JP2002183697A - Noncontact ic card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noncontact IC card having a convenient structure usable for communication, even with a host device of a different communication processing form by the same card. SOLUTION: This noncontact IC card has respectively two pieces of modulating circuits 2 and 3 of a different modulating method, demodulating circuits 4 and 5 of a different demodulating method, coding circuit 6 and 7 of a different coding method, and decoding circuits 8 and 9 of a different decoding method in an IC chip 1, and is formed as a type for coping with two kinds of application by storing a switching control program in a read-only nonvolatile memory (ROM) 12 for controlling the respective circuits in a switching system, so as to conicide with the respective methods indicated in a specific command by a control circuit 10 at reception processing time of the specific command transmitted from the host device 14, and can be used for communication, even with a host device of a different communication processing form other than the host device 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type IC card having a non-contact interface by electromagnetic induction mainly used in systems in various fields, and more particularly, to a non-contact type IC card which communicates with a host device having a different communication processing form. The present invention relates to a non-contact type IC card capable of performing communication and capable of switching between a different modulation method and demodulation method and a different coding method and decoding method during communication.

[0002]

2. Description of the Related Art Conventionally, this type of non-contact type IC card has
A storage device for storing control information required for communication control with an external higher-level device and operation control of an internal device, a modulation circuit for modulating with a predetermined modulation method, and a demodulation circuit for demodulating with a predetermined demodulation method And, a coding circuit that performs coding by a predetermined coding method, a decoding circuit that performs decoding by a predetermined decoding method,
In addition to performing communication with the higher-level device based on the control information, at the time of communication, a modulation operation according to a predetermined modulation method by a modulation circuit, a demodulation operation according to a predetermined demodulation method by a demodulation circuit, a predetermined coding by a coding circuit are performed. A control circuit for controlling the coding operation according to the decoding method and the decoding operation according to the predetermined decoding method by the decoding circuit in at least an IC chip, and having a non-contact interface by electromagnetic induction. Made up of

[0003] Among them, a storage device (memory) may be a volatile memory (RAM), a read-only nonvolatile memory (ROM), a read / write nonvolatile memory (EEPROM), or the like according to control information to be stored. Selected and used.

In general, a non-contact type IC card having such a configuration is used in systems in various fields such as finance, point management, entry / exit management, and personal information management, and is used for communication with a host device. The modulation method and the demodulation method, the coding method and the decoding method correspond to the dedicated higher-level device, and have come to match the modulation method and the demodulation method included in a specific command transmitted from the higher-level device. I have.

[0005]

In the case of the above-mentioned conventional non-contact type IC card, there are one type of modulation system and demodulation system, and one coding system and decoding system employed for communication with a host device. It is configured so that communication can be used only for a dedicated upper-level device that performs communication with a higher-level device that employs another type of modulation scheme and demodulation scheme, and a coding scheme and a decoding scheme. In order to enable communication in such a case, a new non-contact type IC that matches the other types of modulation and demodulation, coding, and decoding adopted by the host device. Cards (with modulation, demodulation, coding, and decoding circuits for each system) must be created and used separately. Razz, there is a problem of inconvenience of not being able to communicate used between the host apparatus different communication processing mode in the same card.

That is, when an attempt is made to use a non-contact type IC card used in an application such as a point management system in an application other than the point management system, the modulation / demodulation method of the higher-level device is adopted in the card. Since the method is different, the card cannot be used in the application. Therefore, in such a case, a plurality of cards corresponding to each application are required separately from the card currently used by the user.

Therefore, at present, when performing communication with a host device having a different communication processing mode, a user needs a non-contact type IC card having a built-in IC chip of a different structure created for each application. Since it is necessary to possess and use a card corresponding to the application, it is expensive for the user to own multiple cards, and in addition, it is necessary to select the corresponding application from multiple cards Another problem is that it is not possible to promptly provide services to the user due to the time and labor required for the operation.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and its technical problem is that the same card can be conveniently used for communication with a host device having a different communication processing form. A non-contact type IC card is provided.

