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      lang=EN-US><o:p></o:p></SPAN></SPAN></P></TD></TR>
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      align=center><SPAN lang=EN-US 
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    style="PADDING-RIGHT: 0cm; PADDING-LEFT: 0cm; BORDER-LEFT-COLOR: #ece9d8; BORDER-BOTTOM-COLOR: #ece9d8; PADDING-BOTTOM: 0cm; BORDER-TOP-COLOR: #ece9d8; PADDING-TOP: 0cm; HEIGHT: 262.5pt; BACKGROUND-COLOR: transparent; BORDER-RIGHT-COLOR: #ece9d8" 
    colSpan=2>
      <P class=MsoNormal 
      style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 20pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" 
      align=left><SPAN 
      style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">四、操作模式：<SPAN 
      lang=EN-US> <BR></SPAN>　　地址输入有双重功能<SPAN lang=EN-US>,</SPAN>根据地址中的<SPAN 
      lang=EN-US>A6,A7</SPAN>的电平状态决定<SPAN lang=EN-US>A0</SPAN>～<SPAN 
      lang=EN-US>A7</SPAN>的功能。如果<SPAN lang=EN-US>A6,A7</SPAN>有一个是低电平<SPAN 
      lang=EN-US>,A0</SPAN>～<SPAN lang=EN-US>A7</SPAN>输入全解释为地址位<SPAN 
      lang=EN-US>,</SPAN>作为起始地址用。地址位仅作为输入端<SPAN 
      lang=EN-US>,</SPAN>在操作过程中不能输出内部地址信息。根据 、 或 的下降沿信号<SPAN 
      lang=EN-US>,</SPAN>地址输入被锁定。如果<SPAN lang=EN-US>A6,A7</SPAN>同为高电平时<SPAN 
      lang=EN-US>,</SPAN>它们即为模式位。<SPAN lang=EN-US> <BR></SPAN>使用操作模式有两点要注意<SPAN 
      lang=EN-US>: <BR></SPAN>　　<SPAN lang=EN-US>(</SPAN>一<SPAN 
      lang=EN-US>)</SPAN>所有初始操作都是从<SPAN lang=EN-US>0</SPAN>地址开始<SPAN 
      lang=EN-US>,0</SPAN>地址是<SPAN lang=EN-US>1420</SPAN>存储空间的起始端<SPAN 
      lang=EN-US>,</SPAN>以后的操作可根据模式的不同<SPAN 
      lang=EN-US>,</SPAN>而从不同的地址开始工作。当电路中录放音转换或进入省电状态时，地址计数器复位为<SPAN 
      lang=EN-US>0</SPAN>。<SPAN lang=EN-US><BR></SPAN>　　<SPAN 
      lang=EN-US>(</SPAN>二<SPAN lang=EN-US>)</SPAN>当 、 或 变为低电平<SPAN 
      lang=EN-US>,</SPAN>同时<SPAN lang=EN-US>A6,A7</SPAN>为高电平时<SPAN 
      lang=EN-US>,</SPAN>执行对应操作模式。这种操作模式一直执行到下一个低电平控制输入信号出现为止<SPAN 
      lang=EN-US>,</SPAN>这一刻现行的地址<SPAN lang=EN-US>/</SPAN>模式信号被取样并执行。<SPAN 
      lang=EN-US><BR></SPAN>操作模式可以与微控制器一起使用<SPAN 
      lang=EN-US>,</SPAN>也可用硬件连线得到所需系统操作。<SPAN 
      lang=EN-US><BR>A0---</SPAN>信息检索<SPAN lang=EN-US>( </SPAN>或<SPAN 
      lang=EN-US> only)<BR></SPAN>不知道每个信息的实际地址<SPAN 
      lang=EN-US>,A0</SPAN>可使操作者快速检索每条信息<SPAN lang=EN-US>,A0</SPAN>每输入一个低脉冲<SPAN 
      lang=EN-US>,</SPAN>可使得内部地址计数器跳到下一个信息。这种模式仅用于放音<SPAN 
      lang=EN-US>,</SPAN>通常与<SPAN lang=EN-US>A4</SPAN>操作同时应用。<SPAN 
      lang=EN-US><BR>A1--- </SPAN>删除 标志<SPAN lang=EN-US>( 
      only)</SPAN>可使录入的分段信息成为连续的信息<SPAN lang=EN-US>,</SPAN>用<SPAN 
      lang=EN-US>A1</SPAN>可删除掉每段中间信息后的 标志<SPAN lang=EN-US>,</SPAN>仅在所有信息后留一个 
      标志。当这个操作模式完成时<SPAN lang=EN-US>,</SPAN>录入的所有信息就作为一个连续的信息放出。<SPAN 
      lang=EN-US><BR>A3--- </SPAN>循环重放信息<SPAN lang=EN-US>( </SPAN>或<SPAN 
      lang=EN-US> only)</SPAN>可使存于存储空间始端的信息自动地连续重放。一条信息可以完全占满存储空间<SPAN 
      lang=EN-US>,</SPAN>那么循环就可以从头至尾进行工作<SPAN lang=EN-US>,</SPAN>并由始至终反复重放。<SPAN 
      lang=EN-US> <o:p></o:p></SPAN></SPAN></P></TD></TR>
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    style="PADDING-RIGHT: 0cm; PADDING-LEFT: 0cm; BORDER-LEFT-COLOR: #ece9d8; BORDER-BOTTOM-COLOR: #ece9d8; PADDING-BOTTOM: 0cm; WIDTH: 34%; BORDER-TOP-COLOR: #ece9d8; PADDING-TOP: 0cm; BACKGROUND-COLOR: transparent; BORDER-RIGHT-COLOR: #ece9d8" 
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      <P class=MsoNormal 
      style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 20pt; TEXT-ALIGN: left; mso-pagination: widow-orphan" 
      align=left><SPAN lang=EN-US 
      style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">A4--- 
      </SPAN><SPAN 
      style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">连续寻址：在正常操作中<SPAN 
