Patent ID: 7356359

Claim:
A method for determining connection of an external device to a mobile communication terminal, the method comprising: detecting connection of an external device to a mobile communication terminal based on a signal generated by a first operation module of the mobile communication terminal; activating a connection interrupt routine, in response to the signal generated by the first operation module; controlling an active status of a second operation module by way of the first operation module to switch system operations from a first clock speed to a second clock speed; and establishing a signal transfer path between the mobile communication terminal and the external device; wherein the connection interrupt routine comprises: switching the first operation module into the operating mode; applying an activation signal to the second operation module by the first operation module to switch the second operation module into an operating mode; initializing a first serial communication port of the first operation module; initializing a second serial communication port of the second operation module; notifying the second operation module that the external device is connected through the first and second serial communication ports; and establishing the signal transfer path for the connected external device by the second operation module after receiving the notification.