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<title>用8051控制报警产生实例</title>
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<td align="middle"><font style="FONT-SIZE: 11pt" color="#000000">用8051控制报警产生实例</font></td>
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<p><b style="mso-bidi-font-weight: normal"><span style="mso-list: Ignore; mso-fareast-font-family: Times New Roman" lang="EN-US"><font face="Times New Roman">1</font>．<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt"><font size="3">
</font></span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实验任务</span><span lang="EN-US"><o:p>
</o:p>
</span></b></p>
<p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">用</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">P1.0</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">输出</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">1KHz</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">和</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">500Hz</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">的音频信号驱动扬声器，作报警信号，要求</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">1KHz</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">信号响</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">100ms</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">，</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">500Hz</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">信号响</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">200ms,</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">交替进行，</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">P1.7</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">接一开关进行控制，当开关合上响报警信号，当开关断开告警信号停止，编出程序。</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal"><span style="mso-list: Ignore; font-family: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: 宋体" 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">电路原理图</span></b></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt">
<img style="BORDER-LEFT-COLOR: #000000; FILTER: ; BORDER-BOTTOM-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-RIGHT-COLOR: #000000" alt src="200512859965000.JPG" border="0" width="552" height="397"></span></b></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt"> </p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">“单片机系统”区域中的</span><span lang="EN-US"><font face="Times New Roman">P1.0</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端口用导线连接到“音频放大模块”区域中的</span><span lang="EN-US"><font face="Times New Roman">SPK
IN</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端口上；</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 5.25pt; mso-char-indent-count: .5"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在“音频放大模块”区域中的</span><span lang="EN-US"><font face="Times New Roman">SPK
OUT</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端口上接上一个</span><span lang="EN-US"><font face="Times New Roman">8</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">欧的或者是</span><span lang="EN-US"><font face="Times New Roman">16</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">欧的喇叭；</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 5.15pt; tab-stops: 27.0pt; mso-para-margin-left: .49gd"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-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">P1.7/RD</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端口用导线连接到“四路拨动开关”区域中的</span><span lang="EN-US"><font face="Times New Roman">K1</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端口上；</span></p>
<span lang="EN-US"><o:p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal"><span style="mso-list: Ignore; font-family: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: 宋体" lang="EN-US">3．<span style="FONT: 7pt 'Times New Roman'">
</span></span>程序框图</b></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><b style="mso-bidi-font-weight: normal">
<img style="BORDER-LEFT-COLOR: #000000; FILTER: ; BORDER-BOTTOM-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-RIGHT-COLOR: #000000" alt src="200512860041000.JPG" border="0" width="524" height="442"></b></p>
<b style="mso-bidi-font-weight: normal">
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><span style="mso-list: Ignore; font-family: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: 宋体" lang="EN-US">4．<span style="FONT: 7pt 'Times New Roman'">
</span></span>参考源程序</p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"> </p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 12pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">FLAG<span style="mso-tab-count: 1"> </span><span style="mso-tab-count: 2"> </span>BIT
00H<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-tab-count: 2">
</span>ORG 00H<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 12pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">START:<span style="mso-tab-count: 2">
</span>JB P1.7,START<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-tab-count: 2">
</span>JNB FLAG,NEXT<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-tab-count: 2">
</span>MOV R2,#200<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; LINE-HEIGHT: 12pt; mso-char-indent-count: 2.0; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman">DV:<span style="mso-tab-count: 2">
</span><span style="mso-tab-count: 1">
</span>CPL P1.0<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-tab-count: 2">
</span>LCALL DELY500<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-tab-count: 2">
</span>LCALL DELY500<o:p>
</o:p>
</font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly"><span lang="EN-US" style="FONT-SIZE: 9pt"><font face="Times New Roman"><span style="mso-tab-count: 2">
</span>DJNZ R2,DV<o:p>
</o:p>
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