Integrated circuit device including wake-up control circuit and electronic device including the same

An integrated circuit device comprising:

• a central processing unit (CPU) configured to operate in one of a plurality of modes;
• and
• a wake-up control circuit configured to control the CPU, the wake-up control circuit comprising:
• a clock generator configured to generate an internal clock signal,
• a multiplexer configured to select a signal from among an external signal and the internal clock signal and to provide the CPU with the selected signal as an operating clock signal, and
• a controller configured to control the CPU and the clock generator based on the external signal, count edges of the external signal and generate a clock enable signal to activate the clock generator when a count value of the controller reaches a first reference value, and output a wake-up signal to the CPU when the count value of the controller reaches a second reference value greater than the first reference value such that an operation of the CPU changes from a first mode to a second mode the plurality of modes according to the wake-up signal,
• wherein the clock generator is configured to generate the internal clock signal based on the clock enable signal and output the internal clock signal to the multiplexer.