[0009]

According to the present invention, there is provided a storage device for storing control information required for communication control with an external upper-level device and operation control of an internal device, and a storage device for storing a predetermined modulation method. A modulation circuit that performs modulation, a demodulation circuit that demodulates in a predetermined demodulation method, and performs communication with a higher-level device based on control information, and performs a modulation operation and demodulation according to a predetermined modulation method by the modulation circuit during the communication. A non-contact type IC card having at least an IC chip and a control circuit for controlling a demodulation operation in accordance with a predetermined demodulation method by a circuit, and having a non-contact interface by electromagnetic induction; The demodulation circuit is composed of a plurality of devices that can be demodulated by different demodulation methods, respectively, and the control circuit is a higher-level device. A modulation method included in the specific command, which is requested by the higher-level device, for a different modulation method by a plurality of modulation circuits and a different demodulation method by a plurality of demodulation circuits during reception processing of a specific command to be transmitted. A non-contact type IC card is selected which is selected so as to match the demodulation method and controls the modulation operation according to the modulation method of the selected and selected modulation circuit and the demodulation operation according to the demodulation method of the demodulation circuit. Can be

According to the present invention, in the contactless IC card, the control information includes a plurality of coding programs for performing coding in different coding schemes and a plurality of coding programs for performing decoding in different decoding schemes. A plurality of decoding programs, and the control circuit requests the host device to perform a different coding method using a plurality of coding programs and a different decoding method using a plurality of decoding programs when receiving a specific command. And a coding operation and a decoding program according to the coding method of the selected and selected coding program, in accordance with the coding method and the decoding method included in the specific command. Contactless IC card for controlling the decoding operation according to the decoding scheme of beam is obtained.

Further, according to the present invention, the above-mentioned non-contact type IC
In the card, a plurality of coding circuits for performing coding with different coding schemes and a plurality of decoding circuits for performing decoding with different decoding schemes are provided in an IC chip.
The control circuit is included in the specific command requested by the higher-level device for a different coding scheme using a plurality of coding circuits and a different decoding scheme using a plurality of decoding circuits when receiving a specific command. In addition to selecting and selecting the coding method and the decoding method so as to match, the coding operation according to the coding method of the selected and selected coding circuit and the control of the decoding operation according to the decoding method of the decoding circuit are performed. Non-contact type I
C card is obtained.

In addition, according to the present invention, in any of the above non-contact type IC cards, the control circuit specifies a different modulation method by a plurality of modulation circuits and a different modulation method by a plurality of demodulation circuits. , A plurality of coding programs and a plurality of decoding circuits and a plurality of decoding programs or a plurality of decoding programs after selecting and selecting one by one so as to match the modulation method and the demodulation method included in the command. When selecting and selecting different decoding schemes by a circuit so as to match the coding scheme and the decoding scheme included in the specific command, respectively, one by one each of the modulation circuit and the demodulation circuit. A corresponding non-contact type IC card is obtained.

On the other hand, according to the present invention, in any one of the above non-contact type IC cards, the control circuit specifies a different modulation method using a plurality of modulation circuits and a different modulation method using a plurality of demodulation circuits. Contactless IC card using a communication protocol corresponding to the selected modulation and demodulation method on a one-to-one basis, one by one, so as to match the modulation and demodulation methods included in the command. Is obtained.

[0014] On the other hand, according to the present invention, in any one of the above non-contact type IC cards, the control information is obtained by a different modulation method using a plurality of modulation circuits and a plurality of demodulation circuits during reception processing of a specific command. A switching control program for selecting and selecting different demodulation methods so as to match the modulation method and the demodulation method included in the specific command requested by the higher-level device, respectively, and performing a switching process, As the circuit, a non-contact type IC card including a central processing unit that performs control in accordance with a switching control program is obtained.

Further, according to the present invention, in any one of the above-mentioned non-contact type IC cards, the control circuit is configured to use a different modulation method using a plurality of modulation circuits and a plurality of demodulation circuits when receiving a specific command. A non-contact type IC comprising a logic circuit for performing a switching process of selecting and selecting different demodulation methods so as to match the modulation method and the demodulation method included in the specific command requested by the higher-level device.
You get a card.

