JP5380404B2 - Portable electronic device, portable electronic device processing system, and portable electronic device processing method - Google Patents

Description

  Embodiments described herein relate generally to a portable electronic device that transmits and receives data by wireless communication, a processing system for the portable electronic device, and a processing method for the portable electronic device.

  In general, an IC card used as a portable electronic device includes a card-like main body formed of plastic or the like and an IC module embedded in the main body. The IC module has an IC chip. The IC chip has a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory) or a flash ROM that can hold data even in the absence of a power source, and a CPU that executes various operations.

  The IC card is, for example, an IC card conforming to the international standard ISO / IEC7816. The IC card is excellent in portability and can perform communication with an external device and complicated calculation processing. Further, since it is difficult to forge, the IC card is assumed to store highly confidential information and be used for a security system, electronic commerce, and the like.

  The IC card as described above can store various applications. When receiving a command from the IC card processing device (card reader / writer) by contact communication or non-contact communication, the IC card executes an application in accordance with the received command. Thereby, the IC card can realize various functions.

Japanese Patent No. 3488166

  An IC card that performs non-contact communication includes a resonance unit such as an antenna and an IC chip (LSI). In addition, some IC cards that perform non-contact communication include a capacitor and a resistor connected to the outside of the IC chip, for example.

  Usually, the characteristics of the antenna connected to the IC chip are constant to some extent. For this reason, conventionally, the transmission / reception characteristics in the IC chip are set to be constant.

  However, in recent years, various shapes of IC cards have been put into practical use. That is, an antenna having a different shape may be mounted on the IC card. In order to cope with this, a card reader / writer for processing an IC card needs to perform communication with transmission / reception characteristics adapted to the size and / or shape of an antenna mounted on the IC card for communication. As a result, a plurality of card reader / writers having different transmission / reception characteristics have been put into practical use.

  Further, the IC chip of the IC card adapts the IC card to the communication characteristics of the card reader / writer by performing impedance matching in a range corresponding to the antenna to be connected.

  However, an antenna having a different shape may be connected to the IC chip of the IC card. That is, at the manufacturing stage of the IC chip, the IC chip cannot specify the shape of the antenna to be connected. For this reason, the IC chip has a problem in that impedance matching cannot be performed properly when an antenna other than the shape set at the time of manufacture is connected.

  In addition, when manufacturing different IC chips for each antenna shape, there is a problem that costs are increased.

  Accordingly, it is an object to provide a portable electronic device, a portable electronic device processing system, and a portable electronic device processing method that are inexpensive and can be connected to a plurality of antennas having different shapes. .

  A portable electronic device according to an embodiment is a portable electronic device that can be equipped with a resonance unit that generates an electrical signal in response to radio waves output from an external device, and the electrical signal generated by the resonance unit A transmission / reception unit that performs signal processing, a setting information storage unit that stores parameters for each antenna size of the resonance unit, an antenna size storage unit that stores information indicating the antenna size of the resonance unit, and the setting information storage And a transmission / reception characteristic control unit that reads out a parameter corresponding to information indicating the antenna size stored in the antenna size storage unit and controls the transmission / reception characteristic of the transmission / reception unit based on the read parameter.

FIG. 1 is an explanatory diagram for describing an example of a configuration of a processing device of a portable electronic device according to an embodiment. FIG. 2 is an explanatory diagram for explaining a configuration example of the IC card shown in FIG. FIG. 3 is an explanatory diagram for explaining an example of the shape of the resonance portion of the IC card shown in FIG. FIG. 4 is an explanatory diagram for explaining an example of the shape of the resonance portion of the IC card shown in FIG. FIG. 5 is an explanatory diagram for explaining the relationship between the shape of the resonance portion and the set value. FIG. 6 is an explanatory diagram for explaining the operation of the IC card shown in FIG. FIG. 7 is an explanatory diagram for explaining the operation of the IC card shown in FIG. FIG. 8 is an explanatory diagram for explaining the operation of the IC card shown in FIG.

