JP2012252655A - Portable electronic device, ic card and control method of portable electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable electronic device which operates more stably, an IC card and a control method of the portable electronic device.SOLUTION: The portable electronic device comprises: a first memory for storing data; a second memory for storing a restoration address and restoration data in association with each other as memory guarantee data; a reception part for receiving a write command transmitted from an external device; a control part for acquiring an address and write data from the write command, identifying a region on the first memory on the basis of the address and a data size of the write data, storing data in the identified region as restoration data in the second memory and storing the address as a restoration address in the second memory; and a write processing part for writing the write data in the identified region of the first memory.

Description

  Embodiments described herein relate generally to a portable electronic device, an IC card, and a method for controlling 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.

  When receiving a command from a processing device that processes the IC card, the IC card executes an application in accordance with the received command. Thereby, the IC card can realize various functions. For example, when the IC card receives a write command, the IC card writes data to the nonvolatile memory based on the received write command.

JP 2007-320456 A

  The data size that the IC card can receive with one command has a limit value corresponding to the communication method. When the amount of data to be written to the IC card exceeds the amount of data that can be added to one command, the processing device divides the data into a plurality of data, and adds the divided data to the plurality of write commands. Send to card.

  However, if the power supply from the processing device is interrupted while data is being written in response to a plurality of write commands, there is a possibility that data in the nonvolatile memory of the IC card will be inconsistent.

  Therefore, an object of the present invention is to provide a portable electronic device, an IC card, and a portable electronic device control method that operate more stably.

  A portable electronic device according to an embodiment includes a first memory for storing data, a second memory for storing the restoration address and the restoration data in association with each other, and storing the data as memory guarantee data, and the writing transmitted from the external device A receiving unit that receives a command, an address and write data are obtained from the write command, an area on the first memory is specified based on the address and the data size of the write data, and specified A controller that stores data in the area as restored data in the second memory and stores the address in the second memory as a restored address; and the write data in the specified area on the first memory A write processing unit for writing

FIG. 1 is a diagram for explaining an example of an IC card processing system according to an embodiment. FIG. 2 is a diagram for explaining an example of an IC card according to an embodiment. FIG. 3 is a diagram for explaining an example of an IC card processing system according to an embodiment. FIG. 4 is a diagram for explaining an example of an IC card processing system according to an embodiment. FIG. 5 is a diagram for explaining an example of an IC card processing system according to an embodiment.

  Hereinafter, a portable electronic device, an IC card, and a method for controlling the portable electronic device according to an embodiment will be described in detail with reference to the drawings.

  The portable electronic device (IC card) 20 and the processing device (terminal device) 10 that processes the IC card 20 according to the present embodiment have, for example, functions of contact communication and / or non-contact communication. Thereby, the IC card 20 and the terminal device 10 can transmit and receive data to and from each other.

FIG. 1 shows a configuration example of an IC card processing system 1 according to an embodiment.
The IC card processing system 1 includes a terminal device 10 that processes the IC card 20 and an IC card 20.

  The terminal device 10 includes a CPU 11, a ROM 12, a RAM 13, a nonvolatile memory 14, a card reader / writer 15, an operation unit 17, a display 18, and a power supply unit 19. The CPU 11, the ROM 12, the RAM 13, the nonvolatile memory 14, the card reader / writer 15, the operation unit 17, and the display 18 are connected to each other via a bus.

  The CPU 11 functions as a control unit that controls the entire terminal device 10. The CPU 11 performs various processes based on the control program and control data stored in the ROM 12 or the nonvolatile memory 14. For example, the CPU 11 transmits and receives commands and responses to and from the IC card 20 via the card reader / writer 15.

  The ROM 12 is a non-volatile memory that stores a control program and control data in advance. The RAM 13 is a volatile memory that functions as a working memory. The RAM 13 temporarily stores data being processed by the CPU 11. For example, the RAM 13 temporarily stores data to be transmitted / received to / from an external device via the card reader / writer 15. The RAM 13 temporarily stores a program executed by the CPU 11.

