Patent ID: 7051142

Claim:
An electronic device in which a card-shaped device having a connector section is usable, the connector section being provided with connector pins, the electronic device including a card interface to be connected to the card-shaped device via the connector section of the card-shaped device, the card interface comprising: a ground pin assigned as a ground signal terminal for supplying a ground signal to the card-shaped device; a power pin assigned as a power signal terminal for supplying a power signal to the card-shaped device; a clock pin assigned as a clock signal terminal for supplying a clock signal to the card-shaped device; a command pin assigned as a terminal for: (i) transmitting a specific command to the card-shaped device and requesting an operation mode information designating an operation mode thereof; and (ii) receiving a response including the operation mode information requested by the specific command, the command pin being assigned as the terminal when the card interface is connected to the card-shaped device; a first data pin assigned only as a terminal for a bidirectional data transfer; and a second data pin assigned as a terminal for a bidirectional data transfer, when the operation mode information included in a response to the specific command designates a first operation mode corresponding to a memory card being used as the card-shaped device, and assigned as a terminal for transferring a predetermined signal other than data, when the operation mode information designates a second operation mode corresponding to an input/output card being used as the card-shaped device.