Clock switch device and microcontroller for selecting one of a plurality of clocks based on signal levels
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United States of America Patent
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May 30, 2006
Grant Date -
Mar 6, 2003
app pub date -
Aug 29, 2002
filing date -
Aug 30, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The clock switch device of the present invention includes: a clock detector for receiving a plurality of clocks and clock selection data designating a clock to be selected, detecting whether or not the clock designated by the clock selection data among the plurality of clocks changes in signal level, and outputting the result as a detection signal; a control register for holding and outputting the clock selection data when the detection signal indicates that the clock designated by the clock selection data changes in signal level; and a selector for receiving the plurality of clocks and selecting a clock corresponding to the output of the control register among the plurality of clocks.
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