JP2974144B2 - Portable electronic devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a so-called IC card having a built-in IC (integrated circuit) chip having a control element such as a nonvolatile memory and a CPU. More particularly, the present invention relates to a portable electronic device having an improved method for identifying a data file defined for a memory and an improved method for defining an area for the data file.

(Prior Art) In recent years, as a new portable data storage medium, a so-called IC card having a built-in IC chip having a control element such as an erasable nonvolatile memory and a CPU has attracted attention. This type of IC card selectively performs data input / output with the outside by accessing a built-in memory by a built-in control element.

Recently, in such an IC card, one common data file (CDF) for operating a memory in common with all applications and a plurality of application data files (CDF) for operating each application in order to support various applications. ADF) is defined as being divided into large parts, and each data file is defined as being divided into smaller parts using a concept called an area.

These areas are the unit of access to the memory. At the time of access, the identification information (for example, the area number) assigned to the area is designated from the outside, so that the area can be accessed inside the IC card. Direct access to existing areas.

Access to an area in a data file is performed by externally designating identification information (for example, a data file name) assigned to a data file in which an area to be accessed exists and selecting the data file. It is.

By the way, in the conventional method of defining an area for a data file in such an IC card, the order of each data file is recognized externally (such as an IC card issuing system) and the number of areas defined in each data file is determined. Recognize, for example, the first data file (CD
Assuming that ten areas are defined in F), the eleventh area is identified inside the IC card as the first area of the second data file (ADF). .

However, in such an area defining method, the order of the data files, especially the common data file (first
It is necessary to externally recognize the order of the data file as the data file to be used, and also externally recognize the number of areas defined in each data file. For this reason, the sequence for defining an area in each data file is different from the access sequence for a normal area, and a load is placed on the IC card issuing system.

Conventionally, among a plurality of data files, a data file that can be specified by all applications has been treated as a common data file. That is, the format is realized by the entire concept system of the common data file and the application data file.

However, according to this, identification information for designating a common data file must be incorporated in all application systems. That is, a common data file among a plurality of data files must be accessed by being specially identified by an external application. Therefore, a load is applied to the application system.

(Problems to be Solved by the Invention) According to the present invention, as described above, in the conventional area definition method for a data file, the order of the data file and the number of areas defined in the data file must be recognized externally. In order to solve the problem that the load is imposed on the issuing system of this device, the data file is created without externally recognizing the order of defining the data file and the number of areas defined in the data file. It is an object of the present invention to provide a portable electronic device in which a data file of which area is to be selected can be selected at random, and the load on an issuing system that issues the present device is reduced.

Further, according to the present invention, as described above, in the conventional method for identifying a common data file and an application data file, the common data file among a plurality of data files must be specifically identified and accessed by an external application. The purpose of this is to solve the problem that the load on the application system is increased. The common data file among the multiple data files does not need to be specially identified by an external application to access, reducing the load on the application system. It is an object of the present invention to provide a portable electronic device.

[Structure of the Invention] (Means for Solving the Problems) A portable electronic device according to the present invention includes a common data file commonly used by a plurality of applications and a plurality of second data files used individually by the applications. And each data file has a memory area divided into a plurality of areas, and the common data file stores identification information of each area in the common data file; And a data file defining means for defining the common data file and the plurality of second data files with respect to the memory. And selecting a first one of the plurality of second data files based on an external command.
Means for judging whether or not the command data inputted from the outside is an area definition command including area identification information for additionally defining an area in a file and size information of the area. And when the second means determines that the area definition command is the area definition command, the area definition information having the same identification information as the area identification information in the area definition command is stored in the first means. A third means for determining whether or not the file already exists in the currently selected file, and a file for which the definition information of the area having the same identification information is selected by the third means. If it is determined that the address information does not already exist, the fourth means for generating the address information of the area additionally defined by the area definition command and the same identification information by the third means D with When A is determined not to already exist in memory, and the size information of the identification information and the area for the area in the definition command of the area, the fourth
A fifth means for generating area definition information including address information of the area generated by the first means and storing the area definition information in a file currently selected by the first means; When it is determined that the area definition information having the same identification information as the area identification information in the area definition command already exists in the memory, the area having the same identification information already exists. Sixth means for outputting response data to the effect that the