  The nonvolatile memory 14 includes, for example, an EEPROM, an FRAM, and the like. The nonvolatile memory 14 stores, for example, a control program, control data, an application, and data used for the application.

  The card reader / writer 15 is an interface device for communicating with the IC card 20. The card reader / writer 15 transmits / receives data to / from the IC card 20 by contact communication or non-contact communication.

  When used as an interface for contact communication, the card reader / writer 15 includes a slot in which the IC card 20 is mounted and a plurality of contact terminals connected to a contact pattern included in the IC card 20.

  When the IC card 20 is mounted in the slot, the plurality of contact terminals of the card reader / writer 15 are connected to the contact pattern of the IC card 20. Thereby, the terminal device 10 and the IC card 20 are electrically connected. The card reader / writer 15 performs power supply, clock supply, reset signal input, data transmission / reception, and the like to the IC card 20 installed in the slot.

  When used as an interface for non-contact communication, the card reader / writer 15 includes a signal processing unit that performs signal processing on data to be transmitted and received, and an antenna having a predetermined resonance frequency.

  For example, the card reader / writer 15 performs signal processing such as encoding, decoding, modulation, and demodulation on data to be transmitted and received by a signal processing unit. The card reader / writer 15 supplies the encoded and modulated data to the antenna. The antenna generates a magnetic field according to the supplied data. Thereby, the terminal device 10 can transmit data to the IC card 20 existing in the communicable range in a non-contact manner.

  Further, the antenna of the card reader / writer 15 detects a magnetic field and generates a signal according to the detected magnetic field. Thereby, the card reader / writer 15 can receive a signal in a non-contact manner. The signal processing unit demodulates and decodes the signal received by the antenna. Thereby, the terminal device 10 can acquire the original data transmitted from the IC card 20.

  The operation unit 17 includes, for example, operation keys and generates an operation signal based on an operation input by the operator. The operation unit 17 inputs the generated operation signal to the CPU. Thereby, CPU11 can matter about processing based on operation inputted by an operator.

  The display 18 displays various information based on signals for displaying video input from the CPU 11 or a display processing module such as a graphic controller (not shown).

  The power supply unit 19 supplies power to each unit of the terminal device 10. For example, the power supply unit 19 receives power from a commercial power supply, converts the power into a predetermined voltage, and supplies the voltage to each unit of the terminal device 10.

FIG. 2 shows a configuration example of the IC card 20 according to one embodiment.
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 a communication unit 24. The IC chip 23 and the communication unit 24 are formed in the IC module 22 while being 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 communication unit 24 is disposed can be installed.

  The IC chip 23 includes a communication unit 24, a CPU 25, a ROM 26, a RAM 27, a nonvolatile memory 28, a power supply unit 31, a logic unit 32, and the like. The communication unit 24, the CPU 25, the ROM 26, the RAM 27, the nonvolatile memory 28, the power supply unit 31, and the logic unit 32 are connected to each other via a bus.

  The communication unit 24 is an interface for communicating with the card reader / writer 15 of the terminal device (external device) 10. The communication unit 24 transmits / receives data to / from the terminal device 10 by contact communication or non-contact communication.

  When used as an interface for contact communication, the communication unit 24 includes a contact pattern connected to a contact terminal of the card reader / writer 15. The contact pattern is a contact terminal formed on the surface of the IC module 22 with a conductive metal or the like. That is, the contact pattern is formed so as to be in contact with the contact terminal of the card reader / writer 15 of the terminal device 10.

  The contact pattern is formed by dividing a surface formed of metal into a plurality of areas. Each divided area functions as a terminal. The communication unit 24 can transmit / receive data to / from the card reader / writer 15 via the contact pattern.

  When used as an interface for non-contact communication, the communication unit 24 includes a signal processing unit and an antenna.

