JPS636690A - Portable electronic device - Google Patents

Abstract

PURPOSE:To newly add a function program and to execute the program by providing the titled device with a means for additionally storing the function program to be added by a specific function code in a program memory part. CONSTITUTION:An IC card as a portable electronic device is constituted of a control element 15 to be a control part, a non-volatile data memory 16 capable of erasing its stored contents as a data memory part, a program memory 17 as a program memory part, and a contact part 18 for obtaining electric contact with a card reader/writer. A function program to be added by a specific function code is additionally stored in the program memory 17.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention provides an IC (integrated circuit) chip having a non-volatile data memory and a control element such as a CPU (central processing unit). Built-in so-called I
It relates to a portable electronic device called a C-card.

(Prior Art) Recently, an IC card has been developed as a new portable data storage medium, which includes a built-in IC chip having a non-volatile data memory and a υJll element such as a CPU. This IC card reads, writes, or erases data from a built-in data memory using an internal control element.

Usually, the control element is controlled by a built-in control program. That is, when command data is input from an external device, the decoding program in the subprogram is executed, the function program corresponding to the input command data is searched and executed, and the result is then sent to the external device as response data. Output to.

By the way, in conventional IC cards, the function program is stored in advance in a program memory configured with a mask ROM in the control element or in a program memory configured with a mask ROM existing outside the control element. . For this reason, for example, if a functional program for encrypting data is stored in an IC card,
The encryption method cannot be changed. In addition, when adopting individual encryption methods depending on each need, a control program for each need must be incorporated into the IC card.
Not suitable for childbirth. Furthermore, each needs to disclose the encryption method used to the card manufacturer. Therefore, there has been a strong demand for a technique for newly storing and executing another ocular performance program in addition to the stored functional programs.

(Problems to be Solved by the Invention) As described above, there has been no technique for newly storing another functional program in a previously stored functional program pool and executing it.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a portable electronic device that can newly store and execute another functional program in addition to previously stored functional programs.

[Structure of the Invention] (Means for Solving the Problems) The portable electronic device of the present invention stores a correspondence table between the start address of each function program and a function code for executing the program in a data memory. In addition, it has a means for additionally storing a function program to be added using a specific function code in the program memory section, and the head address of the additionally stored function program and the function code for executing it are stored in the correspondence table. It is characterized by adding corresponding data.

(Function) As a result, a function program created by the user can be arbitrarily stored in the program memory section from the outside, and the performance program can be executed according to a normal sequence.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 14 shows an IC as a portable electronic device according to the present invention.
This figure shows a configuration example of a card collecting device used as a terminal device in a home banking system or shopping system to which a card is applied.

That is, this device connects the IC card 1 to a card reader.
In addition to making it possible to connect to the control section 3 consisting of a CPtJ etc. through the writer 2, the control section 3 is equipped with a keyboard 4, a CRT, etc.
It is constructed by connecting a display device 5, a printer 6, and a floppy disk device 7.

The IC card 1 is held by the user and is used to refer to a personal identification number known only to the user when purchasing a product, for example, and to store necessary data. Its functional blocks are shown in Fig. 13. It is comprised of parts that execute basic functions such as a read/write part 11, a password setting/password verification part 12, and an encryption/decryption part 13, and a supervisor 14 that manages these basic functions. . Lead
The write section 11 has a function of reading, writing, or erasing data from/to the card reader/writer 2. The password setting/password verification unit 12 has a function of storing the password set by the user and prohibiting repeated use of the password, as well as verifying the password after setting the password and granting permission for subsequent processing. The encryption/decryption unit 13 performs encryption and encryption of encrypted data to prevent leakage and forgery of communication data when transmitting data from the control unit 3 to another terminal device via a communication line, for example. It performs decoding, for example, DES (Data Encryption).
This function performs data processing in accordance with an encryption algorithm having sufficient cryptographic strength, such as encryption standard>. The supervisor 14 has the function of decoding the function code input from the card reader/writer 2 or the function code to which data is added, and selecting and executing a necessary function among the basic functions.

