| 摘要 |
Power consumption in a DLL circuit having a DCC circuit is reduced. Specifically, a semiconductor circuit includes a change-in-duty detection circuit, activation and deactivation of which is controlled based upon a control signal (DCCEN), for comparing duty of a clock signal that has been generated based upon an input clock signal and a preset duty and outputting result of the comparison; and a duty determination circuit for outputting the control signal (DCCEN) for deactivating the change-in-duty detection circuit when the output of the change-in-duty detection circuit indicates that duty of the generated clock signal is in the vicinity of a target value, which is a preset duty, and outputting the control signal (DCCEN) for activating the change-in-duty detection circuit when the duty of the generated clock signal is not in the vicinity of the target value.
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