In addition, the portable electronic device of the present invention has a common data file commonly used by a plurality of applications and a plurality of second data files used by each application, and includes a plurality of second data files. Has a memory area divided into a plurality of areas, stores the identification information of each area in the common data file in the common data file, and stores the identification information in the second data file in the second data file. A memory storing identification information of each area, data file defining means for defining the common data file and the plurality of second data files with respect to the memory, and the plurality of First means for selecting one of the two data files, and an instruction data inputted from the outside adds an area into the file. Second means for determining whether or not the area definition command includes area identification information for defining the area and size information of the area; and the second means determines that the area definition command is an area definition command. In this case, the area definition information having the same identification information as the area identification information in the area definition command already exists in the common data file and the file currently selected by the first means. A third means for determining whether or not the area has the same identification information as the definition information of the area which has not already existed in the memory; A fourth means for generating address information of an area additionally defined by the definition instruction; and a third means for determining that an area having the same identification information does not already exist in the memory. Is Area definition information including the area identification information and the area size information in the area definition instruction and the area address information generated by the fourth means, and generated by the first means. When the second data file is selected, the area definition information is stored in the selected second data file, and when the second data file is not selected by the first means. Comprises fifth means for storing area definition information in the common data file.

Further, the portable electronic device of the present invention includes a common data file commonly used by a plurality of applications,
A plurality of second data files used individually for each application, and each data file has a memory area divided into a plurality of areas, and the common data file has a common data file A memory storing identification information of each area in the second data file; and a memory storing the common data file and the plurality of Data file defining means for defining a second data file, and a data file including data file identification information and size information of the data file for externally input instruction data to additionally define the second data file Means for determining whether or not the instruction is a definition command of the data file, and a definition instruction of the data file by the first means. A second means for generating address information of a file additionally defined by a data file definition command when it is determined that the data file is defined, file identification information in the data file definition command, and a size of the data file; Third means for generating file definition information consisting of information and address information of the data file generated by the second means and storing the file definition information in a memory; and a selection instruction including identification information of the data file from outside. Means for selecting one of the plurality of second data files on the basis of the following, identification information of an area for additionally defining an area in the command data inputted from the outside, and information of the area. Fifth means for determining whether the instruction is an area definition instruction including size information, and the fifth means determines that the instruction is an area definition instruction. In this case, it is determined whether or not the area definition information having the same identification information as the area identification information in the area definition command already exists in the file currently selected by the fourth means. A sixth means for executing the area definition command when it is determined that the area definition information having the same identification information does not already exist in the currently selected file. A seventh means for generating address information of an area additionally defined in the area, identification information of the area in the area definition command and size information of the area, and an address of the area generated by the seventh means. Eighth means for generating area definition information including address information and storing it in the file currently selected by the first means, and for storing instruction data input from the outside into the area in the file. Ninth means for determining whether or not the command is an area processing command including identification information and command information of an area for access, and when the ninth means determines that the command is an area processing command, When one of the second data files is currently selected by the fourth means, an area having identification information specified by the area processing instruction in the selected second data file. And find the fourth
If one of the second data files is not currently selected by the means, the tenth means for finding an area having the identification information specified by the area processing instruction in the common data full; And eleventh means for accessing the area found by the tenth means.

(Operation) The present invention has means for selectively specifying each defined data file, and by defining a plurality of areas only for the specified data file, the order in which the data files are defined can be determined. It is possible to select a data file randomly and make it an area definition target data file without external recognition. Therefore, the load on the issuing system that issues this apparatus is reduced.

The present invention also has means for selectively designating a plurality of defined application data files (second data files), defining a plurality of areas only for the designated application data files, Further, when the application data file is not specified, by defining a plurality of areas only for the defined common data file (first data file), the order in which the data files are defined is not recognized externally, and It is not necessary to externally recognize the number of the common data file among them or the number of areas defined in each data file. Also, the sequence for defining an area in each data file can be the same as the sequence for accessing a normal area. Therefore, the load on the issuing system that issues this apparatus is reduced.

