原理图</span></i></b></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal"><i style="mso-bidi-font-style: normal"><span lang="EN-US" style="font-size: 12pt; font-family: 幼圆; mso-hansi-font-family: 宋体"><o:p>
<img style="BORDER-LEFT-COLOR: #000000; FILTER: ; BORDER-BOTTOM-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-RIGHT-COLOR: #000000" alt src="200541858594999.JPG" border="0" width="564" height="396"></o:p>
</span></i></b></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p>
</o:p>
</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align="center"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">图<st1:chsdate w:st="on"
Year="1899" Month="12" Day="30" IsLunarDate="False" IsROCDate="False">
<span lang="EN-US">4.14.2</span></st1:chsdate>
<span lang="EN-US"><o:p>
</o:p>
</span></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal"><i style="mso-bidi-font-style: normal"><span style="mso-list: Ignore; font-size: 12pt; font-family: 幼圆; mso-bidi-font-family: 幼圆; mso-hansi-font-family: 宋体" lang="EN-US">3．<span style="FONT: 7pt 'Times New Roman'">
</span></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 幼圆; mso-hansi-font-family: 宋体">系统板上硬件连线<span lang="EN-US"><o:p>
</o:p>
</span></span></i></b></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 36pt; TEXT-INDENT: -36pt; mso-list: l0 level1 lfo3; tab-stops: list 36.0pt"><span style="mso-list: Ignore; font-family: 宋体; mso-bidi-font-family: 宋体" lang="EN-US">（1．<span style="FONT: 7pt 'Times New Roman'">
</span></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">把“单片机系统“区域中的</span><span lang="EN-US"><font face="Times New Roman">P3.0</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">－</span><span lang="EN-US"><font face="Times New Roman">P3.7</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">端口用</span><span lang="EN-US"><font face="Times New Roman">8</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">芯排线连接到“</span><span lang="EN-US"><font face="Times New Roman">4X4</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">行列式键盘”区域中的</span><span lang="EN-US"><font face="Times New Roman">C1</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">－</span><span lang="EN-US"><font face="Times New Roman">C4</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'"> </span><span lang="EN-US"><font face="Times New Roman">R1</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">－</span><span lang="EN-US"><font face="Times New Roman">R4</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">端口上；</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 36pt; TEXT-INDENT: -36pt; mso-list: l0 level1 lfo3; tab-stops: list 36.0pt"><span style="mso-list: Ignore; font-family: 宋体; mso-bidi-font-family: 宋体; mso-bidi-font-size: 10.5pt" lang="EN-US">（2．<span style="FONT: 7pt 'Times New Roman'">
</span></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">把“单片机系统”区域中的</span><span lang="EN-US"><font face="Times New Roman">P0.0/AD0</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">－</span><span lang="EN-US"><font face="Times New Roman">P0.7/AD7</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">端口用</span><span lang="EN-US"><font face="Times New Roman">8</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">芯排线连接到“四路静态数码显示模块”区域中的任一个</span><span lang="EN-US"><font face="Times New Roman">a</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">－</span><span lang="EN-US"><font face="Times New Roman">h</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">端口上；要求：</span><span lang="EN-US"><font face="Times New Roman">P0.0/AD0</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">对应着</span><span lang="EN-US"><font face="Times New Roman">a</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">，</span><span lang="EN-US"><font face="Times New Roman">P0.1/AD1</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">对应着</span><span lang="EN-US"><font face="Times New Roman">b</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">，</span><span lang="EN-US" style="FONT-FAMILY: 宋体">……</span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">，</span><span lang="EN-US"><font face="Times New Roman">P0.7/AD7</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">对应着</span><span lang="EN-US"><font face="Times New Roman">h</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">。</span><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p>
</o:p>