  The signal processing unit performs signal processing such as encoding and load modulation on data to be transmitted to the terminal device 10. For example, the signal processing unit modulates (amplifies) data to be transmitted to the terminal device 10. The signal processing unit supplies the signal-processed data to the antenna.

  The antenna is constituted by, for example, a metal wire disposed in a predetermined shape in the IC module 22. The IC card 20 generates a magnetic field by an antenna according to data transmitted to the terminal device 10. Thereby, the IC card 20 can transmit 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.

  For example, the signal processing unit demodulates and decodes the induced current generated in the antenna. For example, the signal processing unit analyzes a signal received by the antenna. As a result, the communication unit 24 acquires binary logical data. The communication unit 24 transmits the analyzed data to the CPU 25 via the bus.

  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 terminal device 10 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 communication unit 24. The RAM 27 temporarily stores data to be transmitted to the terminal device 10 via the communication unit 24. Furthermore, the RAM 27 temporarily stores a program executed by the CPU 25.

  The non-volatile memory 28 includes 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.

  For example, the non-volatile memory 28 includes a master file (MF), a dedicated file (DF), and an elementary file (EF).

  The MF is a file that is the basis of the file structure. The DF is created below the MF. The DF is a file that stores applications and data used for the applications in groups. EF is created below DF. The EF is a file for storing various data. In some cases, an EF is placed directly under the MF.

  There are various types of EFs, such as Working Elementary File (WEF) and Internal Elementary File (IEF). The WEF is a working EF and stores personal information and the like. The IEF is an internal EF and stores data such as an encryption key (password) for security.

  Further, a management file or the like is stored in the nonvolatile memory 28. The IC card 20 can recognize the data in the nonvolatile memory 28 as a file structure from the management file.

  In addition, the nonvolatile memory 28 includes a commit buffer memory (commit buffer) 28a used for a process (memory guarantee process) for guaranteeing data held by itself. The memory guarantee process and the commit buffer will be described later.

  The power supply unit 31 supplies power to each unit of the terminal device 10. When the IC card 20 has a configuration for performing contact communication, the power supply unit 31 supplies power supplied from the card reader / writer 15 to each unit of the IC card 20 via the contact pattern of the communication unit 24.

  In addition, when the IC card 20 has a configuration for performing contactless communication, power is generated based on radio waves transmitted from the antenna of the card reader / writer 15, 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 an arithmetic unit that performs arithmetic processing by hardware. For example, the logic unit 32 performs processes such as encryption, decryption, hash calculation, and random number generation based on a command from the terminal device 10. 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.

  For example, when writing data exceeding the amount of data that can be transmitted with one command to the IC card 20, the terminal device 10 divides the data into a plurality of data, and adds the divided data to the plurality of write commands. To the IC card 20. In this example, data to be written to the IC card 20 is added to the first write command, the second write command, and the third write command.

FIG. 3 shows an example of the issuing process of the IC card 20 by the terminal device 10.
First, the terminal device 10 can establish a logical channel with the IC card 20 by transmitting a command to the IC card 20. As a result, the terminal device 10 establishes a communication path with the IC card 20. Further, the terminal device 10 transmits a command for selecting a file in the nonvolatile memory 28 to the IC card 20. As a result, the IC card 20 enters a state of selecting the file specified by the command.

  Here, when data (write data) is written to the IC card 20 using the memory guarantee process, the terminal device 10 inquires the capacity of the commit buffer 28a of the nonvolatile memory 28 of the IC card 20 (commit buffer inquiry command). Is transmitted to the IC card 20 (step S11).

  The commit buffer 28a is a system area managed by the operating system of the IC card 20. The commit buffer 28 a is an area that is not used for a file in the nonvolatile memory 28. That is, the size (capacity) of the commit buffer 28 a is related to the specifications of the nonvolatile memory 28 and the capacity of the file in the nonvolatile memory 28.