Further, according to the present invention, in any of the above non-contact type IC cards, the storage device is a volatile memory,
A non-contact type IC card including a read-only nonvolatile memory and a read-write nonvolatile memory can be obtained.

In addition, according to the present invention, the non-contact type I
In the C card, the read-only nonvolatile memory stores a switching control program, and the read-write nonvolatile memory stores the communication protocol corresponding to the modulation scheme and the demodulation scheme selected and selected according to the switching control program. Non-contact type IC that stores connection information
You get a card.

On the other hand, according to the present invention, in any of the above-mentioned non-contact type IC cards, the readable and writable nonvolatile memory is a non-contact type IC card used as a read-only memory which can be electrically written and erased. Is obtained.

On the other hand, according to the present invention, in any of the above non-contact type IC cards, the readable / writable nonvolatile memory is a non-contact type non-volatile memory which is a ferroelectric nonvolatile memory.
C card is obtained.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The non-contact type IC card of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a functional block diagram showing a basic configuration of a non-contact type IC card according to one embodiment of the present invention.
This non-contact type IC card has a storage device for storing control information required for communication control with an external host device 14 and operation control of an internal device, and a modulation of a transmission signal to be transmitted to the host device 14. Two modulation circuits 2 and 3 for performing modulation using different modulation schemes, two demodulation circuits 4 and 5 for performing demodulation of a received signal received from the host device 14 using different demodulation schemes, and two modulation schemes. Prior to modulation, two coding circuits 6 and 7 for coding transmission signals using different coding schemes, and two decoding circuits for decoding received signals after demodulation using two types of demodulation schemes using different decoding schemes. The host device 14 based on the coding circuits 8 and 9 and the control information of the storage device.
And communicate with the host device 14 at the time of communication.
During the reception processing of a specific command to be transmitted, a different modulation method by each of the modulation circuits 2 and 3, a different demodulation method by each of the demodulation circuits 4 and 5, a different coding method by each of the coding circuits 6 and 7, and each of the decoding circuits 8 and 9
And a modulation method selected and selected so as to match a modulation method and a demodulation method and a coding method and a decoding method included in a specific command requested by the higher-level device 14, respectively. The control of the modulation operation according to the modulation method of the circuit and the demodulation operation according to the demodulation method of the demodulation circuit, the control of the coding operation according to the coding method of the coding circuit, and the control of the decoding operation according to the decoding method of the decoding circuit. The control circuit 10 is provided in the IC chip 1 and has a non-contact interface (not shown) by electromagnetic induction.

Here, as the control information of the storage device, the host device 14 requests each of the modulation circuits 2 and 3 and each of the demodulation circuits 4 and 5 and each of the coding circuits 6 and 7 and each of the decoding circuits 8 and 9. The control circuit 10 includes a switching control program for selectively selecting and performing a switching process according to a modulation method and a demodulation method and a coding method and a decoding method included in a specific command being executed. It comprises a central processing unit (CPU) so that control processing can be executed according to the switching control program.

That is, according to the switching control program, the control circuit 10 sets a different modulation scheme for each of the modulation circuits 2 and 3 and a different demodulation scheme for each of the demodulation circuits 4 and 5 in a modulation command and a demodulation scheme included in a specific command. Are selected and selected one by one so as to match the coding scheme, and the different coding schemes by the respective coding circuits 6 and 7 and the different decoding schemes by the respective decoding circuits 8 and 9 are respectively included in a specific command and a decoding scheme included in a specific command. At the time of selection and selection so as to match the system, one modulation circuit and one demodulation circuit are selected one by one, respectively. At this time, the control circuit 10 performs communication with the higher-level device 14 using a communication protocol corresponding to the selected and selected modulation method and demodulation method on a one-to-one basis. Thereby, referring to the functional block diagram shown in FIG. 1, the signal system related to the coding circuit 6 and the modulation circuit 2 and the demodulation circuit 4 and the decoding circuit 8 or the coding circuit 7 and the modulation circuit 3 and the demodulation circuit 5 and One of the signal systems related to the decoding circuit 9 is selected and selected.

