FR2553209A1 - METHOD AND DEVICE FOR PROCESSING AN INTEGRATED CIRCUIT CARD, AND INTEGRATED CIRCUIT CARD ADAPTED TO THIS PROCESSING - Google Patents

Abstract

IN THE DEVICE ACCORDING TO THE INVENTION, TWO WINDINGS 104, 40; 103, 15 AND A MEANS 34; 16 OF MAGNETIC DETECTION ARE PROVIDED IN AN INTEGRATED CIRCUIT CARD 2 AS WELL AS IN A PROCESSING DEVICE 1 OF SIMILAR CARDS, WHICH ALLOWS TO FORM A PAIR OF WINDING-WINDING COUPLINGS AND TWO PAIRS OF WINDING-MIDDLE WINDING COUPLINGS THE CARD AND THE PROCESSING DEVICE, FOR CONDITIONS IN WHICH MAGNETIC PATHS ARE COMMON. THUS, WE CAN TRANSMIT AN ELECTROMAGNETIC FIELD PRESENTING A CERTAIN CLOCK FREQUENCY USING THE WIND-WINDING COUPLING TO FORM A CLOCK SIGNAL AND A POWER SUPPLY CURRENT, AND WE CAN TRANSMIT A DATA SIGNAL USING IT. COUPLING WINDING-MEANS OF MAGNETIC DETECTION. WHEN THE DATA SIGNAL AND TRANSMITTED FROM ONE OF THE TWO ELEMENTS, THE CI CARD OR THE PROCESSING DEVICE, ON THE OTHER, THE TRANSMISSION OF THE SECOND ELEMENT TO THE FIRST IS INTERRUPTED.

Description

The present invention relates to a slow card to card processing method.

  integrated circuit, a device intended to carry out the

  processing, and an integrated circuit card suitable for processing.

  Hitherto, as cards of the type on which various species of data are stored, there have generally been used passive data carriers of the perforated type, of the metal insert type, of the type carrying an optical coded configuration.

  visible or invisible, or of the magnetic sheet type, in particular.

  More recently, as a result of the development of micro10 electronics, it has become possible to incorporate an active electronic circuit, for example a microprocessor, a read only memory, a random access memory, etc., into the card. Circuit cards have thus been produced. integrated (CI) of the type which can exchange data in both directions, which allow not only that a data recorded on the card is delivered to a terminal equipment (processing unit), but also that a data is written on the card in

  origin of terminal equipment.

  When using such IC cards, it is necessary to connect the card and the terminal equipment using a means of connection to ensure the electrical supply of an electronic circuit and the exchange of data. mutual transmission of electrical energy Certain means of mutual transmission of electrical energy are constituted by electrical contacts located at the

  both on the card and on the terminal equipment.

  However, these electrical contacts are likely to see their state deteriorate as a result of the various stains brought by the use of the cards, or else can quite easily break in the event of folding of the cards, all this resulting in a lack

reliability.

  For this reason, it has been proposed to carry out the transmission by a contactless system, for example a transmission by capacity, an optical or thermal transmission, a transmission by modulated high frequency, or a transmission by induction, in particular Some of the preceding systems can validly ensure the transmission of the terminal equipment to the card, but are not suitable for the transmission of the card to the terminal equipment This is due to the fact that it is necessary to be able to have an important place, which cannot be provided on a memory card meeting ISO standards, or the fact that a special wave shaper, or other device, in the form of analog electronic parts, must be used to convert the transmitted signal to the d form original wave. An object of the invention is to propose a method for processing an IC card, an associated processing device, and an IC card, all of this being of compact configuration and having a

  simplified circuit, while making it possible to ensure mutual transmission between a card and a terminal equipment.

  To achieve this object according to the invention, two windings and a magnetic detection means are provided on the IC card as well as on the processing device, which makes it possible to form a pair of winding-winding couplings and two pairs of couplings. winding-magnetic detection means between the IC card and the processing device under conditions where the magnetic paths are mutually common, so as to transmit an electromagnetic field having a clock frequency by using the winding-winding coupling to form a clock signal and a power supply current, and to transmit a data signal using the winding-medium coupling

  magnetic detection, o, lqrsque the data signal is transmitted from one of the following elements, the IC card and the processing device, to the other, the transmission from the second element to the first 25 is interrupted.

