This is an LSI for contactless IC tags supporting Near Field Communication (NFC) technology. Just approaching to IC tags, NFC devices like smartphones can communicate with them to read/write data. Embedding this LSI in various equipments enables radio communication between them and NFC devices. In addition, with built-in memory for data retention, this LSI can be used as an individual wireless IC tag. This LSI works with the power supplied wirelessly from NFC devices, and enables radio communication to NFC devices even while equipments with this LSI are turned off. Using this LSI as an individual contactless IC tag enables you to configure the system without power supply.