  Hereinafter, a portable electronic device, a portable electronic device processing system, and a portable electronic device processing method according to an embodiment will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram for describing an example of a configuration of a processing device of a portable electronic device according to an embodiment.
As shown in FIG. 1, the IC card processing system 1 includes a portable electronic device processing device (terminal device) 10 and a portable electronic device (IC card) 20. The terminal device 10 and the IC card 20 transmit / receive various data to / from each other by non-contact communication.

  As shown in FIG. 1, the terminal device 10 includes a control unit 11, a display 12, a keyboard 13, a card reader / writer 14, a storage unit 15, and the like.

The control unit 11 includes a CPU, a ROM, a RAM, and the like. The control unit 11 controls the operation of the entire terminal device 10.
The display 12 displays various information under the control of the control unit 11. The keyboard 13 receives an operation by the operator of the terminal device 10 as an operation signal.

  The card reader / writer 14 is an interface device for communicating with the IC card 20. The card reader / writer 14 performs power supply, reset control, and data transmission / reception with respect to the IC card 20. Further, the card reader / writer 14 may supply a clock to the IC card 20 in some cases. As described above, the card reader / writer 14 functions as a transmission / reception unit.

  The control unit 11 inputs various commands to the IC card 20 by the card reader / writer 14. For example, when receiving a data write command from the card reader / writer 14, the IC card 20 performs a process of writing the received data in an internal nonvolatile memory.

  The control unit 11 reads data from the IC card 20 by transmitting a read command to the IC card 20. The control unit 11 performs various processes based on the data received from the IC card 20. Further, the control unit 11 can write data to the memory of the IC card 20 by transmitting a write command to the IC card 20.

  The card reader / writer 14 transmits / receives data to / from the IC card 20 by wireless communication. For example, the card reader / writer 14 includes a signal processing unit, a transmission / reception circuit, an antenna (resonance unit), and the like. Similarly, the IC card 20 includes a signal processing unit, a transmission / reception circuit, an antenna (resonance unit), and the like.

  The signal processing unit encodes, decodes, modulates, and demodulates data transmitted to and received from the IC card 20. The transmission / reception circuit amplifies the data modulated by the signal processing unit and the data received by the antenna.

  The card reader / writer 14 transmits data to the IC card 20 by generating a magnetic field with an antenna according to the data to be transmitted. Further, the card reader / writer 14 recognizes data transmitted from the IC card 20 based on an induced current generated in the antenna by electromagnetic induction.

  The control unit 11 performs settings related to communication with the IC card 20 by transmitting an initial setting command to the IC card 20 by the card reader / writer 14. The initial setting command is, for example, a start command and a selection command. In order to detect the IC card 20, the card reader / writer 14 repeatedly transmits an activation command (for example, a request command and a wakeup command) to the communicable range.

  When the IC card 20 exists, a response to the activation command from the IC card 20 is returned to the card reader / writer 14. Thereby, the card reader / writer 14 detects the IC card 20. If the IC card 20 is a non-contact portable electronic device, the card reader / writer 14 transmits a selection command for selecting a desired IC card 20. Thereby, communication can be performed between the card reader / writer 14 and the IC card 20.

  The terminal device 10 transmits a mutual authentication command to the IC card 20 as necessary. Thereby, a mutual authentication process is performed. When mutual authentication is performed between the IC card 20 and the terminal device 10, the terminal device 10 first generates a random number, encrypts the generated random number, and transmits the encrypted data to the IC card 20. The IC card 20 decrypts the encrypted data and returns the decrypted data to the terminal device 10. Further, the IC card 20 generates a random number, encrypts the generated random number, and transmits the encrypted data to the terminal device 10. The terminal device 10 decrypts the encrypted data and transmits the decrypted data to the terminal device 10. The IC card 20 and the terminal device 10 perform mutual authentication by confirming whether or not the decrypted data transmitted from the communication target device matches the original random number data.

  The mutual authentication process described above is realized by performing transmission and reception of commands and responses twice between the IC card 20 and the terminal device 10.

  The storage unit 15 is a rewritable nonvolatile memory. The storage unit 15 stores setting data related to the control of the terminal device 10. For example, the storage unit 15 stores information related to transmission / reception characteristics in the card reader / writer 14.

