CONTACTLESS COMMUNICATION DEVICES ELECTRONIC SYSTEMS HAVING THE SAME AND METHOD OF OPERATING CONTACTLESS COMMUNICATION DEVICES

摘要

A contactless communication device includes a transceiver and a contactless communication chip. The transceiver generates an antenna voltage based on an electromagnetic wave received from an external device. The contactless communication chip operates based on an internally generated internal clock signal, transmits/receives data to/from an external device through the transceiver, generates a reference clock signal based on the antenna voltage, and corrects the frequency of the internal clock signal based on the reference clock signal. So, the frequency accuracy of a clock signal can be improved.