      lang=EN-US>, </SPAN>当一个信息放出<SPAN lang=EN-US>, </SPAN>遇到一个 标志时<SPAN 
      lang=EN-US>,</SPAN>地址计数器会复位，<SPAN lang=EN-US>A4</SPAN>可防止地址计数器复位<SPAN 
      lang=EN-US>,</SPAN>使得信息连续不断地放出。<SPAN lang=EN-US><BR>A2</SPAN>、<SPAN 
      lang=EN-US>A5--- </SPAN>未用。<SPAN 
    lang=EN-US><o:p></o:p></SPAN></SPAN></P></TD>
    <TD 
    style="PADDING-RIGHT: 0cm; PADDING-LEFT: 0cm; BORDER-LEFT-COLOR: #ece9d8; BORDER-BOTTOM-COLOR: #ece9d8; PADDING-BOTTOM: 0cm; WIDTH: 66%; BORDER-TOP-COLOR: #ece9d8; PADDING-TOP: 0cm; BACKGROUND-COLOR: transparent; BORDER-RIGHT-COLOR: #ece9d8" 
    width="66%">
      <P class=MsoNormal 
      style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; mso-pagination: widow-orphan" 
      align=center><SPAN lang=EN-US 
      style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><v:shape 
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      align=left><SPAN 
      style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">五、典型线路图：<SPAN 
      lang=EN-US><o:p></o:p></SPAN></SPAN></P></TD></TR>
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    <TD 
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
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    <TD class=article_more_left_title>系统分类:</TD>
    <TD class=article_more_left_value><A 
      href="http://www.ednchina.com/blog/10052/category.aspx">消费电子 </A></TD></TR>
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    <TD class=article_more_left_title>标签:</TD>
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    <TD class=article_more_left_title>来源:</TD>
    <TD class=article_more_left_value>原创 </TD></TR></TBODY></TABLE></DIV>
<DIV class=article_more_right><A 
href="http://www.ednchina.com/blog/ic668/14243/message.aspx#feedback">发表评论</A> 
阅读全文(561) | 回复(0) </DIV></DIV></DIV></DIV>
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<DIV class=article_title><A 
href="http://www.ednchina.com/blog/ic668/10233/message.aspx">语音芯片 </A></DIV>
<DIV class=article_info>发表于 2006-12-16 16:11:15 </DIV>
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    style="PADDING-RIGHT: 0cm; PADDING-LEFT: 0cm; BORDER-LEFT-COLOR: #ece9d8; BORDER-BOTTOM-COLOR: #ece9d8; PADDING-BOTTOM: 0cm; BORDER-TOP-COLOR: #ece9d8; PADDING-TOP: 0cm; HEIGHT: 56.25pt; BACKGROUND-COLOR: transparent; BORDER-RIGHT-COLOR: #ece9d8" 
    vAlign=top>
      <P class=MsoNormal 
      style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 20pt; TEXT-ALIGN: left; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-pagination: widow-orphan" 
      align=left><SPAN 
      style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">美国<SPAN 
      lang=EN-US>ISD</SPAN>公司的<SPAN lang=EN-US>2500</SPAN>芯片，按录放时间<SPAN 
      lang=EN-US>60</SPAN>秒、<SPAN lang=EN-US>75</SPAN>秒、<SPAN 
      lang=EN-US>90</SPAN>秒和<SPAN lang=EN-US>120</SPAN>秒分成<SPAN 
      lang=EN-US>ISD2560</SPAN>、<SPAN lang=EN-US>2575</SPAN>、<SPAN 
      lang=EN-US>2590</SPAN>和<SPAN lang=EN-US>25120</SPAN>四个品种。<SPAN 
      lang=EN-US><BR></SPAN>　　<SPAN lang=EN-US>ISD2500</SPAN>系列和<SPAN 
      lang=EN-US>1400</SPAN>系列语音电路一样，具有抗断电、音质好，使用方便等优点。它的最大特点在于片内<SPAN 
      lang=EN-US>E2PROM</SPAN>容量为<SPAN lang=EN-US>480K(1400</SPAN>系列为<SPAN 
      lang=EN-US>128K)</SPAN>，所以录放时间长；有<SPAN lang=EN-US>10</SPAN>个地址输入端<SPAN 
      lang=EN-US>(1400</SPAN>系列仅为<SPAN lang=EN-US>8</SPAN>个<SPAN 
      lang=EN-US>)</SPAN>，寻址能力可达<SPAN lang=EN-US>1024</SPAN>位；最多能分<SPAN 
      lang=EN-US>600</SPAN>段；设有<SPAN 
      lang=EN-US>OVF</SPAN>（溢出）端，便于多个器件级联。如图：<SPAN 
      lang=EN-US><o:p></o:p></SPAN></SPAN></P>
      <DIV align=center>
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      style="WIDTH: 23%; mso-cellspacing: 0cm; mso-padding-alt: 0cm 0cm 0cm
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