FIG. 2 is an explanatory diagram for explaining a configuration example of the IC card shown in FIG.
As shown in FIG. 2, the IC card 20 includes, for example, a rectangular main body 21 and an IC module 22 built in the main body 21. The IC module 22 includes an IC chip 23 and an antenna (resonance unit) 24. The IC chip 23 and the resonance unit 24 are formed in the IC module 22 in a state where they are connected to each other.

  The main body 21 is not limited to a rectangular shape, and may have any shape as long as the IC module 22 in which at least the resonating portion 24 is disposed can be installed.

  The IC chip 23 includes a CPU 25, a ROM 26, a RAM 27, a nonvolatile memory 28, a transmission unit 29, a reception unit 30, a power supply unit 31, a logic unit 32, an impedance matching unit 33, and the like. The CPU 25, the ROM 26, the RAM 27, the nonvolatile memory 28, the transmission unit 29, the reception unit 30, the power supply unit 31, and the logic unit 32 are connected to each other via a bus. The impedance matching unit 33 may be arranged in the IC module 22 instead of in the IC chip 23.

  The resonance unit 24 is an interface for communicating with the card reader / writer 14 of the terminal device 10. The resonating unit 24 includes, for example, an antenna formed of a metal wire disposed in a predetermined shape in the IC module 22 and a tuning capacitor. The resonating unit 24 has a resonance frequency specified by the shape of the metal wire. The resonating unit 24 has a quality factor (Q) that is specified by a resonance frequency and a bandwidth around the resonance frequency. Q indicates the sharpness of resonance of the resonance unit 24, that is, the quality of the resonance unit 24.

  The IC card 20 generates a magnetic field by an antenna according to data transmitted to the card reader / writer 14. Thereby, the IC card 20 transmits data to the terminal device 10. Further, the IC card 20 recognizes data transmitted from the terminal device 10 based on an induced current generated in the antenna by electromagnetic induction.

  The CPU 25 functions as a control unit that controls the entire IC card 20. The CPU 25 performs various processes based on the control program and control data stored in the ROM 26 or the nonvolatile memory 28. For example, various processes are performed in accordance with commands received from the card reader / writer 14, and data such as responses as processing results is generated.

  The ROM 26 is a non-volatile memory that stores a control program and control data in advance. The ROM 26 is incorporated in the IC card 20 in a state where a control program, control data, and the like are stored at the manufacturing stage. That is, the control program and control data stored in the ROM 26 are incorporated in advance according to the specifications of the IC card 20.

  The RAM 27 is a volatile memory that functions as a working memory. The RAM 27 temporarily stores data being processed by the CPU 25. For example, the RAM 27 temporarily stores data received from the terminal device 10 via the resonance unit 24. The RAM 27 temporarily stores a program executed by the CPU 25.

  The non-volatile memory 28 is configured by a non-volatile memory capable of writing and rewriting data, such as an EEPROM or a flash ROM. The nonvolatile memory 28 stores a control program and various data according to the usage application of the IC card 20.

  For example, in the nonvolatile memory 28, a program file and a data file are created. A control program and various data are written in each created file. The CPU 25 can implement various processes by executing programs stored in the nonvolatile memory 28 or the ROM 26.

  The nonvolatile memory 28 includes a setting information storage unit 28a. The setting information storage unit 28 a stores information indicating settings in the transmission unit 29, the reception unit 30, and the impedance matching unit 33.

  The transmission unit 29 performs signal processing such as encoding and load modulation on data to be transmitted to the terminal device 10. For example, the transmission unit 29 modulates (amplifies) the signal based on the load modulation level stored in the setting information storage unit 28a. The transmission unit 29 transmits the signal subjected to signal processing to the impedance matching unit 33.

  The receiving unit 30 demodulates and decodes a signal received by the antenna. For example, the receiving unit 30 analyzes a signal received using the hysteresis width stored in the setting information storage unit 28a as a threshold value. Thereby, the receiving unit 30 acquires binary logical data. The receiving unit 30 transmits the analyzed data to the CPU 25 via the bus.