The storage device is a volatile memory (RAM) 1 for storing simple information relating to data processing of transmission signals and reception signals mainly communicated with the host device 14.
1, a read-only non-volatile memory (ROM) 12 storing a switching control program for controlling switching between a modulation method and a demodulation method, which can be electrically written and erased and selected by the switching control program A read / write nonvolatile memory 13 used as a read-only memory (EEPROM) for storing connection information after a communication protocol corresponding to the selected modulation scheme and demodulation scheme is determined. Among them, the switching control program stored in the read-only nonvolatile memory (ROM) 12 includes a modulation circuit and a demodulation scheme that match the modulation scheme requested by the higher-level device 14 during reception processing of a specific command transmitted from the higher-level device 14. And a demodulation circuit corresponding to each of the modulation circuits 2, 3 provided in the IC chip 1.
And the demodulation circuits 4 and 5 are selected and selected. The coding circuit and the decoding circuit corresponding to the modulation circuit of the selected and selected modulation method and the demodulation circuit of the demodulation method on a one-to-one basis are selected and selected. Perform the switching process.

In short, in the case of this non-contact type IC card, two modulation circuits 2 and 3 of different modulation schemes and two demodulation circuits 4 and 5 of different demodulation schemes are provided in the IC chip 2 respectively.
And coding circuits 6 and 7 of different coding schemes
And decoding circuits 8 and 9 of different decoding schemes. In addition, during reception processing of a specific command transmitted from the higher-level device 14, the control circuit 10 controls each of them so as to match each scheme indicated by the specific command. A read-only nonvolatile memory (ROM), which is a storage device for storing a switching control program for performing switching control of a circuit.
Since it is stored in the storage device 12 and is of a type corresponding to two types of applications, it can be used for communication with another host device of a different communication processing mode (type corresponding to another application) other than the host device 14. It has a convenient structure that can be used.

FIG. 2 is a flowchart showing an operation procedure when the control circuit 10 of the non-contact type IC card receives and processes a specific command transmitted from the external host device 14.

Here, an arbitrary command transmitted by the host device 14 is received by the non-contact type IC card and the IC chip 1
The command processing is performed by the control circuit 10 in the
When the command transmitted from the IC chip 1 is a specific command, each of the modulation circuits 2 and 3 provided in the IC chip 1 includes a modulation circuit and a demodulation circuit that match the modulation method and the demodulation method required by the host device 14. The communication connection (continuation) is performed by selecting and selecting from the demodulation circuits 4 and 5 and controlling the switching between the modulation method and the demodulation method by using the modulation and demodulation method and the communication protocol that match the host device 14. .

More specifically, first, when a non-contact type IC card is usable in an initial state and power is supplied from the host device 14, the control circuit 10 reads out from two types of modulation / demodulation methods. The connection information stored in the writable nonvolatile memory 13 [the communication protocol corresponding to the modulation scheme and demodulation scheme selected and selected according to the switching control program stored in the read-only nonvolatile memory (ROM) 12 at the time of last use. After setting the modulation method and the demodulation method with reference to FIG. 1 and performing an operation of waiting for reception of an arbitrary command transmitted from the higher-level device 14, it is determined whether or not the higher-level command has been received (Step S).
Perform 1). As a result, if the upper command has not been received, the control circuit 10 returns the operation processing to the operation start and waits, but if the upper command has been received, the command message format and the parameter value for any command are received. , And a command message check for checking the command message length (step S2), and then determine whether or not the command message is normal (step S3). If it is determined that the command message is normal (step S3), and the command message is not normal and there is a message error in an arbitrary command, the control circuit 10 returns the operation processing to the operation start and waits. Transitions to the command reception waiting operation again, but if the command telegram is normal, then it is determined whether or not any command is a specific command requesting switching control between the modulation method and the demodulation method (step S4). I do.