Furthermore, the present invention does not externally identify and operate one data file as a common data file among a plurality of data files, but performs the identification internally so that a common data file among a plurality of data files can be used. Need not be identified and accessed by an external application. Therefore, the load on the application system is reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 14 shows a configuration example of a terminal device that handles an IC card as a portable electronic device according to the present invention. That is, this terminal device allows the IC card 1 to be connected to a control unit 3 including a CPU or the like via a card reader / writer 2, and the control unit 3 includes a keyboard 4, a CRT display device 5, a printer 6, and a floppy disk. The device 7 is connected.

The IC card 1 is held by the user, and refers to a personal identification number known only to the user when, for example, purchasing a product, accumulates necessary data, and the like. For example, FIG. 13 shows its functional blocks. As shown in the read / write section 11,
It comprises a part for executing basic functions such as a password setting / password collating unit 12 and an encryption / decryption unit 13, and a supervisor 14 for managing these basic functions.

The read / write unit 11 has a function of reading, writing, or erasing data from the data memory 16 or the like.

The password setting / password collation unit 12 has a function of performing storage and reading prohibition processing of the password set by the user, collating the password after setting the password, and giving permission for the subsequent processing.

The encryption / decryption unit 13 performs, for example, encryption for preventing leakage or forgery of communication data when data is transmitted from the control unit 3 to another terminal device via a communication line, and encryption / decryption of the encrypted data. Performs decryption, such as DES
(Data Encryption Standard). This function performs data processing according to an encryption algorithm having sufficient encryption strength.

The supervisor 14 has a function of decoding a function code input from the card reader / writer 2 or a function code to which data is added, and selecting and executing a necessary function among the basic functions.

In order to exhibit these various functions, the IC card 1
For example, as shown in FIG. 12, a control element (control section) 15 such as a CPU, a data memory (memory section) 16, a program memory 17, and a contact section 18 for obtaining electrical contact with the card reader / writer 2 Is composed of
Among these, the control element 15, the data memory 16, and the program memory 17 are composed of one IC chip (or a plurality of IC chips) and are embedded in the IC card body.

The program memory 17 is formed of, for example, a mask ROM, and stores a control program of the control element 15 having a subroutine for realizing each of the basic functions.

The data memory 16 is used for storing various data, and is composed of an erasable nonvolatile memory such as an EEPROM.

For example, as shown in FIG. 2, the data memory 16 stores one common data file (CDF) 21 commonly used by all applications and a plurality of application data files (ADF) 22 used for each application. , ... are largely divided and defined. These data files (DF) 21 and 22 are defined by data file definition information 24 of a data file definition table 23. In this case, the data file definition information 24 is stored from one end (for example, the starting address) of the data memory 16, and the data files 21, 22 defined by the data file definition information 24 are stored at the other end (for example, (Last address).

Here, the data file definition information 24 is, for example, the third
As shown in the figure, a data file name (DFN) as identification information for specifying a data file, head address information on a memory to which the data file is allocated, size information and access condition information, total area allocation head address information, It is a data string in which area unallocated size information is associated.

In the state where no area is defined in the defined data file, the value of the area unallocated size information is the maximum size of the data file, and the value of the total area allocation start address information is Is a value obtained by adding “1” to the final address of the data file.

The data file definition information 24 is sequentially stored according to data file definition command data described later.
In the example shown in FIG. 2, the data file names “00000”, “NNNNN”,..., “ZZZZZ” are stored in this order by this instruction data. Reserved internally as data file name.

Also, as shown in FIG. 4, the common data file 21 is divided into a plurality of areas 25,..., 28,. These areas 25 and 28 are defined by the area definition information 27 and 30 of the area definition tables 26 and 29, respectively. In this case, the area definition information 27, 30 is stored from one end (for example, the first address) of the data files 21, 22,
Each area 2 defined by the area definition information 27, 30
5, 28 are defined from the other end (for example, the last address) of the data files 21, 22.

