Patent ID: 7757958

Claim:
A card-shaped memory device comprising: a power supply terminal to which power is to be supplied from a host device; an antenna terminal connected to a non-contact communication antenna provided at the host device, and configured to receive a signal from the antenna; a first control circuit having a wireless communication function and an IC card function; a power generating circuit included in the first control circuit, and configured to generate power based on the signal from the antenna; a switching circuit included in the first control circuit, and configured to switch supplying of the power from the power supply terminal and supplying of the power generated from the power generating circuit; a memory chip; and a second control circuit connectable to the host device and coupled to the memory chip and the switching circuit, and configured to receive a command, issued from the host device, which controls switching of the supplying of the power from the power supply terminal and the supplying of the power generated from the power generating circuit.