  In the embodiment, the winding used to transmit the clock signal which supplies the power supply to the CI card and the winding used to transmit the data are each in the form of a flat winding L ' The flat winding used for data transmission is arranged in the central part of the CI card with, for example, a semiconductor magnetic detection means, and the winding serving for the data transmission which is placed on the processing device. is wound on an annular ferrite core comprising an air gap in which the CI card is inserted, the detection means

  semiconductor, for example, being placed in the air gap.

  The configuration thus achieved makes it possible to obtain a mutual transmission of the data, including the control instructions, between the CI card and the processing device, without

electric contact.

  The following description, intended for illustration

  of the invention, aims to give a better understanding of its characteristics and advantages; it is based on the appended drawings, among which: FIG. 1 is a block diagram showing an embodiment of a card processing device according to the invention; FIG. 2 is a block diagram showing an embodiment of a CI card according to the invention; Figure 3 is a circuit diagram showing the relationships between the processing device and the IC card shown in Figures 1 and 2; Figures 4 and 5 are explanatory views showing how the IC card is placed in the processing device; Figure 6 is an explanatory view for illustrating an example experiment showing the waveforms of signals appearing during transmission from one winding to the other winding and from one winding to a Hall sensor; Figure 7 is a circuit diagram showing a discriminator used in the invention; Figure 8 is a circuit diagram showing terminal equipment used in the invention; Figure 9 is a circuit diagram showing how the ferrite core is arranged to form a magnetic transmission path; and figure 10 shows a synchronization waveform

  signals used in the terminal equipment and the CI card.

  In FIG. 1, a typical assembly of the processing device used in an embodiment of the invention is presented. The reference number 101 designates a clock signal generator producing a clock signal with a frequency of 4 , 9152 M Hz The clock signal is, on the one hand, amplified by an amplifier 102 to then be delivered to a power transmission winding 103 by which it is transmitted in the direction of an IC card (not shown) D on the other hand, the clock signal coming from the generator 101 is delivered to a frequency divider circuit 11 which forms two types of clock signals of respective frequencies 300 Hz and 9.6 k Hz The clock signal of frequency 300 Hz is supplied to a repositioning circuit 12 to be used as a synchronization signal making it possible to successively carry out several data transmission and reception operations The 10 repositioning circuit 12 has the function of repositioning a door 1 8 serving for the reception of the data, a door 14 serving for the transmission of the data, and a circuit 17 for controlling the data, as well as the component circuits connected thereto, via a synchronization circuit 13 It should be noted that this operation of

  repositioning can be carried out from the detection of the insertion of the CI card.

  The other clock signal, of frequency 9.6 k Hz, is delivered to the synchronization circuit 13, to the data reception gate 18, to the data transmission gate 14 and to the data control circuit 17 , and acts as the basic operating synchronization for the constituent circuits The circuit 17 of data control has the function of adding a start signal to the data coming from a memory 20 via the data transmission gate 14 for transmitting the data to a data transmission winding 15, or else to deliver to a display unit 19, via the data reception door 18, the data coming from the data control circuit 17 coming from an integrated circuit 16 incorporated

of a Hall sensor.

  FIG. 2 schematically represents an example of an internal circuit of the IC card, o, when the latter has been inserted into the processing device, an electromagnetic field intended to ensure both the supply of clock signals and the electrical power supply is provided by the processing device so as to allow data transmission to the

  processing device and from the processing device.

  An electric field having a certain clock frequency (4.9152 R Hz) which has been emitted by the power transmission winding 103 of the processing device is received by the power reception winding 104 Then, a signal d clock is picked up by a sensor circuit 105 to be delivered to a first frequency divider circuit 31 At the same time, an electrical supply voltage + V is picked up by a rectifier circuit 106 from the winding 104 for receiving power from

  so as to supply the electrical power thus captured to each circuit 10 constituting the card.