  When receiving the commit buffer inquiry command, the IC card 20 checks the capacity of the commit buffer 28a of its own nonvolatile memory 28 (step S12). For example, the IC card 20 calculates the capacity of the commit buffer 28a based on the specifications held by itself and the capacity used as a file. The IC card 20 generates a response including information indicating the capacity of the commit buffer 28a, and transmits the generated response to the terminal device 10 (step S13).

  The terminal device 10 recognizes the capacity of the commit buffer 28a of the IC card 20 by analyzing the received response. Further, the terminal device 10 determines whether or not to execute the memory guarantee process based on the capacity of the commit buffer 28a and the capacity of the write data to be written to the IC card 20. For example, when the capacity of the commit buffer 28a is equal to or larger than the capacity of the write data, the terminal device 10 determines that the memory guarantee process can be executed.

  The terminal device 10 generates a write command to be transmitted to the IC card 20 (Step S14). As described above, when the write data exceeds the amount of data that can be transmitted with one command, the terminal device 10 divides the write data into a plurality of write data. The terminal device 10 generates a write command having each divided write data.

  For example, when the write data is divided into first write data, second write data, and third write data, the terminal device 10 uses the first write command having the first write data, the second write data, A second write command having data and a third write command having third write data are generated.

  Further, the terminal device 10 adds information indicating the start or end of the memory guarantee process to each write command. For example, when commands are transmitted to the IC card 20 in the order of the first write command, the second write command, and the third write command, the terminal device 10 sets the first write command to start the memory guarantee process. Information indicating the end of the memory guarantee process is added to the third write command.

  The terminal device 10 sequentially transmits the generated write command to the IC card 20. First, the terminal device 10 transmits a first write command to the IC card 20 (step S15). If the received write command has information indicating the start of the memory guarantee process, the IC card 20 writes data using the memory guarantee process (step S16). The IC card 20 generates a response based on the result of the memory guarantee process, and transmits the generated response to the terminal device 10 (step S17).

  When the terminal device 10 receives the response to the first write command, the terminal device 10 transmits the second write command to the IC card 20 (step S18). If the memory guarantee process has already been started, the IC card 20 writes data using the memory guarantee process (step S19). The IC card 20 generates a response based on the result of the memory guarantee process, and transmits the generated response to the terminal device 10 (step S20).

  When receiving a response to the second write command, the terminal device 10 transmits a third write command to the IC card 20 (step S21). If the memory guarantee process has already been started, the IC card 20 writes data using the memory guarantee process (step S22). The IC card 20 generates a response based on the result of the memory guarantee process, and transmits the generated response to the terminal device 10 (step S23).

  Furthermore, when the received write command has information indicating the end of the memory guarantee process, the IC card 20 erases all the data in the commit buffer 28a. That is, the IC card 20 clears the commit buffer 28a.

FIG. 4 shows an example of processing of the IC card 20.
When activated, the IC card 20 holds a state of waiting for a command from the terminal device 10. The IC card 20 performs initial setting according to a command received from the terminal device, and opens a logical channel. Further, the IC card 20 selects a file in the nonvolatile memory 28 in accordance with the command received from the terminal device 10.

  Here, the IC card 20 receives the write command transmitted from the terminal device 10 (step S31). Further, the IC card 20 analyzes the received write command (step S32). Thereby, the IC card 20 acquires the write data, the address indicating the write destination of the write data, and the information related to the memory guarantee process from the write command.

  The write command includes, for example, “CLA”, “INS”, “P1”, “P2”, “Lc”, “Data”, and “Le”.

  “CLA” is a class byte indicating the stratification of the command. “INS” is an instruction byte indicating the type of command. “P1” and “P2” are parameter bytes indicating parameters according to “INS”.

  “Lc” is a length field for coding number Nc indicating the length (number of bytes) of data of “Data”. “Data” is a command data field indicating the data body of the command. “Le” is a length field for coding number Ne indicating the data length of the response to the command.

  That is, “CLA” and “INS” indicate whether the command is a write command or another command. The IC card 20 can recognize the type of the received command by analyzing the “CLA” and “INS” values of the received command.

