Patent ID: 7162561

Claim:
A card-shaped device to be used by an electronic device having a card interface, comprising: a connector having connector pins that include data pins, a command pin, and a power signal pin, the connector being connectable to the electronic device via the card interface; a register file pre-storing operation mode information of the card-shaped device, the operation mode information indicating one of first and second operation modes; a transmitter configured to transmit the operation mode information stored in the register file to the electronic device via one of the connector pins, when a first command that requests reading of the operation mode information is received from the electronic device via the command pin; and a data transfer unit configured to execute data transfer between the card-shaped device and the electronic device, the data transfer unit transferring data using the data pins to which signal assignment was performed by the electronic device according to the operation mode information, wherein: the data transfer unit uses all of the data pins for data transfer in the first operation mode; the data transfer unit uses one of the data pins for data transfer in the second operation mode; the register file stores an operation voltage information indicating an operation voltage of the card-shaped device; and the transmitter transmits the operation voltage information stored in the register file to the electronic device via the command pin, when a second command that requests reading of the operation voltage information is received from the electronic device via the command pin.