Here, as shown in FIG. 6, for example, the area definition information 27, 30 includes an area number (AID) as identification information for specifying an area, head address information on a memory to which the area is allocated, size information, It is a data string associated with access condition information.

The area definition information 27, 30 is sequentially stored according to area definition command data described later. In the example of FIG. 4, according to this instruction data, the area numbers “01”, “0”
2 ”,...“ 03 ”are stored in the order, and in the example of FIG.
The instruction data is stored in the order of the area numbers “04”,..., “05”.

FIG. 7 shows a data file unallocated size storage unit 31 for storing data file unallocated size information and a total data file allocation start address storage unit 32 for storing total data file allocation start address information. For example, it is provided in the data memory 16.

In the state where no data file is defined, the value of the data file unallocated size information is the maximum size provided for the data file allocation as the data memory 16 and the total data file allocation The address information is a value obtained by adding “1” to the last address of the area in the data memory 16 given for data file allocation.

Next, the operation of such a configuration will be described with reference to the flowchart shown in FIG.

First, the data file definition process will be described. In the steady state, it is in a state of waiting for external command data, and when command data is input in this state, the control element
Step 15 determines whether or not the data is data file definition command data as shown in FIG. If the result of this determination is that the data is not data file definition command data, the control element 15 proceeds to a process of determining that it is another command data.

As a result of the determination of the command data, if the command file is the data file definition command data, the control element 15 finds the data file definition information having the same data file name as the data file name in the command data from the data file 16. If found, the control element 15 outputs response data indicating that the data file name already exists, and returns to the command data waiting state.

If not found, the control element 15 adds the number of bytes (size information) of the data file definition information to the file size information in the instruction data, sets the result to result 1, and stores the result in the data file unallocated size storage unit 31. To the value of. As a result of this comparison, if the latter is smaller than the former, the control element 15 determines that the data file defined by the present instruction data cannot be allocated in the data memory 16 and sends response data indicating an abnormal size. Output and return to the instruction data waiting state.

As a result of the comparison, if the former is equal to or smaller than the latter, the control element 15 determines that the data file defined by the present instruction data is to be allocated in the data memory 16 and the head address information in the data file definition information is determined. Generate The generation of the head address information can be obtained by internally calculating using the value in the total data file allocation head address storage unit 32 and the file size information in the present instruction data.

Thus, when the head address information is generated, the control element
15 generates data file definition information based on the data file name, access condition information, file size information, and the generated top address information in the instruction data,
If there is already stored data file definition information, it is stored next. In this case, the data file is 1
If none is defined, the data memory 16
The data file definition information is stored starting from the first address.

After storing the data file definition information, the control element
15 rewrites the value in the total data file allocation start address storage unit 32 with the head address information stored this time, and subtracts the previously calculated result 1 from the value in the data file unallocated size storage unit 31; The result is stored in the data file unallocated size storage unit 31 as new data file unallocated size information. Then, the control element 15 outputs response data indicating the completion of the data file definition, and returns to the instruction data waiting state.

According to such processing, as shown in FIG. 2, the data file definition information 24 is sequentially stored in the area provided for the data file allocation as the data memory 16 from the smaller address. The data files 21 and 22 defined by the file definition information 24 are defined sequentially from the one with the largest address.

Next, a data file selection process will be described. As a result of the determination as to whether the data file definition command data is not data file definition command data, the control element 15
Next, it is determined whether or not the data is the data file selection command data as shown in FIG. If the result of this determination is not data file selection instruction data, control element 15 proceeds to a process of determining that it is another instruction data.

As a result of the determination of the command data, if the command data is the data file selection command data, the control element 15 finds the data file definition information having the same data file name as the data file name in the command data from the data memory 16. If not found, the control element 15 outputs response data indicating that the data file has not been defined, and returns to the command data waiting state.