  For example, when the command is a write command, the IC card 20 acquires write data from within “Data”. Further, the IC card 20 acquires an address from “Data”, “P1”, “P2”, or the like. Further, the IC card 20 acquires information related to the memory guarantee process from “Data”, “P1”, “P2”, or the like. The information related to the memory guarantee process is information indicating the start of the memory guarantee process or information indicating the end of the memory guarantee process.

  The IC card 20 determines whether or not to start the memory guarantee process (step S33). That is, the IC card 20 determines to start the memory guarantee process when the received write command includes information indicating the start of the memory guarantee process.

  If it is determined in step S33 that the received write command includes information indicating the start of the memory guarantee process, the IC card 20 sets a restoration address (step S34). That is, the IC card 20 stores the address acquired from the write command in the commit buffer 28a of the nonvolatile memory 28 as a restoration address.

  If it is determined in step S33 that the received write command does not include information indicating the start of the memory guarantee process, the IC card 20 proceeds to step S35.

  The IC card 20 determines whether the memory guarantee process is ongoing (step S35). If it is determined in step S33 that the memory guarantee process is started, the IC card 20 stores information indicating that the memory guarantee process is continuing in the RAM 27 or the nonvolatile memory 28. The IC card 20 determines whether or not the memory guarantee process is ongoing based on the presence / absence of information indicating that the memory guarantee process is ongoing.

  If it is determined in step S35 that the memory guarantee process is continuing, the IC card 20 sets the data size (step S36). The IC card 20 generates information (data size) indicating the size of the write data based on the acquired size of the write data, and stores it in the commit buffer 28 a of the nonvolatile memory 28. The IC card 20 stores the data size in association with the restoration address stored in the commit buffer 28a in step S34. If the data size is already associated with the restoration address, the value indicated by the generated data size is added to the data size associated with the restoration address.

  The IC card 20 determines whether or not the memory guarantee process can be executed (step S37). For example, the IC card 20 determines whether or not the capacity indicated by the data size associated with the restoration address is less than or equal to the capacity of its own commit buffer 28a. The IC card 20 determines that the memory guarantee process can be executed when the capacity indicated by the data size associated with the restoration address is less than or equal to the capacity of its own commit buffer 28a.

  If it is determined in step S37 that the memory guarantee process can be executed, the IC card 20 saves the data stored at the position indicated by the address acquired from the write command (step S38).

  The IC card 20 reads from the nonvolatile memory 28 an amount of data corresponding to the data size of the write data included in the write command from the position indicated by the address acquired from the write command. That is, the IC card 20 specifies an area on the nonvolatile memory 28 based on the address acquired from the write command and the data size of the write data, and reads the data stored in the specified area.

  The IC card 20 stores the read data as restoration data in association with the restoration address in the commit buffer 28a. That is, the IC card 20 saves the data stored at the position where the write data is written to the commit buffer 28a. If the restoration data is already associated with the restoration address, the restoration data is added to the restoration data already stored.

  Through the above processing, the memory guarantee data 281 is stored in the commit buffer 28a of the nonvolatile memory 28 as shown in FIG. The memory guarantee data 281 stores a restoration address, a data size, and restoration data in association with each other. Further, the commit buffer 28a of the nonvolatile memory 28 may be configured to further store memory guarantee data 282 having a restoration address different from the restoration address of the memory guarantee data 281. In this case, data of a plurality of non-contiguous areas in the nonvolatile memory 28 can be ensured. A process for ensuring data in a plurality of non-continuous areas will be described later.

  If it is determined in step S35 that the memory guarantee process is not continuing, the IC card 20 proceeds to step S39.

  The IC card 20 writes the write data acquired from the write command in the area on the nonvolatile memory 28 indicated by the address acquired from the write command (step S39).

  The IC card 20 determines whether or not to end the memory guarantee process (step S40). In other words, the IC card 20 determines to end the memory guarantee process when the received write command includes information indicating the end of the memory guarantee process.

