?? ds18b20

?? 一個(gè)針灸治療儀源代碼,包括記時(shí),顯示AD采樣程序,開發(fā)環(huán)境keil.使用的芯片PLC89C935
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    width=114>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">0<O:P> 
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    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0pt; BORDER-LEFT: medium none; WIDTH: 85.2pt; PADDING-TOP: 0pt; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-top-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" 
    width=114>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">11位<O:P> 
      </O:P></SPAN></P></TD>
    <TD 
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    width=163>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">375ms<O:P> 
      </O:P></SPAN></P></TD></TR>
  <TR>
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    width=114>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">1<O:P> 
      </O:P></SPAN></P></TD>
    <TD 
    style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0pt; BORDER-LEFT: medium none; WIDTH: 85.2pt; PADDING-TOP: 0pt; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-top-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" 
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      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">1<O:P> 
      </O:P></SPAN></P></TD>
    <TD 
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    width=114>
      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">12位<O:P> 
      </O:P></SPAN></P></TD>
    <TD 
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      <P><SPAN lang=EN-US 
      style="FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt">750ms<O:P> 
      </O:P></SPAN></P></TD></TR></TBODY></TABLE>
<P style="TEXT-INDENT: 30px">　</P>
<P style="TEXT-INDENT: 30px"><SPAN class=main1><B>表1 
DS1820溫度數(shù)字對應(yīng)關(guān)系表</B></SPAN></P>
<TABLE borderColorDark=#ffffff width="100%" borderColorLight=#000000 border=1>
  <TBODY>
  <TR class=main>
    <TD align=middle width="33%">溫度℃</TD>
    <TD align=middle width="33%">輸出的二進(jìn)制碼</TD>
    <TD align=middle width="34%">對應(yīng)的十六進(jìn)制碼</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">+125</TD>
    <TD align=middle width="33%">0000000011111010</TD>
    <TD align=middle width="34%">00FAH</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">+25</TD>
    <TD align=middle width="33%">0000000000110010</TD>
    <TD align=middle width="34%">0032H</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">+1/2</TD>
    <TD align=middle width="33%">0000000000000001</TD>
    <TD align=middle width="34%">0001H</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">0</TD>
    <TD align=middle width="33%">0000000000000000</TD>
    <TD align=middle width="34%">0000H</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">-1/2</TD>
    <TD align=middle width="33%">1111111111111111</TD>
    <TD align=middle width="34%">FFFFH</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">-25</TD>
    <TD align=middle width="33%">1111111111001110</TD>
    <TD align=middle width="34%">FFCEH</TD></TR>
  <TR class=main>
    <TD align=middle width="33%">-55</TD>
    <TD align=middle width="33%">1111111110010010</TD>
    <TD align=middle width="34%">FF92H</TD></TR></TBODY></TABLE>
