It is possible to extend the communicable distance between a noncontact information medium(semiconductor integrated circuit) and a reader/writer performing noncontact communication with the noncontact information medium and to ensure stabilized data transmission/reception even if the power supply voltage lowers when data is sent from the noncontact information medium back to the reader/writer. When data is sent back from the noncontact information medium, the data to be sent back is held in a logic circuit section(200) operable at a voltage lower than that of a nonvolatile memory circuit section(300). During a period when the data is sent back, a reset detection lower limit voltage for use in a reset generating circuit(160) is lowered as compared with other periods. |