  The first frequency divider circuit 31 divides the clock signal at 4.9152 M Hz into frequency to form a clock signal at 153.6 k Hz, which is supplied to a conforming circuit 32

  waveform and a second frequency divider circuit 33.

  The function of the waveform shaping circuit 32 is to pick up a start signal in order to deliver it to the second frequency divider circuit 33, and to pick up a data based on the clock signal as well as the data received from a Hall sensor-type integrated circuit 34 for supplying it to a data control circuit 35 The second frequency divider circuit 33 forms a clock signal at 9.6 k Hz from the clock signal of 153, 6 k Hz in order to deliver it to an end signal producing circuit 41, a synchronization circuit 36, a data transmission gate 39 and a data control circuit 35 The synchronization circuit 36 determines the synchronization timing of the circuit 35 for controlling the data, the gate 39 for transmitting data and the circuit 41 for producing the end signal More particularly, the synchronization circuit 36 first authorizes the circuit 35 for controlling the data to enter into service so to deliver the data received from circuit 32 30 waveform shaper - to a comparison circuit 37 to merge this data with storage data contained in a memory 38 Then, the synchronization circuit 36 activates circuit 35 of data control and the data transmission gate 39 so that the result of the comparison 35 carried out in the comparison circuit 37 is delivered to a transmission coil 40 via the data transmission gate 39 for transmission to the device processing (FIG. 1) After that, the synchronization circuit 36 allows the circuit 41 for producing the end signal to enter into service, which ends operation

  of the second frequency divider circuit 33.

  We will now describe the joint operation of the processing device shown in Figure 1 and the IC card shown in Figure 2. When inserting the CI card in the processing device, an electromagnetic field having a certain clock frequency is transmitted by the power transmission winding 103 to the power reception winding 104 of the

  CI card Thus, the CI card is ready to supply the electrical power and to form a clock signal.

  On the other hand, a means for detecting the insertion of the card (symbolized by 12 ′) activates the repositioning circuit 12 so that a repositioning signal is produced intended for the synchronization circuit 13, which allows repositioning of each of the circuits connected to the synchronization circuit 13 After that, the synchronization circuit 13 authorizes the entry into service of the data control circuit 17, which ensures the transmission of the storage data contained in the memory 20 to 1 transmission winding 15 via the data transmission gate 14 In this case, the data transmission gate 14 transmits the data to the header of which

  has been added a start signal.

  The data transmitted by the transmission winding 25 is detected by the Hall sensor type integrated circuit 34 existing in the CI card, so that it is delivered to the circuit 32 waveform shaping This circuit 32 detects the start signal initially placed at the header of the received data signal and, then, delivers it to the second frequency divider circuit 33, by making

  start operation of the second frequency divider circuit 33.

  Thus, the circuit 33 begins to transmit a clock signal of frequency 9.6 k Hz.

  Then, the waveform shaping circuit 32 delivers the data signal to the data control circuit 35. 35 Then, the synchronization circuit 36 causes the delivery to the comparison circuit 37 of the data which has been sent to the data control circuit 35 so that it is compared with the data contained in the memory 38 Then, the result of the

  comparison is picked up by the data control circuit 35.

  Next, the synchronization circuit 36 opens the data transmission door 39 in order to deliver the result of the comparison from its data control circuit 35 to the winding of

transmission 40.

  The result of the comparison transmitted by the transmission winding 40 is received by the Hall sensor type integrated circuit 16 of the processing device to be delivered to the data control circuit 17 At the instant when the result of the comparison has been delivered, the synchronization circuit 13 supplies this result, contained in the data control circuit 17, to the display unit 19 via the data reception door 18, so that the data appears on the unit d 'display 19 The data thus displayed is read by an inspector or operator, who undertakes, with regard to the bearer of the CI card, the appropriate action. FIG. 3 is a circuit comprising the electrical power supply system 20 and the data reception and transmission system for the processing device 1 in FIG. 1 and the IC card 2 in FIG. 2 FIG. 3 is separated,

  in its central part, by a double dotted line, indicating that the processing device 1 is placed to its left and that the IC card 25 2 is placed to its right, the CI card 2 being assumed to be inserted in the processing device 1.

