| 摘要 |
In a clock frequency controlling method and method, a plurality of clock output selectors are provided to respectively provide output clock signals based on input clock signals with different frequencies at respective selector inputs. One of the plurality of clock output selectors is controlled in response to an operating clock request to provide a selected clock signal among the output clock signals in accordance with an indication of the request. When the first indication of the request is changed to a second indication, the selected clock signal is deactivated in synchronism with a corresponding one of the input clock signals. After the selected clock signal is deactivated, a second selected clock signal is activated in response to the second indication of the request in synchronism with a corresponding one of the input clock signals.
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