Semiconductor integrated circuit, memory card having the semiconductor integrated circuit and method of using the memory card

Semiconductor integrated circuit comprising:

• a first interface to output predetermined encoded data when the predetermined encoded data is input;
• a second interface to output encoded key data when the encoded key data is input;
• a first encoder/decoder circuit being coupled to the first interface that decode the predetermined encoded data output from the first interface;
• a second encoder/decoder circuit being coupled to the second interface that decode encoded key data output from the wireless interface and output decoded key data;
• and
• a third encoder/decoder circuit being coupled to the first encoder/decoder circuit, second encoder/decoder circuit and CPU that encode predetermined data by use of the decoded key data or that decode the predetermined data encoded by use of the decoded key data.

A method of using a memory card comprising:

• outputting a contact mode detecting signal to a switching circuit when a power supply voltage is supplied to the memory card from a contact type reader/writer via a contact terminal;
• outputting a wireless mode detecting signal to the switching circuit when a power supply voltage is supplied to the memory card from a wireless type reader/writer via a wireless antenna terminal;
• encoding ID data held in a memory in the case of the contact mode detecting signal, and transmitting the encoded ID data to the contact type reader/writer via the contact terminal;
• decoding the received encoded ID data, judging whether or not the decoded ID data is registered ID data, and performing a predetermined operation by the contact type reader/writer when the decoded ID is the registered ID;
• encoding the ID data held in the memory in the case of a wireless mode detecting signal, and transmitting the encoded ID data to the wireless type reader/writer via the wireless antenna terminal;
• and
• decoding the received encoded ID data, judging whether or not the decoded ID data is registered ID data and performing a predetermined operation by the wireless type reader/writer when the encoded ID is the registered ID.

A method of using a memory card comprising:

• outputting a high-level contact mode detecting signal to a switching circuit when a power supply voltage is supplied to the memory card from a contact reader/writer via a contact terminal;
• outputting a low-level contact mode detecting signal to a switching circuit when a power supply voltage is not supplied to the memory card from a contact reader/writer via a contact terminal;
• outputting a high-level wireless mode detecting signal to the switching circuit when a power supply voltage is supplied to the memory card from a wireless type reader/writer via a wireless antenna terminal;
• outputting a low-level wireless mode detecting signal to the switching circuit when a power supply voltage is not supplied to the memory card from a wireless type reader/writer via a wireless antenna terminal;
• encoding ID data held in a memory in the case of the high-level contact mode detecting signal and a low-level wireless mode detecting signal, and transmitting the encoded ID data to the contact type reader/writer via the contact terminal;
• decoding the received encoded the ID data, judging whether or not the decoded ID data is the registered ID data and performing a predetermined operation by the contact type reader/writer;
• when the encoded ID data is the registered ID data;
• encoding the ID data held in the memory in the case of a low-level contact mode detecting signal and the high-level wireless mode detecting signal, and transmitting the encoded the ID data to the wireless type reader/writer via the wireless antenna terminal;
• and
• decoding received the encoded ID data, judging whether or not the decoded ID data is the registered ID data and performing a predetermined operation by the wireless type reader/writer when the encoded ID data is registered ID data.

A method of using a memory card comprising:

• decoding encoded key data received via a wireless type reader/writer;
• encoding ID data held in a memory by use of the decoded key data, and transmitting the encoded ID data to a contact type reader/writer;
• decoding the ID data by the contact type reader/writer;
• transmitting certification data, obtained by further encoding certification data encoded by key data, to the memory card by the contact type reader/writer in the case where the decoded ID data is registered ID data, and transmitting the encoded key data to the memory card by the wireless type reader/writer;
• decoding the encoded key data received from the wireless type reader/writer, and decoding the certification data obtained by further encoding the certification data encoded by the key data received from the contact type reader/writer;
• decoding the decoded certification data by use of the decoded key data;
• decoding the key data received from the wireless type reader/writer when certification of the combination card is confirmed based on the decoded certification data;
• encoding predetermined data held in the memory by use of the decoded key data, further encoding the encoded predetermined data and transmitting the encoded predetermined data to the contact type reader/writer;
• and
• decoding the encoded predetermined data received, and performing an predetermined operation by the contact reader/writer.