  With regard to the power supply system, a high frequency oscillator 102 supplies high frequency electric power to the planar power supply winding 103 according to the clock signal of frequency 4.9152 M Hz coming from the generator 101 of clock signals Thus, when the clock signal is of high level "R", the diode D 1 becomes nonconductive, while the diode D 2 becomes onductive As a result, the transistor Qil becomes conductive, so that the transistor Q 21 35 becomes nonconductive On the contrary, when the clock signal goes to low level "B", the diode D 1 becomes conductive, while the diode D becomes nonconductive As a result, the transistor Ql 2 i becomes non conductive, so that conductor Q, 21 becomes non-conductive, while transistor Q 12 becomes conductive, so that transistor Q 22 becomes conductive As a result, a field effect transistor Q 23 placed at its output stage performs a fo conduction-non-conduction type operation

  frequency 4.9152 M Hz to excite winding 103.

  Thus, a high frequency current is induced in the power reception winding which is placed in the IC card 2 On the one hand, the induced current is captured in the form of clock signal and, on the other hand, it is rectified by diode D 3, then supplied to a circuit 106 A of constant voltage via a fiitering circuit of the resistance-capacitance type for example, so as to be transformed into an output level at constant voltage The output signal 15 of constant voltage thus obtained is delivered to each of the circuits placed in the card CI 2 via a noise eliminator circuit. We will now describe the operation of the data transmission-reception system. We first refer to the data transmission system 20 of the IC card 2 to the processing device 1 When a data signal of 9600 bits per second is delivered by the gate 39 for transmitting data to an output amplifier 40 A, the data signal is, on the one hand, delivered to a transistor Q 28 via an inverter INV 2 and, on the other hand, it is directly delivered to a transistor Q 27 This allows the transistors Q 27 and Q 28 to come respectively conductive and non-conductive in

  keeping a mutual phase shift of 180, which excites the winding 40 so that it delivers data in one direction and in the opposite direction.

  As a result, an electric field 30 varying in alternating directions is produced in the winding 40 The magnetic field thus produced is detected by the Hall element 16 Consequently, a signal indicative of the magnetic field is amplified by a Q-transistor 24 constituting an input amplifier 16 A, then the signal thus

  amplified is delivered to the data control circuit 17 The input amplifier 16 A has a variable resistor VR 1 allows

255 323 09

  both to adjust the zero point of Hall element 16 A and a variable resistor VR 2 to adjust the gain of the input amplifier 16 A. We will now describe the operation of the data transmission system from the processing device 1 to the card CI 2. When a data signal of 9600 bits per second is delivered by the data transmission gate 14 to the output amplifier 15 A, this data signal is, of a on the one hand, supplied to transistor Q 25 via an inverter INV 1 and, on the other hand, is supplied directly to transistor Q 26 This allows transistors Q 25 and Q 26 to be alternately in conduction and in non-conduction, keeping between them a phase shift of 180, thus exciting the data delivery winding 15 in alternating directions. This produces in winding 15 a magnetic field varying in alternating directions. The magnetic field thus produced is detected by the Hall element 34 placed in CI card 2 The signal indicating the mag field netic is amplified by a transistor Q 29 constituting an input amplifier 34 A, then the amplified signal is supplied to circuit 32 waveform shaping In the same way as the input amplifier 16 A placed in the device processing 1, the 34 A input amplifier has a variable resistor VR 3 used to adjust the gain of the 34 A input amplifier and a variable resistor VR 4 allowing the zero point of the Hall element Figures 4 and 5 show the IC card placed in the processing device. In these figures, instead of the entire processing device 1 having been shown, it is only shown, to represent the processing device 1, that a power supply system comprising a power transmission winding 103 and power transmission circuits 101 and 102, and a data transmission-reception system comprising a ferrite core, the winding 15 and the element Hall 16 Winding 1 03 of power transmission and the magnetic gap of the ferrite core are arranged so as to be mutually

  coplanar, and the Hall element 16 is placed in the central part 35 of the end surface of the ferrite core looking at the magnetic air gap In correspondence with it, a power reception winding 104, the Hall element 34 for input of data and the data delivery winding 40 are provided in the card CI 2.

