JPH09231331A - IC card - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide an IC card capable of easily setting / changing its communication condition by a command after issuing the IC card. In an IC card having storage means for storing condition information regarding communication conditions and communicating with an external device in accordance with the condition information, the storage means is a rewritable storage means, and contents of the condition information. Can be changed by an external command.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC card capable of setting / changing a communication condition with a reader / writer device or the like by giving a command after the IC card is issued.

[0002]

2. Description of the Related Art A conventional IC card includes a CPU, a RAM,
It has a ROM, an EEPROM, etc., communicates with the reader / writer device via the I / O terminal, receives a command, interprets and executes the command. In this case,
The command is JIS X 630 as a common command.
The one specified in 6 is used.

Further, when the IC card communicates with the outside, the IC card performs the communication according to a predetermined communication condition predetermined in the IC card system to which the IC card belongs (hereinafter simply referred to as "system"). Here, the communication conditions include, for example, a signal transmission speed, a stop bit length,
The contents of the initial response (ATR).

Conventionally, one IC card has been used only in one system, so that the IC card has only one communication condition. Therefore, the communication conditions are stored in the ROM of the IC card together with the program that defines the operation of the IC card. When the IC card communicates with the reader / writer device, the CPU reads the communication conditions of the ROM and I was communicating according to the conditions.

[0005]

The IC card is highly evaluated for its high security and the like, and has recently been rapidly spreading to society. Further, with the spread of IC cards, there is an increasing demand for using one IC card in two or more different systems. On the other hand, each system often has different set communication conditions due to the purpose of the system and the difference in the hardware that constructs the system. In addition, even in the same system, the communication conditions may be changed by increasing the communication speed due to the introduction of new technology.

On the other hand, in the conventional IC card, since the communication condition is stored in the ROM, the setting cannot be changed later. Therefore, when it is desired to use one IC card in two or more different systems, it is necessary to unify the communication conditions on the system side.

However, the unification of communication conditions between systems is
There is a problem that a large amount of capital investment is required in some cases. Further, in the same system, when changing communication conditions, it is necessary to develop / manufacture a ROM storing new communication conditions and use it to reproduce / reissue an IC card. However, the development of new ROM
A large amount of money and time are required for production. For this reason, it is generally not easy to change the communication conditions of the system, and despite the great progress in related technologies,
There was a problem that the profit could not be introduced into the IC card system.

[0008] Therefore, an object of the present invention is to provide an IC card in which the communication conditions can be easily set and changed by a command after the IC card is issued.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the transmission condition, the transmission data, and the operation characteristic can be customized. According to a second aspect of the present invention, in an IC card that has storage means for storing condition information regarding communication conditions, and communicates with an external device according to the condition information, the storage means is
It is a rewritable storage means, and the content of the condition information can be changed by a command from the outside. According to a third aspect of the present invention, in the IC card according to the first or second aspect, the transmission condition or the condition information is information regarding a transmission speed.

The invention according to claim 4 is the IC card according to claim 1 or 2, wherein the transmission condition or the condition information is information relating to a stop bit. According to a fifth aspect of the present invention, in the IC card according to the first or second aspect, the transmission data or the condition information is initial response information regarding a part or all of the content of the initial response file. And The invention according to claim 6 is the I according to claim 1 or claim 2.
In the C card, the operation characteristic or the condition information is
It is characterized in that it is information regarding whether or not the IC card performs a low power consumption operation in a command reception waiting state.

According to a seventh aspect of the invention, in the IC card according to one or both of the third and fourth aspects, one or both of the information regarding the transmission rate and the information regarding the stop bit, and the initial response information. And a reference information storage unit that stores information regarding the relationship between the reference information storage unit and the information about the transmission rate or the stop bit, when one or both of the contents is changed by a command from the outside. And a changing unit for changing the content of the initial response information based on the information stored in.

[0012]

Hereinafter, an embodiment of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a block diagram showing an IC card 10 and a reader / writer device 20 according to the present invention.

First, the structure of the IC card 10 will be described with reference to FIG. As shown in the figure, the IC card 10 includes an I / O interface 11, a CPU 12,
The ROM 13, the RAM 14, and the EEPROM 15 are built in. The I / O interface 11 is an input / output circuit for transmitting / receiving data, and the CPU 12 uses the I / O interface.
It communicates with the reader / writer device 20 via the interface 11. A program to be executed by the CPU 12 is stored in the ROM 13, and the CPU 12 integrally controls the IC card 10 based on this program. The RAM 14 is a memory used as a work area when the CPU 12 performs such overall control. on the other hand,
The EEPROM 15 is a memory that stores original data to be recorded in the IC card 10.