If found, the control element 15 stores the data file definition information in a built-in RAM (not shown), outputs response data indicating completion of data file selection, and returns to the command data waiting state.

Next, an area definition process will be described. If the result of the determination as to whether or not the data file selection command data is not data file selection command data, the control element 15
It is determined whether the data is the area definition command data as shown in the figure. If the result of this determination is that the data is not area definition command data, the control element 15 proceeds to a process of determining that it is another command data.

As a result of the determination of the command data, if the data is the area definition command data, the control element 15 first refers to the data file definition information stored in the RAM at the time of selecting the data file, thereby obtaining the application data file 22. It is determined whether or not is selected. As a result of this determination, if the application data file 22 is not selected, the common data file 21 is selected, and if the application data file 22 is selected, the common data file 21 and the selected application data file 22 are selected. By referring to each of them, area definition information having the same area number (AID) as the area number (AID) in the instruction data is found. If found, the control element 15 outputs response data indicating the existing area number and returns to the command data waiting state.

If not found, the control element 15 next adds the number of bytes (size information) of the area definition information to the area size information in this instruction data, sets the result to result 2, and sets the area undefined in the data file definition information. Compare with the allocated size information. At this time, if the application data file 22 is not selected, the common data file 21
Target area unallocated size information in the data file definition information that defines the application data file 22. If the application data file 22 is selected, the area unallocated size in the data file definition information Target allocation size information.

As a result of the above comparison, if the latter is smaller than the former, the control element 15 determines that the area defined by the present instruction data cannot be allocated in the present data file, and outputs response data indicating an abnormal size. To return to the instruction data waiting state.

As a result of the comparison, if the former is equal to or smaller than the latter, the control element 15 determines that the area defined by the instruction data is allocated in the data file, and generates the head address information in the area definition information. I do. The generation of the head address information can be obtained by internally calculating using the total area allocation start address information in the data file definition information and the area size information in the present instruction data. At this time, if the application data file 22 has not been selected, the total area allocation start address information in the data file definition information defining the common data file 21 is targeted, and the application data file 22 is not selected. If so, the target is the total area allocation start address information in the data file definition information defining the application data file 22.

Thus, when the head address information is generated, the control element
15 generates area definition information from the area number, access condition information, area size information, and the generated start address information in the instruction data, and if there is already stored area definition information, Remember.
In this case, when no area is defined, the area definition information is stored from the start address of the data file.

When the storage of the area definition information is completed, the control element 15 rewrites the total area allocation start address information in the target data file definition information with the head address information stored this time, and sets the target data file definition information. Is subtracted from the previously calculated area unallocated size information, and the result is stored as new area unallocated size information. Then, the control element 15 outputs response data indicating the completion of the area definition, and returns to the instruction data waiting state.

According to such processing, the defined data file
As shown in FIGS. 4 and 5, area definition information 27 and 30 are sequentially stored in the areas 21 and 22 in ascending order of address. Areas 25 and 28 defined by the area definition information 27 and 30 are They are defined sequentially from the one with the largest address.

Next, the area processing (reading and writing of data in the area) will be described. As a result of the determination as to whether or not the area definition command data, if not the area definition command data, the control element 15
Next, it is determined whether the data is read command data as shown in FIG. 11A or write command data as shown in FIG. 11B. If the result of this determination is not area processing instruction data as shown in FIG. 11, the control element 15 outputs response data indicating an abnormality in the instruction data, and returns to the instruction data waiting state.

As a result of the determination of the command data, if the data is the area processing command data, the control element 15 first refers to the data file definition information stored in the RAM at the time of selecting the data file, thereby obtaining the application data file 22. It is determined whether or not is selected. As a result of this determination, if the application data file 22 is not selected, the common data file 21 is selected, and if the application data file 22 is selected, the common data file 21 and the selected application data file 22 are selected. By referring to each of them, area definition information having the same area number (AID) as the area number (AID) in the instruction data is found. If not found, the control element 15 outputs response data indicating that the area is undefined, and returns to the command data waiting state.

