Disclosed herein is an apparatus that includes first and second shift register circuits coupled in series, the first and second shift register circuits being configured to perform a shift operation of a trigger signal in synchronization with a clock signal, and a clock control circuit configured to set a frequency of the clock signal to a first frequency when the trigger signal is in the first shift register circuit and set a frequency of the clock signal to a second frequency different from the first frequency when the trigger signal is in the second shift register circuit.