</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal"><i style="mso-bidi-font-style: normal"><span style="mso-list: Ignore; font-size: 12pt; mso-fareast-font-family: Times New Roman" lang="EN-US"><font face="Times New Roman">4</font>．<font face="Times New Roman"><span style="FONT: 7pt 'Times New Roman'">
</span></font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">程序设计内容</span><span lang="EN-US" style="FONT-SIZE: 12pt"><o:p>
</o:p>
</span></i></b></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 57pt; TEXT-INDENT: -36pt; mso-list: l1 level2 lfo2; tab-stops: list 57.0pt"><span style="mso-list: Ignore; font-family: 宋体; mso-bidi-font-family: 宋体; mso-bidi-font-size: 10.5pt" lang="EN-US">（1．<span style="FONT: 7pt 'Times New Roman'">
</span></span><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">4×4</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">矩阵键盘识别处理<span lang="EN-US"><o:p>
</o:p>
</span></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 57pt; TEXT-INDENT: -36pt; mso-list: l1 level2 lfo2; tab-stops: list 57.0pt"><span style="mso-list: Ignore; font-family: 宋体; mso-bidi-font-family: 宋体; mso-bidi-font-size: 10.5pt" lang="EN-US">（2．<span style="FONT: 7pt 'Times New Roman'">
</span></span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">每个按键有它的行值和列值 ，行值和列值的组合就是识别这个按键的编码。矩阵的行线和列线分别通过两并行接口和<span lang="EN-US">CPU</span>通信。每个按键的状态同样需变成数字量“<span lang="EN-US">0</span>”和“<span lang="EN-US">1</span>”，开关的一端（列线）通过电阻接<span lang="EN-US">V<sub>CC</sub></span>，而接地是通过程序输出数字“<span lang="EN-US">0</span>”实现的。键盘处理程序的任务是：确定有无键按下，判断哪一个键按下，键的功能是什么；还要消除按键在闭合或断开时的抖动。两个并行口中，一个输出扫描码，使按键逐行动态接地，另一个并行口输入按键状态，由行扫描值和回馈信号共同形成键编码而识别按键，通过软件查表，查出该键的功能。<span lang="EN-US"><o:p>
</o:p>
</span></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal"><i style="mso-bidi-font-style: normal"><span style="mso-list: Ignore; font-size: 12pt; font-family: 幼圆; mso-bidi-font-family: 幼圆; mso-hansi-font-family: 宋体" lang="EN-US">5．<span style="FONT: 7pt 'Times New Roman'">
</span></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 幼圆; mso-hansi-font-family: 宋体">程序框图</span></i></b></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal"><i style="mso-bidi-font-style: normal"><span lang="EN-US" style="font-size: 12pt; font-family: 幼圆; mso-hansi-font-family: 宋体"><o:p>
<img style="BORDER-LEFT-COLOR: #000000; FILTER: ; BORDER-BOTTOM-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-RIGHT-COLOR: #000000" alt src="200541858675999.JPG" border="0" width="574" height="564"></o:p>
</span></i></b></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><o:p>
</o:p>
</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align="center"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"><st1:chsdate w:st="on"
Year="1899" Month="12" Day="30" IsLunarDate="False" IsROCDate="False">
</st1:chsdate>
<span lang="EN-US"><o:p>
</o:p>
</span></span> </p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal"><i style="mso-bidi-font-style: normal"><span style="mso-list: Ignore; font-size: 12pt; font-family: 幼圆; mso-bidi-font-family: 幼圆; mso-hansi-font-family: 宋体" lang="EN-US">6．<span style="FONT: 7pt 'Times New Roman'">
</span></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 幼圆; mso-hansi-font-family: 宋体">汇编源程序<span lang="EN-US"><o:p>
</o:p>
</span></span></i></b></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">KEYBUF<span style="mso-spacerun: yes">
</span>EQU 30H<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">
</span>ORG 00H<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">START:<span style="mso-spacerun: yes">
</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">WAIT:<span style="mso-spacerun: yes">
</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">
</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">
</span>CLR P3.4<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">
</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">
</span>ANL A,#0FH<span style="mso-spacerun: yes"> </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">
</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">
</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">
</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">
</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">
</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">
</span>XRL A,#0FH<o:p>
</o:p>
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