CHIP CARD HAVING A CONTACT INTERFACE AND A CONTACTLESS INTERFACE

摘要

The invention relates to chip cards having a contact interface and a contactless interface. It is not possible to simultaneously operate both interfaces. Only one of the two interfaces can be operated. The aim of the invention is to simultaneously operate both interfaces (KI, KLI) of a chip card having one contact interface (KI) and a contactless interface (KLI) for data transmission. The contact interface (KI) is connected to a first data line (DL1) and the contactless interface (KLI) is connected to a logical circuit (MC) via a second data line (DL2). A controllable switch (S1, S2) can be provided in one or both data lines (DL1, DL2) respectively. Said switch is controlled by the logical circuit (MC) which is preferably embodied as a microcontroller or microprocessor. The cycle (CL) for the microcontroller or the microprocessor (MC) can be generated from the cycle (CL1) supplied by the contact interface (KI) and the cycle (CL2) supplied by the contactless interface (KLI) by means of disjunctive connection in an OR gate (O) for instance. The inventive chip card can be realised in an advantageous manner as an electronic purse (EG) having a display device (AZ) for the state of an account.