Noncontact transmission device

Abstract

A noncontact transmission device () is provided with a monitoring clock oscillator () for outputting a monitoring clock (LF) having a frequency lower than that of a system clock (CK); a control circuit (); a memory () having information (D) stored to be used by the control circuit (); and a reset circuit (). The control circuit () includes an internal storage circuit for storing the information (D) read out from the memory (). The control circuit () reads out and updates the information (D) stored in the internal storage circuit from the memory () with an update period based on the monitoring clock (LF). Furthermore, the control circuit () is reset with a reset period longer than the update period based on the monitoring clock (LF), and, each time the control circuit () is reset, reads out the information (D) from the memory () and updates the information (D) stored in the internal storage circuit.