  When the IC card 2 is inserted in a predetermined position of the processing device 1, the power supply system and the data transmission-reception system are coupled together. Thus, the power supply system and the transmission system- data reception each form a

special magnetic circuit.

  We will now describe another embodiment

  of the invention in relation to Figures 6 to 10.

  This embodiment makes possible the transmission and reception of electrical signals, preferably a series of digital signals in the form of a magnetic signal, between the terminal equipment and the IC card through the use of the combination. of the magnetic winding and the Hall sensor, and also makes it possible to bring these magnetic signals in the form of a series of electrical states corresponding to them without distortion When a transmission is carried out between the winding and the winding 201 (FIG. 6), the signals to be transmitted are differentiated according to the law of induction. Consequently, these signals must be brought back to their original form using an electronic circuit. In addition, a sensor of Hall 202 provides a voltage proportional to the magnetic field The voltage

  thus produced regenerates a magnetic field without distortion.

  As shown in FIG. 7, a discriminator is provided comprising, as main components, a source of electrical supply 204, a Hall sensor 34, a winding 40

  writing, logic circuits 207, 208 and 209 and a memory.

  The electrical power source 204 is in the form of a resonant circuit which produces a frequency tuned to a frequency of the terminal equipment and which comprises a rectifier and a voltage regulator In their place, according to another example, the electrical power source may include a solar cell or an ordinary battery An integrated circuit includes several counters 207, a shift register 208 and two comparators 209 In the circuit arranged in the IC card, the 35 logic circuits and the memories, including a Hall sensor, can take the form of a single integrated circuit When the discriminator is in the form of a flat card, the easiest way to manufacture the resonant circuit constituting the power supply source is to use incision printing technology A flat writing winding is coaxially placed directly on the Hall sensor The discriminator can be formed so that certain some of its parts are caught between plastic, paper, or equivalent material, to eliminate exposed contact

outside.

  As shown in FIG. 8, the largest units Ies of the terminal equipment correspond to the units of the discriminator The terminal equipment is also provided with a write winding 15, a Hall sensor 16, several counters 212

and a shift register 213.

  In this example, a magnetic transmission path

  comes in a form using an annular ferrite core.

  As shown in FIG. 9, which illustrates an example of transmission from the terminal equipment to the CI card, the magnetic transmission path is arranged inside a circuit comprising 20 windings and the Hall sensor provided in the terminal equipment and the card The ferrite core has the function of concentrating the magnetic field in order to increase the efficiency and eliminate the influence of an external magnetic field by which the transmission may be parasitized The writing winding 15 25 placed in the terminal equipment is directly wound on the

  ferrite core The CI card is inserted in the terminal equipment so that the Hall sensor 34 is finally positioned between the p 6 magnets of the ferrite core On the other hand, the Hall sensor 16 belonging to the terminal equipment 30 is directly attached to p 8 the magnetic of the ferrite core.

  Thus, when the card is inserted into the terminal equipment, the

  Hall sensor 16 is positioned above the write winding 40 or the Hall sensor 34 of the card.

  At the write winding 15 wound on the ferrite core placed 35 in the terminal equipment, an electrical signal of rectangular shape is delivered, thus producing a corresponding magnetic signal. The magnetic signal thus produced is received by the Hall sensor. 34, then the magnetic signal thus received by the Hall sensor 34 is transformed into an electrical signal of rectangular shape Y 1 The electrical signal of rectangular shape is delivered in series to the shift register 220 and is converted by this from the series form to parallel form The rectangular electrical signals thus put in parallel form

  are compared with the preselected signal in the comparators 210.

  As a result of the comparison, when the two signals are mutually equal, the comparators 210 Q produce a response signal, which can be created as required, for example under the

form Y 2, for the case considered.

  When the discriminator is inserted into the terminal equipment, the high frequency generator which is configured so as to supply electrical energy to the discriminator becomes active, so that it produces a high frequency electromagnetic field. pulse signals (not shown) are obtained from the high frequency electromagnetic field

  in the terminal equipment and the discriminator.