  The power supply unit 31 generates power based on radio waves transmitted from the terminal device 10, particularly carrier waves. Furthermore, the power supply unit 31 generates an operation clock. The power supply unit 31 supplies the generated power and operation clock to each unit of the IC card 20. Each unit of the IC card 20 becomes operable when supplied with power.

  The logic unit 32 is a calculation unit that performs calculation processing by hardware. For example, the logic unit 32 performs operations such as cryptographic processing based on a command from the terminal device 10. In addition, the logic unit 32 generates a random number. For example, when receiving a mutual authentication command from the terminal device 10, the logic unit 32 generates a random number and transmits the generated random number to the CPU 25.

  The impedance matching unit 33 improves the reception efficiency of radio waves by the resonance unit 24 by matching the impedance with the terminal device 10. The impedance matching unit 33 determines the strength of the signal transmitted from the terminal device 10 based on the output of the power supply unit 31. The impedance matching unit 33 adjusts the impedance based on the determined signal strength so that the output of the power supply unit 31 becomes an appropriate value. Note that any method may be used for impedance matching.

  3 and 4 are explanatory diagrams for explaining an example of the shape of the resonance part 24 of the IC card 20 shown in FIG. FIG. 3 shows the resonance unit 24A when the size (antenna size) of the resonance unit 24 is the card size (class 1) defined by ISO / IEC144443-1: 2008 Annex A. FIG. 4 shows the resonance unit 24B when the antenna size is smaller than class1. Although not shown, the IC card 20 may be configured to include a resonance unit 24 having an antenna size larger than class1.

  Normally, when the area of the loop antenna is A and the number of turns is N, the minimum operating magnetic field strength of the resonating unit 24 can be approximated by “constant / (A · N)”.

  The IC card 20 adjusts the inductance of the loop antenna in order to match the resonance frequency of the resonance unit 24 with the terminal device 10. Here, for example, when the capacitance of the tuning capacitor in the IC chip 23 is constant, the smaller the antenna size, the smaller the reception amplitude. That is, when the area A and the number of turns N are reduced, the minimum operating magnetic field strength is increased. For this reason, the reception amplitude becomes small.

  Further, when transmitting radio waves from the IC card 20 to the terminal device 10, the load modulation level tends to decrease as the antenna size decreases.

That is, the resonance unit 24A shown in FIG. 3 has a smaller minimum operating magnetic field strength than the resonance unit 24B shown in FIG.
FIG. 5 is an explanatory diagram for explaining the relationship between the shape of the resonance unit 24 and the set values of the respective units.

  Here, the relationship between the shape (antenna size) of the resonance unit 24, the hysteresis width (filter characteristic) of the comparator of the reception unit 30, and the load modulation level of the transmission unit 29 will be described. However, the setting value items are not limited to those described above, and the configuration values of other items related to transmission / reception characteristics may be associated with the antenna size.

  The setting information storage unit 28a has a table as shown in FIG. The table of the setting information storage unit 28a stores the antenna size, the hysteresis width of the comparator of the reception unit 30, and the load modulation level of the transmission unit 29 in association with each other. That is, the IC card 20 can determine the hysteresis width and the load modulation level according to the antenna size.

  As described above, when the antenna size is reduced, the amplitude of the signal received by the receiving unit 30 is reduced. For example, when the antenna size of the resonance unit 24 is “class 1 size”, it is assumed that the hysteresis width of the comparator of the reception unit 30 can be adjusted in the range of c to d.

  For example, when the antenna size of the resonance unit 24 is “a size smaller than the class 1 size”, it is assumed that the hysteresis width of the comparator of the reception unit 30 can be adjusted in the range of a to b. In this case, the hysteresis width values a, b, c, and d satisfy the relationship of “a <b ≦ c <d”. Note that b and c may be reversed, i.e., "b> c".

  The IC card 20 reads the hysteresis width used for the comparator of the receiving unit 30 from the setting information storage unit 28a according to the antenna size of its own resonance unit 24. For example, when the antenna size of the resonance unit 24 is “class 1 size”, the IC card 20 reads “cd” as the hysteresis width used for the comparator of the reception unit 30 from the setting information storage unit 28a.

