Patent ID: 8549337

Claim:
A memory card control device comprising: an insertion unit to which a memory card is inserted; a memory card controller configured to control writing and reading of data to/from the memory card inserted in the insertion unit; an interface controller configured to send and receive the data written or read to/from the memory card to/from a host computer via a signal line; a clock supplier configured to supply a clock signal to the memory card controller and the interface controller; a memory card detector configured to detect presence or absence of the memory card inserted in the insertion unit; a low power consumption mode switching unit configured to switch the memory card controller and the interface controller to a low power consumption mode in response to the absence of the memory card detected by the memory card detector, wherein the interface controller is connected to the host computer through a USB interface, and wherein the low power consumption mode switching unit is configured to switch the interface controller to the low power consumption mode by electrically disconnecting the interface controller from the host computer by (i) in a case in which the USB interface is operating in a full speed mode, electrically disabling a pull-up resistor between a power supply and the signal line over which the interface controller communicates with the host computer and (ii) in a case in which the USB interface is operating in a high speed mode, electrically disabling a termination resistor on the signal line over which the interface controller communicates with the host computer.