If found, the control element 15 obtains information such as where the target area is located in the memory from the area definition information, and reads or writes the area. Then, after the end of the area processing, the control element 15 outputs the processing result as response data, and returns to the instruction data waiting state.

In this way, the means for selectively specifying each defined data file is provided, and by defining a plurality of areas only for the specified data file, the order in which the data files are defined is externally recognized. Without doing this, it is possible to select a data file at random and use it as a data file for area definition. Therefore, IC
The load on the card issuing system is reduced.

In addition, it has means for selectively specifying a plurality of defined application data files, defining a plurality of areas only for the specified application data file, and defining a plurality of areas when no application data file is specified. By defining multiple areas for common data files only, the order in which the data files were defined is not recognized externally, and the common data file is numbered or defined in each data file. It is not necessary to recognize the number of areas outside. Also, the sequence for defining an area in each data file can be the same as the sequence for accessing a normal area. Therefore, the load on the IC card issuing system is reduced.

Further, instead of externally identifying and operating one data file as a common data file, the identification is performed inside the IC card, so that the common data file among the plurality of data files can be externally identified. No special identification and access required by the application. Therefore, the load on the application system is reduced.

In the above-described embodiment, the data file definition information is sequentially stored in the data memory in ascending order of address, and each data file defined by the data file definition information is sequentially defined in ascending order of the address. That is, the data file definition information may be stored sequentially from the larger address, and each data file may be defined sequentially from the smaller address. The same applies to the storage of area definition information and the definition of areas in each data file.

[Effects of the Invention] As described in detail above, according to the portable electronic device of the present invention, the data file can be read without externally recognizing the order in which the data file is defined and the number of areas defined in the data file. The data file can be selected at random and set as an area definition target data file, thereby reducing the load on the issuing system that issues this apparatus.

Further, according to the portable electronic device of the present invention, it is not necessary to specially identify the common data file among the plurality of data files by the external application and access the common data file, thereby reducing the load on the application system.

[Brief description of the drawings]

1 is a flowchart for explaining each processing operation, FIG. 2 is a diagram showing a data file structure in a data memory, and FIG. 3 is a data file definition. FIG. 4 is a diagram illustrating information, FIG. 4 is a diagram illustrating an area structure in a common data file, FIG. 5 is a diagram illustrating an area structure in an application data file, FIG. 6 is a diagram illustrating area definition information, FIG. FIG. 8 is a diagram illustrating a data file unallocated size storage unit and a total data file allocation start address storage unit. FIG. 8 is a diagram illustrating a format example of data file definition command data. FIG. 9 is a format of a data file selection command data. FIG. 10 is a diagram showing an example, FIG. 10 is a diagram showing a format example of area definition command data, and FIG. 11 (a) is a diagram showing a format example of read command data to an area. FIG. 11 (b) is a diagram showing a format example of write instruction data to an area, FIG. 12 is a block diagram showing a configuration of an IC card, FIG. 13 is a diagram showing functional blocks of the IC card, FIG. 14 is a block diagram showing a configuration of a terminal device. 1 IC card (portable electronic device), 15 control element (control section), 16 data memory (memory section), 17
Program memory, 21 ... Common data file, 22 ...
... application data file, 24 ... data file definition information, 25, 28 ... area, 27, 30 ... area definition information.

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-204493 (JP, A) JP-A-62-276683 (JP, A) JP-A-63-108445 (JP, A) 226391 (JP, A) JP-A-62-251990 (JP, A) JP-A-63-138482 (JP, A)

Claims (3)