Next, as a result of the determination as to whether or not the command is a specific command (step S4), if the command is not a specific command, the control circuit 10 performs other command processing (step S4).
9), after communicating with the host device 14 in the selected method (step S8), the operation processing is terminated. If the command is a specific command, the read-only nonvolatile memory (RO)
M) Each of the modulation circuits 2 and 3 provided in the IC chip 1 with a modulation circuit and a demodulation circuit that match the modulation method and the demodulation method required by the higher-level device 14 according to the switching control program stored in 12. After performing the modulation / demodulation method selection (step S5) by selecting and selecting from the demodulation circuits 4 and 5, the coding method and the decoding method corresponding to the selected and selected modulation method and demodulation method on a one-to-one basis. And a decoding circuit having
Coding circuits 6 and 7 provided in C chip 1
And selecting each of the decoding circuits 8 and 9 to perform a coding scheme selection (step S6), and then select and select a communication protocol corresponding to the selected modulation scheme and demodulation scheme on a one-to-one basis. The communication protocol selection (step S7) is performed.

As a result, the modulation method, demodulation method, coding method, decoding method, and communication protocol are selected and selected, and communication with the higher-level device is performed in the selected method (step S8), and then operation processing is performed. To end.

FIG. 3 is a flowchart showing an operation procedure when the control circuit 10 in the configuration in which the non-contact type IC card is partially changed controls the switching between the modulation system and the demodulation system.

Here, a modulation circuit, a demodulation system, a coding system, a decoding system, and a communication circuit are used so that three types of modulation system, demodulation system, coding system, decoding system, and communication protocol can be adopted.
In addition to the configuration including three demodulation circuits, three coding circuits, and three decoding circuits, a specific command transmitted by the host device 14 is transmitted to the control circuit 10 in the IC chip 1.
2 shows in detail the procedure for performing operation processing according to the switching control program stored in the read-only nonvolatile memory (ROM) 12.

Specifically, first, the control circuit 10
After the specific command is received, the modulation method and the demodulation method are acquired by referring to the connection information stored in the readable and writable nonvolatile memory 13 to perform the process of referring to the in-memory setting (step S1), and then read out. The modulation / demodulation method switching is performed by checking whether the modulation method and the demodulation method stored in the writable nonvolatile memory 13 are different from the modulation method and the demodulation method requested by the higher-level device 14 by a specific command. It is determined whether or not it is necessary (step S2).

As a result, the modulation method and the demodulation method stored in the readable / writable nonvolatile memory 13 are the same as the modulation method and the demodulation method requested from the higher-level device 14 by the specific command, and Device 14
If the modulation / demodulation method requested by the user does not require the modulation / demodulation method switching, the normal processing is transmitted to the host device 14 (step S16), and then the operation processing is terminated. If the modulation method and the demodulation method used are different from the modulation method and the demodulation method requested by the higher-order device 14 by the specific command, and the modulation and demodulation method requested by the higher-order device 14 requires the modulation / demodulation method switching. It is determined whether or not the modulation and demodulation method 1 is used (step S3).

It is determined whether or not the modulation / demodulation method 1 is used (step S3).
0 denotes a modulation circuit and a demodulation circuit that match the modulation and demodulation method 1 in the IC chip 1 according to the switching control program stored in the read-only nonvolatile memory (ROM) 12. After performing the processing of the modulation / demodulation method 1 selection (step S4) for selecting the modulation / demodulation method 1 by selecting and selecting from among them, the coding method 1 and the decoding method 1 corresponding to the selected and selected modulation / demodulation method 1 on a one-to-one basis. The coding method 1 and the decoding method 1 are selected by selecting and selecting a coding circuit and a decoding circuit having the following from the respective coding circuits and the respective decoding circuits provided in the IC chip 1.
The communication protocol 1 selects and selects the communication protocol 1 corresponding to the selected modulation and demodulation method 1 on a one-to-one basis after performing the processing of the coding method 1 selection (step S5).
The selection (step S6) is performed.

