METHOD FOR ENABLING EXCHANGE OF DATA BETWEEN SMART CARD AND DEVICE IN CASE OF UNSUITABLE INTERRUPTION OF POWER SOURCE FOR THE SAME DEVICE

摘要

PROBLEM TO BE SOLVED: To enable a smart card to exchange data with a device for supplying a permanent clock signal to the smart card in the case of operation in a permanent mode. SOLUTION: During the operation in the permanent mode, many clock pulses sufficient for completing urgent read/write operation can be inputted to the smart card after the disappearance of a permanent clock signal Clkp by a step for detecting the urgent disappearance of this permanent clock signal Clkp and a step for replacing the permanent clock signal Clkp with an auxiliary clock signal Clkt.