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    <title>i.MX ProcessorsのトピックiMX 51 using external clock (COSC_EN)</title>
    <link>https://community.nxp.com/t5/i-MX-Processors/iMX-51-using-external-clock-COSC-EN/m-p/150602#M1023</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hello,&lt;/P&gt;&lt;P&gt;We're using the iMX51 processor with an external 24MHz oscillator and the datasheet says the COSC_EN bit needs to be cleared to put the on-chip oscillator in bypass which allows EXTAL to be externally driven. We've&amp;nbsp;been running multiple boards for months without doing this without an issue. My question does anyone know&amp;nbsp;what&amp;nbsp;the risk is (if any) in not doing this if using an external clock? Does anyone else&amp;nbsp;drive this part using an external clock (ie; any know issues)?&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Thu, 10 Mar 2011 16:24:35 GMT</pubDate>
    <dc:creator>josephkulina</dc:creator>
    <dc:date>2011-03-10T16:24:35Z</dc:date>
    <item>
      <title>iMX 51 using external clock (COSC_EN)</title>
      <link>https://community.nxp.com/t5/i-MX-Processors/iMX-51-using-external-clock-COSC-EN/m-p/150602#M1023</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hello,&lt;/P&gt;&lt;P&gt;We're using the iMX51 processor with an external 24MHz oscillator and the datasheet says the COSC_EN bit needs to be cleared to put the on-chip oscillator in bypass which allows EXTAL to be externally driven. We've&amp;nbsp;been running multiple boards for months without doing this without an issue. My question does anyone know&amp;nbsp;what&amp;nbsp;the risk is (if any) in not doing this if using an external clock? Does anyone else&amp;nbsp;drive this part using an external clock (ie; any know issues)?&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 10 Mar 2011 16:24:35 GMT</pubDate>
      <guid>https://community.nxp.com/t5/i-MX-Processors/iMX-51-using-external-clock-COSC-EN/m-p/150602#M1023</guid>
      <dc:creator>josephkulina</dc:creator>
      <dc:date>2011-03-10T16:24:35Z</dc:date>
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