  If it is determined in step S40 that the received write command includes information indicating the end of the memory guarantee process, the IC card 20 clears the commit buffer 28a (step S41). That is, the IC card 20 deletes the memory security data corresponding to the received write command from the memory security data stored in the commit buffer 28a.

  If it is determined in step S40 that the received write command does not include information indicating the end of the memory guarantee process, the IC card 20 proceeds to step S42.

  The IC card 20 generates a response based on the result of the process executed based on the received write command (step S42). That is, the IC card 20 generates a response indicating normal end when the writing process can be normally completed. When an error occurs in the writing process, the IC card 20 generates a response indicating that an error has occurred.

  If it is determined in step S37 that the memory guarantee process cannot be executed, the IC card 20 generates a response indicating that an error (overflow) has occurred in the memory guarantee process (step S43).

  The IC card 20 transmits the generated response to the terminal device 10 and ends the process based on one command.

  Here, when the supply of power to the IC card 20 is interrupted during processing of a plurality of related write commands as shown in FIG. 3, the IC card 20 keeps storing the memory security data in the commit buffer 28a. Stop.

  When the IC card 20 is activated next time, it determines whether or not memory guarantee data exists in the commit buffer 28a. That is, when the IC card 20 is activated, the IC card 20 refers to the commit buffer 28a and determines the presence / absence of memory guarantee data.

  When it is determined that the memory guarantee data exists in the commit buffer 28a, the IC card 20 specifies the position in the nonvolatile memory 28 based on the restoration address of the memory guarantee data. The IC card 20 reads the restoration data of the memory security data and writes the read restoration data from the specified position. Thereby, the IC card 20 can restore the data in the nonvolatile memory 28. Further, the IC card 20 deletes the memory guarantee data used for the restoration from the commit buffer 28a.

  Further, the IC card 20 may be configured to perform the above restoration when a predetermined command is received from the terminal device 10. For example, the IC card 20 may be configured to perform the above restoration when receiving a command for instructing to stop the writing process from the terminal device 10.

  Further, the IC card 20 may be configured to perform the above restoration when it is determined that it is necessary to stop the writing process based on the writing command. For example, the IC card 20 performs restoration when an overflow of the commit buffer 28a occurs, when an abnormality is detected on the terminal device 10 side, or when a subsequent write command is no longer transmitted from the terminal device 10.

  As described above, the IC card 20 stores the data already stored in the destination to which the write data on the nonvolatile memory 28 is written together with the address in the commit buffer 28a as the memory security data. Further, the IC card 20 checks the presence / absence of the memory guarantee data at the time of activation, and restores the data in the nonvolatile memory 28 based on the memory guarantee data when the memory guarantee data exists.

  Thereby, even if the IC card 20 is stopped in the middle of processing of a plurality of continuous write commands, the data in the nonvolatile memory 28 can be restored. Thereby, it is possible to prevent inconsistency in data on the nonvolatile memory 28. As a result, a portable electronic device, an IC card, and a method for controlling the portable electronic device that operate more stably can be provided.

  Further, as described above, the IC card 20 can guarantee data in a discontinuous area on the nonvolatile memory 28.

  In this case, the IC card 20 generates memory guarantee data for each address acquired from the write command. The IC card 20 can specify the corresponding memory security data based on, for example, the address included in the write command. When a new write command is received, the IC card 20 acquires an address from the write command, and sets the data size and saves the restored data for the memory security data corresponding to the acquired address. Thereby, the IC card 20 can guarantee data of a plurality of discontinuous areas on the nonvolatile memory 28.

  In the above-described embodiment, the IC card 20 has been described as a configuration that notifies the terminal device 10 of the capacity of the commit buffer 28a when receiving a commit buffer inquiry command. However, the configuration is not limited to this configuration. For example, the IC card 20 may be configured to notify the terminal device 10 of the capacity of the commit buffer 28a when receiving an initial setting command instructing establishment of a logical channel from the terminal device 10.