The IC card 10 includes a reader / writer device 2
Power and clock are supplied from 0. Therefore, IC
When the card 10 is separated from the reader / writer device 20 or the like, the power supply and the clock supply to the IC card 10 are stopped. However, since the EEPROM 15 is a non-volatile memory, its recorded content is retained as it is even after the power supply is stopped. However, all the data in the RAM 14 is lost due to the stop of power supply.

Each memory 13, 14 in the IC card 10
All access to 15 is performed via the CPU 12, and these memories cannot be directly accessed from the outside. That is, from the reader / writer device 20 or the like to the CPU
When a predetermined “command” is given to 12, the CPU 1
2 interprets and executes this "command", and returns the result as a "response" to the reader / writer device 20 or the like.

FIG. 2 shows the ROM 13 and EEP of this embodiment.
It is a figure which shows an example of the address allocated to ROM15. In this embodiment, the address 00 is stored in the ROM 13.
00h-1FFFh to EEPROM15 for 8000h
Addresses of ~ 9FFFh are assigned. The “h” added to the end of the numerical value means that the numerical value is expressed in hexadecimal notation.

In the present embodiment, the ROM 13 indicates the communication conditions when the IC card 10 communicates with the reader / writer device 20.
Area of addresses 00A1h to 00A4h and EEPR
It is stored in a predetermined area after the address 8025h of the OM15. Addresses 00A1h and 00A2 of ROM 13
Information regarding the transmission rate of the communication signal is stored in h. For example, the address 00A1h stores a value of 9600 (bps) as the transmission rate A, and the address 00A2h stores a value of 19200 (bps) as the transmission rate B.

Addresses 00A3h and 00A4h
Stores information on the bit length of the stop bit. That is, the address 00A3h stores a value of 1 (bit) as the stop bit C, and the address 00A4h stores a value of 2 (bit) as the stop bit D.

On the other hand, the address 802 of the EEPROM 15
The designation identification of the user is stored in 5h. The designated identification is set to FFh before receiving the first CUSTOMIZE command. When the designated identification is FFh, another memory (“10 in the ROM in this embodiment” is used).
25h to 1029h ”) means that the ATR value and the transmission condition set at the time of manufacture should be referred to. After receiving the CUSTOMIZE command, the designated identification automatically replaces C3h internally. When the designated identification is C3h, it means that the ATR value set by the user should be referred to. In addition, at the address 8026h, R
A flag (hereinafter, referred to as “transmission rate flag”) that specifies which of the transmission rates A and B stored in the OM 13 is used for communication, that is, the transmission rate is stored. The transmission rate flag follows, for example, the transmission rate A when only the third bit is set to "1", and when the third bit and the first bit are set to "1", It indicates that communication should be performed according to the transmission rate B.

At the address 8027h of the EEPROM 16, a flag indicating which of the stop bits C and D stored in the ROM 13 the bit length of the stop bit should be set (hereinafter referred to as "stop bit flag").
Are stored from the 1st bit to the 7th bit. For the stop bit flag, for example, if the first bit is set to "1", the stop bit having the bit length indicated by the stop bit A is used, and if it is set to "0", the stop bit B is indicated. Indicates that communication should be performed using stop bits of the bit length that is set.

In the 8th bit of the address 8027h,
The sleep mode flag is set. The sleep mode is one of the operation modes of the IC card that automatically shifts to the low power consumption mode in the command reception waiting state. The sleep mode flag indicates that the sleep mode is used when it is “1” and does not use when it is “0”.

The address 8029h stores information that should form part or all of the initial response file. FIG. 3 is a diagram showing the items and contents of the initial response file. The content of the initial response file is standardized by ISO and is composed of format characters, interface characters and the like. In this embodiment, of the contents of the initial response file, the contents of the interface character are stored at address 8029h. Further, the address 8028h stores the length (number of bytes) of the interface character.