On the other hand, as a result of determining whether or not the modulation / demodulation method 1 is used (step S3), if the modulation / demodulation method 1 is not used,
Subsequently, it is determined whether or not the modulation / demodulation method 2 is used (step S7). As a result, in the case of the modulation / demodulation method 2, the control circuit 10 includes in the IC chip 1 a modulation circuit and a demodulation circuit that match the modulation / demodulation method 2 in accordance with the switching control program stored in the read-only nonvolatile memory (ROM) 12. After performing the processing of the modulation and demodulation method 2 selection (step S8) of selecting the modulation and demodulation method 2 by selecting and selecting from the modulation circuits and the demodulation circuits which are being performed, the modulation and demodulation method 2 selected and selected is one-to-one. The coding scheme is selected by selecting a coding circuit and a decoding circuit having the corresponding coding scheme 2 and decoding scheme 2 from each coding circuit and each decoding circuit provided in the IC chip 1. 2 and the decoding method 2 to select the decoding method 2 (step S
After performing the process of 9), one-to-one
The communication protocol 2 selection (step S10) for selecting and selecting the corresponding communication protocol 2 is performed. However, since it is not the modulation and demodulation method 1 unless it is the modulation and demodulation method 2, it is regarded as the modulation and demodulation method 3, and the control circuit 10 similarly reads According to the switching control program stored in the dedicated non-volatile memory (ROM) 12, a modulation circuit and a demodulation circuit matching the modulation / demodulation method 3 are selected from each modulation circuit and each demodulation circuit provided in the IC chip 1. Modulation and demodulation method 3 by selecting
After performing the process of selecting the modulation and demodulation method 3 (step S11), the coding circuit and the decoding circuit having the coding method 3 and the decoding method 3 corresponding to the selected and selected modulation and demodulation method 3 on a one-to-one basis are used. By selecting and selecting from each of the coding circuits and each of the decoding circuits provided in the IC chip 1, a coding method 3 and a coding method 3 selection (step S12) for selecting the decoding method 3 are performed. Communication protocol 3 selection (step S)
Step 13) is performed.

In the process up to this point, the modulation and demodulation methods 1 to
3, coding method 1-3, decoding method 1
3. Since any one of the communication protocols 1 to 3 is selected and selected, the control circuit 10 thereafter changes the connection information of the read / write nonvolatile memory 13 to the connection information corresponding to each method selected here. After the process of storing and holding the information in the memory so that the information is updated and held (step S14), the process of switching the operation setting of each unit in the IC chip 1 to the selected method is performed (step S15). After that, a normal end response is transmitted to the host device 14 (step S16), and then the operation processing is ended.

Incidentally, the non-contact type IC according to the above-described embodiment.
In the card, two modulation circuits 2, 3, demodulation circuits 4, 5, coding circuits 6,
7 and decoding circuits 8 and 9 are provided to select and select two types of modulation schemes, demodulation schemes, coding schemes, and decoding schemes, respectively. Or four or more modulation schemes, demodulation schemes, coding schemes,
It is also possible to adopt a configuration in which three or four or more components are provided so as to switch and select the decoding method.

In the non-contact type IC card of one embodiment,
Coding circuits 6 and 7, and decoding circuits 8,
9, but a plurality of coding programs for performing coding in different coding schemes and a plurality of decoding programs for performing decoding in different decoding schemes are stored as control information of the storage device. When the control circuit 10 receives a specific command, the coding included in the specific command requested by the higher-level device 10 requires a different coding scheme according to each coding program and a different decoding scheme according to each decoding program. In addition to selecting and selecting to match the decoding method and the decoding method, the coding operation according to the coding method of the selected and selected coding program and the decoding method of the decoding program If on the demodulation scheme modulation method selected selected similarly control the decoding operation Tsu as carried out by a one-to-one correspondence, it is possible to dispense with the coding circuit and decoding circuit.

Further, in the non-contact type IC card of one embodiment, the read / write nonvolatile memory 13 is a read-only memory (EEP) which can be electrically written and erased.
ROM), but this can be replaced with a ferroelectric nonvolatile memory.