<P style="TEXT-INDENT: 0px"><SPAN class=main1>2.3 64位激光ROM</SPAN></P>
<P style="TEXT-INDENT: 30px"><SPAN class=main1>64位ROM的結(jié)構(gòu)如下：<BR><IMG height=33 
hspace=23 src="D:\work\program\C51\acupunture0910\DS18B20測量溫度.files\mhtC(1).tmp" 
width=236 vspace=7 border=0><BR></SPAN>&nbsp;&nbsp;&nbsp; <SPAN 
class=main1>開始8位是產(chǎn)品類型的編號（DS1820為10H），接著是每個(gè)器件的唯一的序號，共有48位，最后8位是前56位的CRC校驗(yàn)碼，這也是多個(gè)DS1820可以采用一線進(jìn)行通信的原因。主機(jī)操作ROM的命令有五種，如表2所列<BR><BR><B>表2 
DS180的ROM命令</B></SPAN></P>
<TABLE borderColorDark=#ffffff width="100%" borderColorLight=#000000 border=1>
  <TBODY>
  <TR class=main>
    <TD align=middle width="50%">指&nbsp; 令</TD>
    <TD align=middle width="50%">說&nbsp; 明</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">讀ROM（33H）</TD>
    <TD width="50%">讀DS1820的序列號</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">匹配ROM（55H）</TD>
    <TD width="50%">繼讀完64位序列號的一個(gè)命令，用于多個(gè)DS1820時(shí)定位</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">跳過ROM（CCH）</TD>
    <TD width="50%">此命令執(zhí)行后的存儲器操作將針對在線的所有DS1820</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">搜ROM（F0H）</TD>
    <TD width="50%">識別總線上各器件的編碼，為操作各器件作好準(zhǔn)備</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">報(bào)警搜索（ECH）</TD>
    <TD width="50%">僅溫度越限的器件對此命令作出響應(yīng)</TD></TR></TBODY></TABLE>
<P style="TEXT-INDENT: 0px"><SPAN class=main1>2.4 高速暫存器</SPAN></P>
<P style="TEXT-INDENT: 30px"><SPAN class=main1>它由便箋式RAM和非易失性電擦寫 
EERAM組成，后者用于存儲TH、TL值。數(shù)據(jù)選寫入RAM，經(jīng)校驗(yàn)后再傳給EERAM。便箋式EAM點(diǎn)9個(gè)字節(jié)，包括溫度信息（第1、2字節(jié)）、TH和TL值（3、4字節(jié)）、計(jì)數(shù)寄存器（7、8字節(jié)）、CRC（第9字節(jié)）等，第5、6字節(jié)不用。暫存器的命令共6條，見表3所列。<BR><BR><B>表3 
DS1820貯控制命令</B></SPAN></P>
<TABLE borderColorDark=#ffffff width="100%" borderColorLight=#000000 border=1>
  <TBODY>
  <TR class=main>
    <TD align=middle width="50%">指&nbsp; 令</TD>
    <TD align=middle width="50%">說&nbsp; 明</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">溫度轉(zhuǎn)換（44H）</TD>
    <TD align=left width="50%">啟動(dòng)在線DS1820做溫度A/D轉(zhuǎn)換</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">讀數(shù)據(jù)（BEH）</TD>
    <TD align=left width="50%">從高速暫存器讀9bits溫度值和CRC值</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">寫數(shù)據(jù)（4EH）</TD>
    <TD align=left width="50%">將數(shù)據(jù)寫入高速暫存器的第2和第3字節(jié)和第4字節(jié)(<FONT 
      face="Times New Roman">configuration registers)</FONT>中</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">復(fù)制（48H）</TD>
    <TD align=left width="50%">將高速暫存器中第2和第3字節(jié)復(fù)制到EERAM</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">讀EERAM（B8H）</TD>
    <TD align=left width="50%">將EERAM內(nèi)容寫入高速暫存器中第2和第3字節(jié)</TD></TR>
  <TR class=main>
    <TD align=middle width="50%">讀電源供電方式（B4H）</TD>
    <TD align=left width="50%">了解DS1820的供電方式</TD></TR></TBODY></TABLE>
<P style="TEXT-INDENT: 30px"><SPAN 
class=main1>在正常測溫情況下，DS1820的測溫分辨力為0.5℃，可采用下述方法獲得高分辨率的溫度測量結(jié)果：首先用DS1820提供的讀暫存器指令（BEH）讀出以0.5℃為分辨率的溫度測量結(jié)果，然后切去測量結(jié)果中的最低有效位（LSB），得到所測實(shí)際溫度的整數(shù)部分Tz，然后現(xiàn)用BEH指令取計(jì)數(shù)器1的計(jì)數(shù)剩余值Cs和每度計(jì)數(shù)值CD。考慮到DS1820測量溫度的整數(shù)部分以0.25℃、0.75℃為進(jìn)位界限的關(guān)系，實(shí)際溫度Ts可用下式計(jì)算：</SPAN></P>
<P style="TEXT-INDENT: 30px"><SPAN 
class=main1>Ts=（Tz-0.25℃）+(CD-Cs)/CD</SPAN></P></BODY></HTML>
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