In order to perform these functions, the IC card 1 has a control element (for example, a CPU) 15 as a control section and a non-volatile memory whose storage contents can be erased as a data memory section, as shown in FIG. 12, for example. It is composed of a data memory 16, a program memory 17 as a program memory section, and a contact section 18 for obtaining electrical contact with the card reader/writer 2. The memory 16 and program memory 17) are composed of one IC chip. The program memory 17 is composed of, for example, an EPROM or an EEPROM, and, as shown in FIG. 2, stores a control program for the control element 15, which includes a function program for realizing each of the basic functions. It is. The data memory 16 is used to store various data and is composed of, for example, an EEPROM.

The data memory 16 is divided into a plurality of areas v1 as shown in FIG. 3, for example, and each area is assigned an area number C0O-FFI. this house,
In area [00], the start address of each of all areas and the number of bytes constituting the area are stored in correspondence with the area number. For example, the start address of area [02] is Ao2 address, and the number of bytes making up the area is SO2 bytes.

Further, in area "01", as shown in FIG. 4, the start address of each of the function programs is stored in correspondence with the function code. For example, the start address of a program that implements function code rBJ corresponds to rbbbJ. Zarani, area "00" or "01"
There is an area for storing the final address of the functional program group. In this example, "1iiJ corresponds to the final address.

Next, the operation in such a configuration will be explained.

First, the IC card 1 operates according to the flowchart shown in FIG. That is, in the steady state, it is in a state of waiting for command data from the card reader/writer 2. When command data is input from the card reader/writer 2, the control element 15 executes basic functions according to the command data, outputs the response data to the card reader/writer 2, and returns to the initial command data waiting state. . In this case, a function code in the input command data is added to the response data, and protective measures are taken in case the sequence with the card reader/writer 2 is disturbed.

The command data output from the card reader/writer 2 to the IC card 1 has a format as shown in FIG. 6, for example, and may be in the form of only a function code as shown in FIG. As shown in b), there is a form in which data is added to the function code.

Next, the specific operation of the IC card 1 will be explained with reference to the flowchart shown in FIG. When the command data is input, the control element 15 uses a decoding program in the control program in the program memory 17 to extract the function code added to the command data. After that, the control element 15 stores the extracted function code in the data memory 1.
Search within area ``01'' of 6. If it is not found, the control element 15 outputs response data indicating a function code error and returns to the command data waiting state. If you find it,
The control element 15 extracts the start address of the corresponding functional program and jumps to the functional program. After executing the function program, the result is output as response data, and the state returns to the instruction data attendant state.

For example, in FIG. 4, for instruction data to which the code "C" is added as a function code, a function program starting from the address "CCC" is executed. Further, for example, if the function program starting from this address "CCC" is a data write function program, the function code "C" is associated with the data write function code.

Next, the operation of additionally storing a functional program based on external input will be explained with reference to the flowchart shown in FIG. When additionally storing a function program, function program addition command data having a format as shown in FIG. 8 is input. The function program addition command data is composed of a separate program addition code, function code addition data, and function program capacity data. When the function program addition command data is input, the control element 15 first refers to the function program capacity data in the command data, recognizes the content ω of the function program sent thereafter, and at the same time adds the function in the program memory 17. The capacity of the remaining free program area is recognized from the R end address of the program details, and it is confirmed whether all the input function programs can be stored. As a result, if all the data cannot be stored, the control element 15 outputs response data indicating overflow each time, and returns to the command data waiting state.

If it is determined that all data can be stored, the control element 15 then extracts the function code addition data from the command data and checks whether the same code exists in area "01" of the data memory 16. As a result of this check, if it exists, the control element 15 outputs response data indicating a function code addition data error and returns to the command data holding state. If it does not exist, the control element 15 stores the RAM (random) containing the extracted function code additional data.
- time is held in the access memory), outputs response data meaning that function program data reception is possible, and returns to the function program write command data waiting state.