In addition, in the non-contact type IC card of one embodiment, a specific command transmitted from the higher-level device 14 is received and processed in the read-only nonvolatile memory (ROM) 12 to determine the modulation method and the demodulation method. Although the switching control program for performing the switching control is stored, this switching control program is a read-only nonvolatile memory (RO).
M) 12 can be stored in a volatile memory (RAM) 11 or a readable / writable nonvolatile memory 13, and a central processing unit (CPU) capable of switching a control circuit 10 and processing a control program can be stored. ) Instead of a specific command, the modulation method and the demodulation method included in the specific command requested by the higher-level device 14 for a different modulation method by each modulation circuit and a different demodulation method by each demodulation circuit during reception processing of the specific command. May be configured as a logic circuit that performs a switching process of selecting and selecting so as to match.

[0042]

As described above, according to the non-contact type IC card of the present invention, a plurality of modulation schemes, demodulation schemes, coding schemes, decoding schemes, and communication protocols used for communication with a host device are provided. In the IC chip, a plurality of modulation circuits of different modulation schemes, demodulation circuits of different demodulation schemes, coding circuits of different coding schemes, and decoding circuits of different decoding schemes are provided so as to be selectively controllable as different ones. Each modulation circuit, each demodulation circuit, each coding circuit, and each decoding circuit are incorporated so that the control circuit matches each system included in the specific command when receiving a specific command transmitted from the host device. By selecting and selecting, it is a convenient structure of a type corresponding to various types of applications. Because there is also becomes possible to communicate used between the host apparatus different communication processing mode on the same card. As a result, the card user does not need to have a plurality of cards corresponding to different upper-level devices for each application as in the related art, and can use a plurality of applications with one card. Will be able to provide services quickly,
Various burdens associated with card changes such as creation and issuance of a new card or distribution work are also reduced for the card issuer.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a basic configuration of a non-contact type IC card according to one embodiment of the present invention.

FIG. 2 is a flowchart showing an operation procedure when the control circuit in the non-contact type IC card shown in FIG. 1 performs reception processing of a specific command transmitted from an external host device.

FIG. 3 is a flowchart showing an operation procedure when switching control between a modulation method and a demodulation method is performed by a control circuit in a configuration in which the non-contact type IC card shown in FIG. 1 is partially changed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 IC chip 2, 3 Modulation circuit 4, 5 Demodulation circuit 6, 7 Coding circuit 8, 9 Decoding circuit 10 Control circuit 11 Volatile memory (RAM) 12 Read only nonvolatile memory (ROM) 13 Read / write nonvolatile memory 14 Host device

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshihisa Inabe 7-1, Koriyama, Koriyama, Taihaku-ku, Sendai, Miyagi Prefecture Tokinnai Co., Ltd. (72) Inventor ▲ Tsuru ▼ Koji 2-3, Otemachi, Chiyoda-ku, Tokyo No. 1 Within Nippon Telegraph and Telephone Corporation (72) Yoshimitsu Otani, Inventor 2-3-1 Otemachi, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Yasuhiro Nagai, Otemachi 2 Chiyoda-ku, Tokyo Chome No.3-1 F-term in Nippon Telegraph and Telephone Corporation (reference) 2C005 MA33 MA40 NA09 SA05 SA30 5B035 AA06 BB09 CA11 CA23

Claims (11)

