METHOD AND SYSTEM FOR CALCULATING A CLOCK FREQUENCY OF A CLOCK SIGNAL FOR AN IC CARD

摘要

A clock frequency of a clock signal is calculated, with the clock signal being received by an IC card from a terminal or an internal clock within the IC card. A first time-stamp is received from the terminal, and a first value of the timer is set. The timer of the IC card is started when the first time-stamp is received. A second time-stamp is received, and a second value of the timer is read when the second time-stamp is received. The frequency is calculated by comparing a difference between the second and the first timer values, and a difference between the second and the first time stamps.