(57) [Claims] An information processing apparatus includes: a common data file commonly used by a plurality of applications; and a plurality of second data files used by each application, and each data file is divided into a plurality of areas. The common data file stores identification information of each area in the common data file, and the second data file stores identification information of each area in the second data file. A memory storing the data, data file defining means for defining the common data file and the plurality of second data files with respect to the memory; A first means for selecting one of the following, and an area for additionally defining an area in the file by the instruction data inputted from the outside. Second means for determining whether or not the instruction is an area definition instruction including the identification information of the area and the size information of the area; and when the second means determines that the instruction is an area definition instruction, The area definition information having the same identification information as the area identification information in the area definition command is stored in the first area.
A third means for determining whether or not the file already exists in the file currently selected by the means, and the definition information of the area having the same identification information being selected by the third means. If it is determined that the area information does not already exist in the file, the address information of the area additionally defined by the area definition instruction is generated.
Means, if it is determined by the third means that an area having the same identification information does not already exist in the memory, the identification information of the area in the area definition command and the area Fifth means for generating area definition information comprising size information and address information of the area generated by the fourth means, and storing the area definition information in a file currently selected by the first means; If it is determined by the third means that the area definition information having the same identification information as the area identification information in the area definition command already exists in the memory, the same identification information 6. A portable electronic device, comprising: sixth means for outputting response data indicating that an area having the above already exists. 2. A data processing system comprising: a common data file commonly used by a plurality of applications; and a plurality of second data files used by each application, and each data file is divided into a plurality of areas. The common data file stores identification information of each area in the common data file, and the second data file stores identification information of each area in the second data file. A memory storing the data, data file defining means for defining the common data file and the plurality of second data files with respect to the memory; A first means for selecting one of the following, and an area for additionally defining an area in the file by the instruction data inputted from the outside. Second means for determining whether or not the instruction is an area definition instruction including the identification information of the area and the size information of the area; and when the second means determines that the instruction is an area definition instruction, It is determined whether or not area definition information having the same identification information as the area identification information in the area definition command already exists in the common data file and the file currently selected by the first means. A third means for determining, and if the third means determines that the definition information of the area having the same identification information does not already exist in the memory, the information is added by the area definition instruction. A fourth means for generating address information of an area to be defined; and if the third means determines that an area having the same identification information does not already exist in the memory, Defined life Generate a size information of the identification information and the area for the area in, the area definition information comprising address information of the generated area in the fourth means,
When the second data file is selected by the first means, the area definition information is stored in the selected second data file, and the second data file is stored by the first means.
And a fifth means for storing the area definition information in the common data file when the data file is not selected. 3. A data file having a common data file commonly used by a plurality of applications and a plurality of second data files used by each application, and each data file is divided into a plurality of areas. The common data file stores identification information of each area in the common data file, and the second data file stores identification information of each area in the second data file. A memory storing the data, data file defining means for defining the common data file and the plurality of second data files with respect to the memory, and externally input instruction data additionally defining a second data file Data file identification information and data file definition information including the size information of the data file. First means for judging whether or not the data file is defined as a data file definition command. If the first means determines that the command is a data file definition command, address information of a file additionally defined by the data file definition command is added. Second means for generating, file definition information comprising file identification information and size information of the data file in the data file definition command, and address information of the data file generated by the second means Generate and store in memory 3
Means for selecting one of the plurality of second data files based on a selection command including identification information of the data file from the outside, and command data input from the outside in the file A fifth means for determining whether or not the area definition command includes area identification information for defining an additional area and size information of the area; and an area definition command by the fifth means. If it is determined that there is an area, the area definition information having the same identification information as the area identification information in the area definition command is stored in the fourth area.
Means for judging whether or not the file already exists in the file currently selected by means of the means, and the definition information of the area having the same identification information is now selected by the sixth means. Means for generating address information of an area additionally defined by the area definition instruction when it is determined that the area does not already exist in the file, and identification of the area in the area definition instruction Generates area definition information including information, size information of the area, and address information of the area generated by the seventh means, and stores it in the file currently selected by the first means. Eighth means, and ninth means for judging whether or not the command data inputted from the outside is a processing command for an area including identification information of the area for accessing the area in the file and command information. And if the ninth means determines that the command is an area processing command, and if one of the second data files is currently selected by the fourth means, Finding an area having identification information specified by the area processing instruction in the second data file, and if one of the second data files is not currently selected by the fourth means, Tenth means for finding an area having the identification information specified by the area processing instruction in the common data full; and eleventh means for accessing the area found by the tenth means. A portable electronic device characterized by the following.