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📄 s320f2812的延时程序(完整).htm

📁 对于2812的一个延时程序 可以对初学者有很大的帮助
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    height=50>S320F2812的延时程序(完整)</TD></TR>
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      colSpan=2>作者:佚名&nbsp;&nbsp;&nbsp;&nbsp;文章来源:本站原创&nbsp;&nbsp;&nbsp;&nbsp;点击数:
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      &nbsp;&nbsp;&nbsp;&nbsp;更新时间:2005-11-29</TD></TR>
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      <P>.def&nbsp;_DSP28x_usDelay 
      <BR><BR>;==================================================== 
      <BR>;Delay&nbsp;Function&nbsp; 
      <BR>;The&nbsp;C&nbsp;assembly&nbsp;call&nbsp;will&nbsp;look&nbsp;as&nbsp;follows:&nbsp; 
      <BR>; 
      <BR>;&nbsp;&nbsp;extern&nbsp;void&nbsp;Delay(long&nbsp;time);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
      <BR><BR>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MOV&nbsp;&nbsp;&nbsp;AL,#LowLoopCount 
      <BR>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MOV&nbsp;&nbsp;&nbsp;AH,#HighLoopCount 
      <BR>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LCR&nbsp;&nbsp;&nbsp;_Delay 
      <BR>; 
      <BR>;Or&nbsp;as&nbsp;follows&nbsp;(if&nbsp;count&nbsp;is&nbsp;less&nbsp;then&nbsp;16-bits): 
      <BR>; 
      <BR>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MOV&nbsp;&nbsp;&nbsp;ACC,#LoopCount 
      <BR>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LCR&nbsp;&nbsp;&nbsp;_Delay 
      <BR><BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.global&nbsp;&nbsp;__DSP28x_usDelay 
      <BR>_DSP28x_usDelay: 
      <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SUB&nbsp;&nbsp;&nbsp;&nbsp;ACC,#1 
      <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NOP 
      <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NOP 
      <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;_DSP28x_usDelay,GEQ&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;Loop&nbsp;if&nbsp;ACC&nbsp;&gt;=&nbsp;0 
      <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LRETR&nbsp; 
      <BR><BR>;There&nbsp;is&nbsp;a&nbsp;9/10&nbsp;cycle&nbsp;overhead&nbsp;and&nbsp;each&nbsp;loop 
      <BR>;takes&nbsp;five&nbsp;cycles.&nbsp;The&nbsp;LoopCount&nbsp;is&nbsp;given&nbsp;by 
      <BR>;the&nbsp;following&nbsp;formula: 
      <BR><BR>;&nbsp;&nbsp;DELAY_CPU_CYLES&nbsp;=&nbsp;9&nbsp;+&nbsp;5*LoopCount 
      <BR><BR>;&nbsp;LoopCount&nbsp;=&nbsp;(DELAY_CPU_CYCLES&nbsp;-&nbsp;9)&nbsp;/&nbsp;5 
      <BR><BR>;================================================== <BR>-- <BR>
      <HR>

      <P></P>
      <P>RE:我是这么调用的(C语言) 
      <BR>extern&nbsp;void&nbsp;DSP28x_usDelay(long&nbsp;time); <BR>在需要延时的地方加入 
      <BR>DSP28x_usDelay(0x100000);//根据延迟时间写入参数 <BR></P></TD></TR>
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