[Claims] 1. A storage device for storing control information required for communication control with an external host device and operation control of an internal device, a modulation circuit for modulating by a predetermined modulation method, and a predetermined demodulation method A demodulation circuit that demodulates the data, and performs communication between the host device based on the control information, and performs the modulation operation according to the predetermined modulation method by the modulation circuit and the predetermined operation by the demodulation circuit during the communication. In a non-contact type IC card comprising at least an IC chip and a control circuit for controlling a demodulation operation in accordance with a demodulation method and having a non-contact interface by electromagnetic induction, the modulation circuits are different from each other. The demodulation circuit comprises a plurality of devices capable of demodulation by different demodulation systems, and the control circuit comprises The higher level device requests the different modulation schemes by the plurality of modulation circuits and the different demodulation schemes by the plurality of demodulation circuits at the time of receiving a specific command transmitted from the higher level device. In addition to selecting and selecting a modulation method and a demodulation method included in the command, control is performed on a modulation operation according to the modulation method of the selected and selected modulation circuit and a demodulation operation according to the demodulation method of the demodulation circuit. Non-contact type IC card characterized by the above-mentioned. 2. The non-contact type IC card according to claim 1, wherein the control information includes a plurality of coding programs for performing coding in different coding schemes and a plurality of coding programs for performing decoding in different decoding schemes. The control circuit, the control circuit, when receiving the specific command, the different coding scheme by the plurality of coding programs and the different decoding scheme by the plurality of decoding programs, respectively, In addition to selecting and selecting the coding method and the decoding method included in the specific command requested by the higher-level device, the coding operation and the decoding according to the coding method of the selected and selected coding program are performed. A non-contact type IC card which controls a decoding operation according to a decoding method of a coding program. 3. The non-contact type IC card according to claim 1, wherein a plurality of coding circuits for performing coding in different coding schemes and a plurality of decoding circuits for performing decoding in different decoding schemes are provided. The control circuit, which is provided in the IC chip, performs the different coding schemes by the plurality of coding circuits and the different decoding schemes by the plurality of decoding circuits at the time of receiving the specific command. A coding operation and a decoding circuit according to the coding method of the selected and selected coding circuit, while selecting and selecting the coding method and the decoding method included in the specific command requested by the host device. How to decode A non-contact type IC card which controls a decoding operation according to a formula. 4. The non-contact IC card according to claim 2, wherein the control circuit controls the different modulation schemes by the plurality of modulation circuits and the different demodulation schemes by the plurality of demodulation circuits, respectively. After selecting and selecting one by one so as to match the modulation method and the demodulation method included in the specific command, the different coding methods and the plurality of data by the plurality of coding programs or the plurality of coding circuits are selected. When selecting and selecting a coding program or the different decoding schemes by the plurality of decoding circuits so as to match the coding scheme and the decoding scheme included in the specific command, respectively. The modulation circuit and the demodulation circuit correspond to each other on a one-to-one basis. Contactless IC card. 5. The non-contact type IC card according to claim 1, wherein the control circuit is configured to control the different modulation schemes by the plurality of modulation circuits and the plurality of demodulation circuits by the plurality of demodulation circuits. Different demodulation schemes are selected and selected one by one so as to match the modulation scheme and the demodulation scheme included in the specific command, and the selected modulation scheme and the demodulation scheme correspond one-to-one. A non-contact type IC card characterized by using a communication protocol. 6. The non-contact type IC card according to claim 1, wherein the control information is set to a different one of the plurality of modulation circuits by the plurality of modulation circuits during reception processing of the specific command. For performing the switching process by selectively selecting the different demodulation methods by the plurality of demodulation circuits so as to match the modulation method and the demodulation method included in the specific command requested by the higher-level device. A switching control program, wherein the control circuit comprises:
A non-contact type IC card comprising a central processing unit for performing control according to the switching control program. 7. The non-contact type IC card according to claim 1, wherein the control circuit is configured to execute the different modulation method by the plurality of modulation circuits when receiving the specific command. A logic circuit that performs a switching process of selecting and selecting the different demodulation methods by the plurality of demodulation circuits so as to match the modulation method and the demodulation method included in the specific command requested by the higher-level device. A non-contact type IC card, comprising: 8. The non-contact type IC card according to claim 6, wherein the storage device comprises a volatile memory, a read-only nonvolatile memory, and a read / write nonvolatile memory. Non-contact type IC card. 9. The non-contact type IC card according to claim 8, wherein the read-only nonvolatile memory stores the switching control program, and the read / write nonvolatile memory stores the switching control program according to the switching control program. A contactless IC card storing connection information after a communication protocol corresponding to a selected and selected modulation method and demodulation method is determined. 10. The non-contact type IC card according to claim 8, wherein the read / write nonvolatile memory is electrically writable and erasable,
A non-contact type IC card used as a read-only memory. 11. The non-contact IC card according to claim 8, wherein the readable / writable nonvolatile memory is a ferroelectric nonvolatile memory.