In this embodiment, when the IC card 10 communicates with the reader / writer device 20, the CPU 12 causes the E
The area after the address 8025h of the EPROM 15 is referred to and the communication condition is set based on the information stored therein. That is, in the IC card 10, the transmission speed flag and the stop bit flag stored in the EEPROM 15 are confirmed before starting the communication. Next, the transmission rate and the stop bit length designated by the confirmed transmission rate flag and the like are read from the ROM 13, and communication is performed under the conditions according to the contents. When making an initial response (ATR) to the reader / writer device, the interface character stored at address 8028h and thereafter is referenced, and an initial response file reflecting the contents is transmitted to the reader / writer device as an initial response.

FIG. 4 is a diagram showing an APDU of the CUSTOMIZE command used in the IC card according to the present embodiment. The CUSTOMIZE command is EEPRO
This is a command for setting / changing the transmission speed flag, stop bit flag, interface character, etc. stored in M16. CUSTOMIZE
Use commands to set contents such as transmission speed flags.
If changed, the contents after setting and changing will be valid after the next activation of the IC card.

In the first byte to the fourth byte of the CUSTOMIZE command, the command class (CL
A), type code (INS), parameters (P1, P)
2) is arranged. The sixth byte and subsequent bytes are the data field (DATA) of the command. In the data field, a transmission speed flag, a sleep mode flag and a stop bit flag, an interface character length, and an interface character are arranged from the beginning. Each value shown in FIG. 4, for example, is assigned to CLA to LC.

FIG. 5 is a flow chart showing the operation of the IC card 10 which processes the CUSTOMIZE command. IC
The card 10 can be read from the reader / writer device 20 to CUSTOM.
When the IZE command is received, a pre-execution check of the command is first performed (S101). The pre-execution check is, for example, whether LC is present and its value is proper, or D
Whether the received command is CU, such as whether ATA contents exist
It is performed as to whether or not the STOMIZE command has necessary information. If an error is found as a result of the pre-execution check (S102, No),
An error message to that effect is generated (S103).
The generated error message is sent to the reader / writer device 20 as a response (S117), and the command processing is ended.

If no error is found in the pre-execution check (S102, Yes), then CUST
The content of the data field (DATA) of the OMIZE command is confirmed (S104, S107, S110).
First, the IC card 10 has the first data field.
The byte (transmission rate) is checked, and the upper 4 bits and the lower 4 bits are 0100b, 0101b, 0110.
It is determined whether or not it is any value of b (S104,
S105). As a result, when the content of the first byte does not correspond to any of the above values (S105, N
o), an error message indicating that there is no corresponding data is generated (S106), and this is sent to the reader / writer device 20 as a response (S117). When the transmission of the response ends, the command processing ends.

If it is confirmed in S104 and S105 that the data of the first byte is normal, then the second byte (stop bit) of the data field is checked (S107). As a result of the check, the first
When the bit and the eighth bit have values other than 0 and 1 (S108, No), an error message indicating that there is no corresponding data is generated (S109). The generated error message is transmitted to the reader / writer device 20 as a response (S117), and then the command processing ends.

If it is confirmed in S107 and S108 that the data of the second byte is proper, then the third byte (interface character length) of the data field is checked (S110). .
As a result of the check, if the content of the third byte has a value exceeding 15 (S111, No), an error message indicating that there is no corresponding data is generated (S11).
2). The generated error message is transmitted to the reader / writer (S117), and the processing of the command is completed thereby.

The first to third bytes of the data field
When all the checks up to the byte are completed and it is confirmed that the contents of the data field are proper, then the process of writing the contents of the data field into the EEPROM 15 is executed (S113). Specifically, first, the user-specified identification at address 8025h is "FF
It is rewritten from "h" to "C3h". Next, CUSTO
The contents of the data field of the MIX command are sequentially written after the address 8026h. That is, E
The contents of the transmission speed flag and the like stored in the EPROM 15 are changed to the contents of the data field of the CUSTOMIZE command. When the writing is normally performed, a message to that effect is generated (S116), and is transmitted to the reader / writer device 20 as a response (S).
117). After sending the response, the IC card 10
The processing of the STOMIZE command ends.

As described above, in this embodiment, C
It is possible to set / change the communication conditions of the IC card 10 by using the USTOMIZE command. For example, the transmission rate is 9600 bps or 19200 bps
It is possible to freely set either one (when CLK = 3.5712 is supplied). In other words, in the present embodiment, the transmission speed, which was conventionally uniquely set at the time of shipping, can be set corresponding to the speed of the reader / writer device 20 used on the user side after the IC card is issued. It is possible.