Thereafter, the control element 15 inputs the functional program by inputting the functional program singly or in multiple batches according to the functional program writing instruction data consisting of the functional program B included function code and the functional program as shown in FIG. All are written immediately after the functional program group already stored in the program memory 17. If it is determined that all the functional programs have not been sent, the control element 15
outputs response data indicating that the function program data can be accepted, and returns to the state of waiting for function program write command data. If it is determined that all 70 grams of functions have been sent, the control element 15 HHs the start and end addresses of the function program added this time based on the final address of the function program group in the program memory 17. Then, the control element 15 first updates this final address as the final address of the functional program group. Next, the function code additional data previously held in the RAM and the added start address of the function program are combined and additionally written into the area "ol" of the data memory 16.

For example, if function program X is to be additionally stored, the corresponding function code is X. The state of the program memory l-' 17 additionally stored according to the above sequence is shown in FIG.
1'' is shown in FIG.

By storing in this manner, the added function program can be executed according to the sequence shown in FIG.

According to the IC card as described above, a function program created by the user can be arbitrarily stored in the program memory from the outside, and the function program can be executed according to a normal sequence. Therefore, it is possible to register a program having an algorithm specific to each application, and it is possible to fully cope with the mass production of IC cards.

In the above embodiments, the case where the IDlIIl element, the data memory, and the program memory are composed of one IC chip has been described, but it is not necessary that one IC chip
It does not need to be composed of C chips, and may be composed of separate IC chips.

Further, in the above embodiments, an IC card is used as an example of a portable electronic device, but the present invention is not limited to a card-shaped device, and may be, for example, a block-shaped or pencil-shaped device. Furthermore, the hardware configuration of the portable electronic device can be modified in various ways without departing from the spirit of the invention.

[Effects of the Invention] As detailed above, the present invention provides a portable electronic device that can newly store and execute another functional program in addition to the stored functional program. can.

[Brief explanation of the drawing]

The figures are for explaining one embodiment of the present invention, and FIG. 1 is a flowchart explaining the operation of additionally storing a function program, and FIG. 2 is a diagram showing the configuration of the program memory.
Figure 3 is a diagram showing the configuration of the data memory, Figure 4 is a diagram showing the correspondence between the number code and the start address of the function program, Figure 5 is a flowchart explaining the operation of the IC card, and Figure 6 is the card A diagram showing an example of the format of command data output from the reader/writer to the IC card, FIG. 7 is a flowchart explaining the specific operation of the IC card, and FIG. 8 is a diagram showing an example of the format of the d-function program addition command data. , FIG. 9 is a diagram showing an example of the format of the Kinou program write command data, FIG. 10 is a diagram showing the state of the additionally stored program memory, and FIG. 11 is the additionally stored data memory area "ol". 12 is a block diagram showing the configuration of the IC chip built into the IC card, FIG. 13 is a diagram showing the demon mask block of the IC card, and FIG. 14 is a block diagram showing the configuration of the card handling device. It is. 1... IC card (portable electronic 8 places), 2...
... Card reader/writer, 15 ... Control element (control section), 16 ... Data memory (data memory section), 17 ... Program memory (
program memory section). Applicant's representative Patent attorney Takehiko Suzue Figure 1 (b) Figure 2 Figure 3 Function code Start address of function program Figure 4 Figure 8 Figure 9 (a) Eco Figure 6 Figure 7 Figure 10 Figure 11r-1 Figure 12

Claims (5)

[Claims] (1) a data memory section; a control section for reading and writing data to the data memory section;
The control unit has a program memory unit that stores a control program for performing control, and the control program is classified into one or more control programs and one or more function programs, and the control program is classified into one or more control programs and one or more function programs. A portable electronic device that performs external input/output, comprising means for storing a function program input from the outside in the program memory section, and means for selectively executing the function program stored in the program memory section. A portable electronic device characterized by: (2) The portable electronic device according to claim 1, wherein the program memory section is located within the control section. (3) The portable electronic device according to claim 1, wherein the program memory section is located outside the control section. (4) The portable electronic device according to claim 1, wherein the data memory section is an erasable nonvolatile memory. (5) The portable electronic device according to claim 1, wherein the control section is a CPU (Central Processing Unit).