  For example, when the antenna size of the resonance unit 24 is “smaller than class 1”, the IC card 20 reads “ab” as the hysteresis width used for the comparator of the reception unit 30 from the setting information storage unit 28a. .

  As described above, the IC card 20 operates the comparator of the receiving unit 30 by automatic control within the adjustment range of the hysteresis width corresponding to the antenna size. Thereby, the IC card 20 can receive radio waves stably. The setting information storage unit 28a has been described as a configuration that stores an adjustable range as the hysteresis width, but is not limited to this configuration. The setting information storage unit 28a may be configured to store a fixed value to be adjusted as the hysteresis width.

  Further, as described above, when the antenna size is reduced, the load modulation level for the signal transmitted by the transmission unit 29 is reduced. For example, when the antenna size of the resonance unit 24 is “class 1 size”, it is assumed that the load modulation level at the time of transmission can be adjusted in the range of A to B.

  Further, for example, when the antenna size of the resonance unit 24 is “a size smaller than the class 1 size”, it is assumed that the load modulation level at the time of transmission can be adjusted in the range of C to D. In this case, the load modulation levels A, B, C, and D satisfy the relationship “A <B ≦ C <D”. Note that B and C may be reversed, that is, “B> C”.

  As described above, the IC card 20 operates the transmission unit 29 by automatic control within the adjustment range of the load modulation level at the time of transmission according to the antenna size. Thereby, the IC card 20 can transmit radio waves stably. Although the setting information storage unit 28a has been described as a configuration that stores an adjustable range as a load modulation level, the configuration is not limited to this configuration. The setting information storage unit 28a may be configured to store a fixed value to be adjusted as a load modulation level.

  The IC card 20 can achieve impedance matching with the terminal device 10 by adjusting the resonance frequency and / or Q of the resonance unit 24 and the impedance matching unit 33. That is, the IC card 20 can change the setting of the transmission / reception characteristics by performing impedance matching by the impedance matching unit 33 according to the parameter read from the setting information storage unit 28a.

  FIG. 6 is an explanatory diagram for explaining the operation of the IC card shown in FIG. FIG. 6 shows a method for setting transmission / reception characteristics according to the antenna size.

  Usually, when the IC module 22 is issued, an antenna (standard antenna) having a standard wire diameter, a distance between wires, and the number of turns is connected to the IC chip 23, and setting processing of transmission / reception characteristics is performed on the IC chip 23 by wireless communication. Let it be done. For this reason, the non-volatile memory 28 of the IC chip 23 is set with transmission / reception characteristics that operate stably by the standard antenna (step S11). The setting information shown in FIG. 5 is stored in advance in the nonvolatile memory 28 of the IC chip.

  A standard antenna is connected to the IC chip 23 (step S12). In this case, the standard antenna is connected to the antenna connection terminal of the IC chip 23 by, for example, a method of pressing a pin (terminal). In other words, the standard antenna is connected in an easily removable state.

  A command for setting transmission / reception characteristics corresponding to an antenna (final antenna) used for operation is input by the terminal device 10 to the IC chip 23 to which the standard antenna is connected. The command for setting the transmission / reception characteristics includes information indicating the antenna size of the final antenna. The information indicating the antenna size is information indicating whether or not the antenna size of the final antenna is less than “class1 size”, for example.

  The IC chip 23 sets transmission / reception characteristics by storing information indicating the antenna size in the nonvolatile memory 28 (step S13). The CPU 25 of the IC chip 23 reads parameters from the setting information storage unit 28a according to information indicating the antenna size stored in the nonvolatile memory 28.

  When the transmission / reception characteristics are set, the standard antenna is removed from the antenna connection terminal of the IC chip 23. Then, the final antenna is connected to the antenna connection terminal of the IC chip 23 (step S14). Thereby, the IC module 22 is formed.

  FIG. 7 is an explanatory diagram for explaining the operation of the IC card shown in FIG. FIG. 7 shows a method for setting transmission / reception characteristics according to the antenna size.

