Clock generating device and semiconductor device including the same

Embodiment of the invention relates to a clock generating apparatus and a semiconductor device including the same, a technique that enables an internal clock to tune to the desired frequency. The present invention is activated when the tuning corresponding to the signal to the oscillator for adjusting the frequency of the internal clock to tune the oscillation signal, the count in counter and the counting signal for counting an internal clock output a count signal in response to the enable signal from the enable signal and, by comparing the test count signals including a count number of the internal clock to the target comprises comparing section for outputting a tuned signal.