Interface circuit and an electronic device including the same

An electronic device comprising:

• a first audio terminal that is to be connected to a second audio terminal of another device;
• an audio signal providing module;
• and
• an interface circuit that includes
• a detecting module electrically connected to said first audio terminal, and capable of detecting whether said first audio terminal is electrically connected to the second audio terminal,
• a control module including a detecting pin that is electrically connected to said detecting module, a signal receiving pin, and a signal transmitting pin, and
• a switch module operable to establish electrical connection between said signal receiving pin and the first audio terminal, between said signal transmitting pin and said first audio terminal, and between said audio signal providing module and said first audio terminal;
• wherein when it is detected by said detecting module that said first audio terminal is electrically connected to the second audio terminal, said control module controls said switch module to establish electrical connection between said signal receiving pin and said first audio terminal, said control module further controls said switch module to establish electrical connection between said signal transmitting pin and said first audio terminal so as to proceed with a program update upon determining that updating information from the second audio terminal is received thereby through said signal receiving pin, and said control module further controls said switch module to establish electrical connection between said audio signal providing module and said first audio terminal such that an audio signal from said audio signal providing module is transmitted to the second audio terminal through said first audio terminal upon determining that no updating information is received thereby through said signal receiving pin.