  In the example of FIG. 6, the command for setting the transmission / reception characteristics has been described as having information indicating the antenna size of the final antenna. However, the IC chip 23 may be configured to determine the antenna size.

  In this case, transmission / reception characteristics that can correspond to various antennas are set in the nonvolatile memory 28 of the IC chip 23 (step S21). For example, the non-volatile memory 28 of the IC chip 23 is set with transmission / reception characteristics corresponding to an average antenna derived from a plurality of types of antennas that may be connected. The setting information shown in FIG. 5 is stored in advance in the nonvolatile memory 28 of the IC chip.

  The final antenna is connected to the IC chip 23 (step 22). For example, the IC chip 23 determines the antenna size of the final antenna according to the level of power generated by the power supply unit 31 from the radio wave received by the final antenna (step S23). That is, the IC chip 23 determines that the antenna size of the final antenna is “a size larger than class 1” when the power supply unit 31 detects a voltage equal to or higher than a preset threshold value. Further, the IC chip 23 determines that the antenna size of the final antenna is “a size smaller than class 1” when the power supply unit 31 detects a voltage less than a preset threshold value.

  The IC chip 23 sets the transmission / reception characteristics by storing the determination result in the nonvolatile memory 28 (step S23). The CPU 25 of the IC chip 23 reads parameters from the setting information storage unit 28a according to information indicating the antenna size stored in the nonvolatile memory 28. Thereby, the IC module 22 is formed.

  In this case, for example, by setting a flag for determining whether or not the information indicating the antenna size stored in the nonvolatile memory 28 can be changed in the nonvolatile memory 28, it is possible to prevent the transmission / reception characteristics from being changed. .

  FIG. 8 is an explanatory diagram for explaining the operation of the IC card shown in FIG. In FIG. 8, a process for replacing the antenna of the already issued IC module 22 will be described.

  When the antenna connected to the IC chip 23 is changed, it may be necessary to change the setting of the transmission / reception characteristics. However, if the transmission / reception characteristics can be easily changed, the operation may be disabled. Therefore, for example, the IC card 20 may be configured to be able to reset transmission / reception characteristics after mutual authentication is performed between the card reader / writer 14 of the terminal device 10 and the IC card 20.

  For example, it is assumed that mutual authentication is performed by receiving a mutual authentication command from the terminal device 10 (step S31). When the mutual authentication is normally completed, the IC chip 23 cancels the flag that restricts the change of the transmission / reception characteristics stored in the nonvolatile memory 28. Thereby, the non-volatile memory 28 of the IC chip 23 is in a state in which the transmission / reception characteristics can be changed as in the issue.

  Here, the antenna is removed from the antenna connection terminal of the IC chip 23, and a new antenna is connected to the antenna connection terminal of the IC chip 23 (step S32).

  In this case, the IC chip 23 sets transmission / reception characteristics according to the newly connected antenna by the process shown in FIG. 6 or the process shown in FIG. 7 (step S33). Further, the IC chip 23 sets again a flag for restricting the change of the transmission / reception characteristics. As a result, an IC card that can change transmission / reception characteristics more flexibly can be realized.

  As described above, the IC card 20 according to the present embodiment stores parameters for each antenna size in advance, reads the parameters according to the antenna size of the resonance unit 24 connected to the IC chip 23, and sets transmission / reception characteristics. . This eliminates the need to manufacture IC chips individually for each antenna size. As a result, it is possible to provide a portable electronic device, a portable electronic device processing system, and a portable electronic device processing method that are inexpensive and can be connected to a plurality of antennas having different shapes.

  In the example described above, the IC card has been described as a configuration that permits a change in transmission / reception characteristics when mutual authentication is normally completed. However, the configuration is not limited to this configuration. For example, the IC card may be configured to allow a change in transmission / reception characteristics when receiving a special command. The special command is, for example, a command having a special frame format or a command having special authentication information.

  In the above-described embodiment, the parameter is selected according to whether the antenna size is “class1” or more. However, the present invention is not limited to this configuration. There may be any number of antenna size categories. In this case, the setting information storage unit 28a stores parameters for each antenna size category.

