A microcomputer on a non-contact IC card

摘要

A non-contact IC card using a microcomputer 50 comprises: an antenna circuit 60 for transmitting and receiving data in a non-contact manner to and from the outside; a CPU 1 for processing data; a receiving circuit 40 for detecting a receive signal received by the antenna circuit; a decoding circuit 10 for inputting a demodulated signal of a predetermined length to the CPU, when the receiving circuit 40 detects the receive signal; an attenuation circuit 20 for attenuating the electric oscillation of the antenna circuit 60, when the receiving circuit detects the receive signal; and a transmitting circuit 30 for transmitting a transmit signal via the antenna circuit 60 from the CPU to the outside.