Mobile communication terminal having external device sensing and the method

The present invention relates to a mobile communication terminal and a method having the external device detection. The invention process for switching a mobile station modem to an operation mode by operating a connection interrupt routine, and; The process of the mobile station modem switches to the operation mode switching a PDA module to an operation mode and a serial communication with the PDA module; The process of notification via the serial communication, to the PDA module that the connection is established with the external apparatus; The process of the PDA module receives the notification setting a predetermined transmission path for an external apparatus; It can be achieved by yirueojim the connection interrupt to the process of termination in the interrupt vector table. The invention process for switching a mobile station modem to drive the separation interrupt routine in the operation mode, and; The process of the mobile station modem switches to the active mode and switch the module to the PDA operating mode, a serial communication with the PDA module; The process of notification via the serial communication, to the PDA module that the connection has been removed with the external apparatus; The process of the PDA module receives the notification restore the predetermined transmission path is set to the external device to the previous path and; The process of switching the mobile station modem in the sleep mode, and; It can be achieved by yirueojim the separation interrupt to the process of termination in the interrupt vector table.