Patent ID: 7929910

Claim:
A portable electronic apparatus, comprising: an application module for performing a main function of the portable electronic apparatus and comprising: a processing unit; a user interface circuit coupled to the processing unit for providing a user interface through which a user can manipulate the portable electronic apparatus; an application circuit coupled to the processing unit wherein the processing unit controls the application circuit to perform the main function of the portable electronic apparatus; and a memory device coupled to the processing unit for storing specific information; an active near field communication (NFC) device coupled to the application module for communicating with an NFC device outside the portable electronic apparatus as both a RFID reader and a RFID tag and comprising: a first RF interface for receiving and transmitting RF signals; a first controller coupled to the RF interface and the processing unit for processing the RF signals; and a first storage unit coupled to the controller for storing data, wherein the data comprising the specific information transmitted from the memory device by the processing unit; a passive NFC device for communicating with an NFC device outside the portable electronic apparatus as a RFID tag and comprising: a second RF interface for receiving and transmitting RF signals; a second controller coupled to the RF interface and the processing unit for processing the RF signals; and a second storage unit for storing data the same as stored in the first storage; a power supply unit coupled to the application module and the active NFC device for powering the application module and the active NFC device, wherein the specific information is further stored in the second storage unit for being used by the passive NFC device to communicate with another NFC device or public transport when the active NFC device is not powered by the power supply unit; and a voltage detector coupled to the power supply unit and the passive NFC device for disabling the passive NFC device when the voltage of the power supply unit is not less than a threshold value.