  When the system is not active, the write winding 15 placed in the terminal equipment is excited, i.e. there is a magnetic field When a start instruction is given, the magnetic field produced in the write winding 15 is canceled The CI card detects the variation in the magnetic field 25, which starts the production of pulses in the discriminator In synchronism with the frequency of the pulses, a binary data stored in the equipment terminal is delivered in series, via, for example, a binary counter CB, a decimal-decimal-binary-type decoder DDCB and a shift register RD, to the Hall sensor 34 placed in the card, for each byte (8 bits ) via the write winding 15 in the form of magnetic pulses The magnetic pulses corresponding to the binary data are transformed into electrical signals by the Hall sensor 34 These electrical signals are stored in series in the shift register 2- 2 0 placed in the card At the end of the transmission (that is to say after the transmission of each of the 8 bits), these electrical signals are compared with the recorded data which is stored in the card When all the transmission is finished, the excitation of the write winding 15 placed in the terminal equipment is positioned at zero In this case, if the data delivered by the terminal equipment is equal to the data stored in the card, a signal corresponding to an indication positive (for example 1 bit) is delivered to the shift register 220 of the card On the contrary, if the data delivered by the terminal equipment is not equal to the recorded data, a signal corresponding to a negative indication (for example 8 bit) is issued

  to the shift register 220 placed in the card This signal is transmitted to the terminal equipment in the form of pulses via the write winding of the card and the Hall sensor 16 of the terminal equipment, if although the desired processing and display are performed.

  FIG. 10 shows the waveform of signals appearing in the card and the terminal equipment. The signals represented on the upper side of FIG. 10 relate to the pulses common to the terminal equipment and to the card. In this embodiment, a series of signals comprising 18 clock pulses, namely two groups of 8 bits of transmission data, a single start bit and a rest time of a length of about 1 bit at the end of the transmission, is used for transmitted

  sions and responses A start bit is always indicated relative to the data to be transmitted, and is followed by 8 data bits.

  When the start bit has been transmitted, the terminal equipment is ready to receive a response signal, of a maximum length of 8 bits, which is transmitted back to it by the card In the card, the comparator produces a signal response after reception 30 of the data The comparator determines the type of response obtained and, at the same time, activates the data transmission system placed in the card Once the response is completed, it is produced

  an end signal The end signal terminates the data transmission operation by the transmission system placed in the card, which allows the card to receive the next group of data.

  In FIG. 10, one finds in order, from the top: the clock signal at 9.6 k Hz; the signal sequence (18 clock pulses); the transmission data; the reception data; then the clock signal at 9.6 k Hz; the signal sequence; the reception data; the response signal; the

  transmission data; the end signal; and the transmission switching signal.

  As indicated above, the data transmission system for use with the CI card is in a form such that it transmits and receives control instructions and data, from terminal equipment to the CI card as well that in the other direction, apart from the existence of any contact Thus, this eliminates the need to form electrical contacts on the surface of the card and leads to the impossibility of a failure due to a contact failure occurring as a result of the card becoming soiled, contact wear or breaking of electrical parts arranged in the card, as a result of static electricity, as could occur with contact systems according to prior art The transmission system according to the invention further makes it possible to exchange data even in the case where the card has been folded to a certain extent. In addition, in the contactless system according to the prior art number of pieces of circuit increases, which complicates the structure to the point that all the space existing on the card is likely to be occupied by the parts. On the contrary, the data transmission system according to the invention uses a magnetic path configured by a sensor. Hall and a flat winding for transmission and reception, so that the transmission and reception unit can be small In addition, according to the invention, since the Hall sensor and the flat winding are configured so concentric, or that a microprocessor, logic circuits and memories comprising the Hall sensor can be incorporated in an integrated circuit, a greater miniaturization can be achieved In addition, the transmission system according to the invention is configured so receive a magnetic signal using the Hall sensor, which transforms the magnetic signal into an electrical signal without distortion, eliminating the need

  incorporate analog electrical parts into the circuit.

  Thus, the operation of the circuit is simplified and allows high reliability to be obtained, which makes it possible to carry out a bidirectional data exchange covering large applications

  between the terminal equipment and the integrated circuit card.