  In addition, this invention is not limited to the said embodiment as it is, It can implement by changing a component in the range which does not deviate from the summary in an implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

  DESCRIPTION OF SYMBOLS 1 ... IC card processing system, 10 ... Terminal device, 11 ... Control part, 12 ... Display, 13 ... Keyboard, 14 ... Card reader / writer, 15 ... Memory | storage part, 20 ... IC card, 21 ... Main body, 22 ... IC module, DESCRIPTION OF SYMBOLS 23 ... IC chip, 24 ... Resonance part, 25 ... CPU, 26 ... ROM, 27 ... RAM, 28 ... Non-volatile memory, 28a ... Setting information storage part, 29 ... Transmission part, 30 ... Reception part, 31 ... Power supply part, 32: Logic unit, 33: Impedance matching unit.

Claims (10)

A portable electronic device capable of mounting a resonance unit that generates an electrical signal in response to radio waves output from an external device,
A transmission / reception unit that performs signal processing of an electrical signal generated by the resonance unit;
A setting information storage unit that stores parameters for each antenna size of the resonance unit;
An antenna size storage unit for storing information indicating the antenna size of the resonance unit;
From the setting information storage unit, a parameter corresponding to information indicating the antenna size stored in the antenna size storage unit is read, and a transmission / reception characteristic control unit that controls transmission / reception characteristics of the transmission / reception unit based on the read parameter;
A portable electronic device comprising:   The portable electronic device according to claim 1, wherein the antenna size storage unit stores information indicating an antenna size received from the external device.   The portable electronic device according to claim 1, wherein the antenna size storage unit specifies an antenna size according to an intensity of an electric signal generated by the resonance unit, and stores information indicating the specified antenna size.   The setting information storage unit is one of impedance matching, load modulation level, hysteresis width of the comparator of the transmission / reception unit, filter characteristic, voltage value of the shunt regulator after the rectifier circuit, and voltage-current characteristic for each antenna size. The portable electronic device according to claim 1, wherein a plurality of parameters are stored.   The portable electronic device according to claim 1, wherein the antenna size storage unit further stores flag information that restricts updating of information indicating the stored antenna size.   The portable electronic device according to claim 5, wherein the antenna size storage unit cancels the flag information when mutual authentication is normally performed with the external device.   The portable electronic device according to claim 5, wherein the antenna size storage unit cancels the flag information when receiving a predetermined command set in advance from the external device. Furthermore, an IC module comprising each of the parts and the resonance part,
A main body on which the IC module is installed;
The portable electronic device according to claim 1, comprising: A processing system for a portable electronic device, comprising: a processing device that processes the portable electronic device; and a portable electronic device that can be equipped with a resonance unit that generates an electrical signal in response to radio waves output from the processing device. ,
The processor is
A first transmission / reception unit that communicates with the portable electronic device by radio waves;
A command processing unit configured to transmit a command having information indicating an antenna size to the portable electronic device by the first transmission / reception unit;
Comprising
The portable electronic device comprises:
A second transmission / reception unit that performs signal processing of an electrical signal generated by the resonance unit;
A setting information storage unit that stores parameters for each antenna size of the resonance unit in advance,
An antenna size storage unit for storing information indicating an antenna size included in a command transmitted from the processing device;
A transmission / reception characteristic control unit that reads out a parameter corresponding to the antenna size stored in the antenna size storage unit from the setting information storage unit, and controls transmission / reception characteristics of the second transmission / reception unit based on the read parameter;
A processing system for a portable electronic device comprising: A method for controlling a portable electronic device used in a portable electronic device capable of mounting a resonance unit that generates an electrical signal in response to radio waves output from an external device,
Perform signal processing of the electrical signal generated by the resonance unit,
Pre-store parameters for each antenna size of the resonance unit,
Storing information indicating the antenna size of the resonating unit;
Reading out the parameter corresponding to the information indicating the stored antenna size, and controlling the transmission / reception characteristics in the signal processing based on the read parameter,
Control method of portable electronic device.

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