  Further, although the terminal device 10 has been described as a configuration in which information indicating the start or end of the memory guarantee process is added to the write command, the terminal device 10 is not limited to this configuration.

  For example, the terminal device 10 may be configured to add information indicating the number of related commands to the write command. In this case, the IC card 20 specifies a command for performing the memory guarantee process based on the number of related commands added to the write command.

  Further, for example, the terminal device 10 may be configured to add information indicating whether or not there is a related command to the write command. In this case, the IC card 20 performs a memory guarantee process until it receives information indicating that there is no further related command.

  Further, for example, the terminal device 10 may be configured to instruct the start and end of the memory guarantee process with a predetermined command. In this case, the IC card 20 performs the memory security process after receiving the command instructing the start of the memory security process until receiving the command instructing the end of the memory security process.

  It should be noted that the functions described in the above embodiments are not limited to being configured using hardware, but can be realized by causing a computer to read a program describing each function using software. Each function may be configured by appropriately selecting either software or hardware.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 1 ... IC card processing system, 10 ... Terminal device, 11 ... CPU, 12 ... ROM, 13 ... RAM, 14 ... Non-volatile memory, 15 ... Card reader / writer, 17 ... Operation part, 18 ... Display, 19 ... Power supply part, DESCRIPTION OF SYMBOLS 20 ... IC card, 21 ... Main body, 22 ... IC module, 23 ... IC chip, 24 ... Communication part, 25 ... CPU, 26 ... ROM, 27 ... RAM, 28 ... Non-volatile memory, 28a ... Commit buffer, 31 ... Power supply Part, 32... Logic part.

Claims (9)

A first memory for storing data;
A second memory for storing the restoration address and the restoration data in association with each other as memory guarantee data;
A receiving unit that receives a write command transmitted from an external device;
An address and write data are obtained from the write command, an area on the first memory is specified based on the address and the data size of the write data, and the data in the specified area is used as restoration data A controller that stores in the second memory and stores the address in the second memory as a restored address;
A write processing unit for writing the write data to the specified area on the first memory;
A portable electronic device comprising:   The portable electronic device according to claim 1, wherein the second memory stores the memory guarantee data for each different restoration address.   The control unit specifies a position on the first memory based on the restoration address of the memory security data when the memory security data exists in the second memory when the portable electronic device is activated. The portable electronic device according to claim 1, wherein the restoration data of the memory guarantee data is written in the specified position. Further comprising a transmitter for transmitting a response to the external device;
When receiving a command for inquiring the capacity of the second memory from the external device, the control unit checks the capacity of the second memory and generates the response based on the capacity of the second memory. The portable electronic device according to claim 1 or 2. Further comprising a transmitter for transmitting a response to the external device;
The portable electronic device according to claim 1, wherein the control unit generates the response indicating an error when a capacity of the second memory is less than a data size of the write data. The receiving unit receives information indicating start and information indicating end from the external device,
The control unit stores the restoration data and the restoration address in the second memory after receiving the information indicating the start by the receiving unit until receiving the information indicating the end. Item 3. The portable electronic device according to Item 1 or 2.   The portable electronic device according to claim 6, wherein the control unit deletes the memory guarantee data stored in the second memory when the information indicating the end is received by the receiving unit. An IC module comprising the above-mentioned parts;
A main body on which the IC module is disposed;
The IC card according to claim 1, further comprising: A method for controlling a portable electronic device used in a portable electronic device comprising: a first memory that stores data; and a second memory that stores the restored address and restored data in association with each other and stores them as memory security data. There,
Receives a write command sent from an external device,
An address and write data are obtained from the write command, an area on the first memory is specified based on the address and the data size of the write data, and the data in the specified area is used as restoration data Storing in the second memory, storing the address in the second memory as a restored address;
Writing the write data in the identified area on the first memory;
Control method of portable electronic device.

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