Patent ID: 7889055

Claim:
An IC tag, comprising: a first storage circuit including a plurality of addressable memory cells; a memory control circuit receiving a command and an address by use of a radio signal to control the first storage circuit based on the command and the address; an address storage circuit storing the received address; a second storage circuit containing relations of specific commands not requiring address data of memory cells to respective reference keys; and a comparator circuit coupled to the address storage circuit and the second storage circuit, the comparator circuit comparing a received authorization key included in the received address with the reference keys, wherein when the received command is a command requiring address data, the memory control circuit performs a memory control in response to the received command and the address stored in the address storage circuit, wherein when the received command is a specific command not requiring address data, the comparator circuit compares the respective reference key related to the received specific command with the received authentication key included in the address received with the specific command stored in the address storage circuit and if the keys match the memory control circuit performs a memory control in response to the received command.