  Of course, those skilled in the art will be able to imagine,

  from the method, the device and the card, the description of which has just been given by way of illustration only and in no way limitative, various variants and modifications not departing from the

part of the invention.

Claims (6)

R E V E N D I C A T I O N S   1 "Method for processing an integrated circuit card, or CI card, in which a CI card is inserted, comprising a data storage element and a data processing element, in a de-card processing device comprising a data storage element and data processing element, for the purpose of transmitting data between said CI card and said card processing device according to a contactless electromagnetic system in order to be able to pass judgment on the data contained in said CI card, said - method being characterized in that: a) when the data is transmitted from one of the two bodies, said CI card or said processing device, to the other, a signal is added start at the header of the data 15 to be transmitted for the transmission of binary data, and b) the other of the two members, said CI card or said processing device, performs a reception operation   as soon as said start signal has been received.   2 Method according to claim 1, characterized in that the data transmission between said CI card and said processing device is effected by means of a single magnetic path 3 _ Method according to claim 2, characterized in that the power supply is delivered to said CI card by said processing device, via another path, different from said magnetic path by which data transmission takes place. 4 Method according to claim 3, characterized in that an electromagnetic signal having a certain frequency   the clock is transmitted by said magnetic path serving the power supply.   Integrated circuit card processing device, or IC card, which is configured to supply electrical power and a clock signal to an IC card comprising a data storage element and a data processing element and to transmitting data to said CI card and receiving it, said processing device being characterized in that it comprises: a) a generator (101) of clock signals producing a clock signal, b) a winding (102, 103) of electric power transmission serving to supply to said IC card an electromagnetic field from said clock signal, c) a memory (20) in which predetermined data is recorded, d) a winding (15) of transmission of data used to transmit data in the form of a signal indicative of the electromagnetic field, e) a magnetic detection element (16) which responds to said signal indicative of the electromagnetic field by producing a corresponding electrical signal spondant, f) a display unit (19) for displaying the electrical signal coming from said magnetic detection element, and g) a data processing circuit (11 to 14, 17, 18) which transmits a data signal from said memory to said data transmission winding in response to said clock signal, and which then provides said display unit with a   data signal from said magnetic detection element.   6 Device according to claim 5, characterized in that said data processing circuit has the function of transmitting a data signal obtained by adding a start signal to said data signal coming from said magnetic detection element. 7, Device according to claim 5, characterized in   that said transmission winding is wound on a core 30 comprising an air gap in which said CI card is inserted.   8 Device according to claim 7, characterized in that said magnetic detection element is arranged in the air gap placed in said core.   9 Integrated circuit card comprising an element of emma35 gas data processing and a data processing element, or said integrated circuit card, or CI card, is intended to be inserted in a CI card processing device so that an electrical power and a clock signal be delivered to it for the transmission of data from said CI card to said processing device and for the reception of data from the processing device, said CI card being characterized in that it comprises: a) a winding (104) for receiving electrical power used to receive an electromagnetic field from a clock signal coming from said processing device, b) a circuit (105, 106) making it possible to obtain the clock signal and an electric current from the output signal of said power reception winding, c) a memory (38) in which predetermined data is recorded, d) a detection element (34) ma genetics which receives the electromagnetic signal from a data transmission winding, e) a data transmission winding (40) used to transmit data in the form of an electromagnetic magnetic signal, and f) a circuit (31 to 33, 35 to 37, 39, 41) of data processing which compares the data signal coming from said magnetic detection element with the content recorded in said memory in synchronism with said clock signal so as to transmit the result of the comparison via said winding transmission module (40) IC card according to claim 9, characterized in that said data processing circuit comprises a circuit (32, 33) serving to detect a start signal in the signal coming from said magnetic detection element, so as to start its operation in response to the output signal of said circuit detection of the start signal.   11 IC card according to claim 9, characterized in that said data transmission winding (40) comprises a flat winding, said magnetic detection element being placed in its center. 12 IC card according to claim 9, characterized in   that said power receiving winding comprises a planar winding.