Operations shown in FIG. 6 may be performed by an electronic device (e.g., the electronic device 100 of FIG. 1 or FIG. 2). At least some of the operations may be performed by a processor (e.g., the processor 110 of FIG. 1 or 2) and stored in a memory in the form of instructions. In the following embodiments, the external device 200 may be referred to as the external device 200 (e.g., the external device 200 of FIG. 3) connected to a first input/output interface (e.g., the first input/output interface 140 of FIG. 2). The external device 200 may also be referred to as a pogo USB device.

When performing operations according to the USB specification, a large amount of power consumption may occur in the electronic device. In the following embodiments, when the electronic device does not need to use a large amount of power while connecting to the external device, the electronic device may enter the power saving mode.

To describe the following operations, it is assumed that the electronic device recognizes the external device 200 and connects to the external device 200. For example, the matters described as the operations of the identification circuit 130 and the USB controller 111 may be performed in a program (e.g., a circuit driver) included in the processor or the memory.

In operation 601, the electronic device (e.g., the processor or the USB controller 111) may enter the power saving mode. The electronic device may monitor data communication and determine whether to enter the power saving mode.