Further, in this embodiment, the length of the stop bit can also be set / changed by using the CUSTOMIZE command. The stop bit is a bit indicating that the data has been sent when sending 1-byte data. When the stop bit is short, it may take time to store the data in the RAM 14 depending on the processing capability of the reader / writer device 20, and the data may not be captured. In this embodiment, in the above case, the stop bit can be lengthened to solve the problem. In addition, the stop bit can be shortened to increase the processing speed.

Further, in this embodiment, the contents of the initial response file can be changed. The contents of the initial response file often differ depending on the IC card system. For this reason, even if there are two systems in which the contents of the commands used are the same, if the contents of the initial response file specified in each system are different, one IC card is used for both. It cannot be used in the system. In contrast, in the present embodiment,
EEPROM using CUSTOMIZE command in advance
By changing the contents of the interface characters and the like stored in 15, it is possible to solve the above problem and make one IC card usable in a plurality of systems.

(Other Embodiments) The present invention is not limited to the above embodiment. The above embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the scope of the claims of the present invention. It is included in the technical scope of the invention.

In the above-described embodiment, the interface character stored in the EEPROM 15 is set / changed by the CUSTOMIZE command. This means that the IC card 10 sets the transmission speed and the stop bit stored in the EEPROM 15. The interface character may be automatically set / changed by referring to the value. The content of the data forming the interface character is defined by the ISO standard. According to the ISO standard, the stop bit is "1"
, The interface character TC1
(Refer to the figure) is set to "FF" and "00" when the stop bit is "2". At a clock frequency of 3.5712 MHz, the transmission rate is 9600 bp.
If it is s, TA1 is set to “11” and 19200b
In the case of ps, it is set to "12". Therefore, R
Predetermined data of the ISO standard required in the OM 13 is stored in advance, and when the information about the transmission speed or the stop bit is changed in the EEPROM 15, the CPU
12 refers to the data stored in the ROM 13,
The interface character stored in the EEPROM 15 may be rewritten if necessary.

In the above embodiment, the EEPROM 1
5, the transmission speed flag and the stop bit flag are stored, but these are 9600 and 19200 (b
The value of the transmission speed such as ps) or the value of the stop bit length such as 1 bit or 2 bits may be directly stored / changed in the EEPROM 15.

[0037]

As described above in detail, according to the present invention, after the IC card is issued, the communication condition of the IC card is set in accordance with the specifications of the reader / writer device used by the user. It is possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing an IC card and a reader / writer device according to the present invention.

FIG. 2 is a diagram showing an example of addresses assigned to a ROM 13 and an EEPROM 15.

FIG. 3 is a diagram showing items and contents of an initial response file.

FIG. 4 is a diagram showing an APDU of a CUSTOMIZE command.

FIG. 5 is a flowchart showing the operation of the IC card when processing a CUSTOMIZE command.

[Explanation of symbols]

 11 I / O Interface 12 CPU 13 ROM 14 RAM 15 EEPROM 20 Transaction Terminal Device

Claims (7)

[Claims] 1. An IC card characterized in that transmission conditions, transmission data, and operation characteristics can be customized. 2. An IC card having storage means for storing condition information relating to communication conditions, wherein the storage means is a rewritable storage means, and the storage means stores rewritable storage information of the condition information. An IC card whose contents can be changed by an external command. 3. The IC card according to claim 1, wherein the transmission condition or the condition information is information regarding a transmission speed. 4. The IC card according to claim 1, wherein the transmission condition or the condition information is information about a stop bit. 5. The IC card according to claim 1, wherein the transmission data or the condition information is initial response information relating to a part or all of the contents of the initial response file. card. 6. The IC card according to claim 1, wherein the operation characteristic or the condition information is information regarding whether to perform a low power consumption operation in a command reception waiting state. IC card. 7. The IC card according to claim 3 or 4, wherein information relating to a relationship between one or both of the information regarding the transmission rate and the information regarding the stop bit and the initial response information is provided. Information stored in the reference information storage means when the content of one or both of the information regarding the transmission rate or the information regarding the stop bit is changed by a reference information storage means for storing and a command from the outside. And a changing unit for changing the content of the initial response information based on the above.