Application processor for adjusting clolck signal using hardware power management unit and devices including same

Application processor on the basis of the CPU and, IP s, hardware power management unit and the control signal based on the first idle signal output from the CPU determines whether or not the system idle, and outputs the control signal, the CPU and comprises a clock signal supply control circuit for changing the clock signal to be supplied to the IP as the oscillation clock signal, and the frequency of the clock signal coming illustration is lower than each of the frequencies of the clock signal.