Crystal oscillator clock circuit
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United States of America Patent
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Dec 4, 2012
Grant Date -
Oct 27, 2011
app pub date -
Mar 25, 2009
filing date -
Apr 4, 2008
priority date (Note) -
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Abstract
A crystal oscillator clock circuit which facilitates switching its output between an internally generated clock signal and an externally generated clock signal. A feedback loop detects the presence of an externally generated clock signal applied to an output pin of a crystal oscillator circuit and powers down the internally generated clock signal. As a result, the crystal oscillator clock circuit simply passes the externally generated clock signal as its output signal.
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