JPS6154583A - Ic card - Google Patents

Abstract

PURPOSE:To attain the improvement of productivity, the protection of secrecy for each user's program and the increase of application, by setting a program area to an external memory for data provided in a card and writing freely the desired processing programs. CONSTITUTION:An user tries to have a function to add a password, for example, when an IC card 10 is initialized. In this case, the relevant program is produced in an interpretation language and supplied through a terminal equipment 40 to be transferred to the card 10. While the card 10 contains previously the programs for check of the communication and the communication data, the writing of the user program to an external memory 30, etc. written to an internal memory 26 of a microcomputer 20. Then data are received from a terminal by the user program, and the information is processed or the data are transferred to the equipment 40. In addition, a new password function can be freely added together with free ciphering. Furthermore the electrical erasion is possible by using an EEPROM as the memory 30.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an IC card incorporating an integrated circuit (hereinafter referred to as IC) for storing information.

, <Prior art> Replaces magnetic cards. As a next-generation card, a so-called IC card, which has a 1C chip built into the card that has excellent information processing functions and information storage capacity, is attracting attention.

Usually, in an IC card, a program for writing and reading necessary data is written into the internal memory of a microprocessor within the card before the card is manufactured.

Although program creators try to take into consideration the usage patterns of a wide variety of users, preparing a program that is compatible with all application computers will result in a very complex program and a large amount of memory. This is difficult due to issues such as limited capacity.

We are also considering an easy-to-order IC card program that allows you to divide the memory area, specify the presence or absence of a password for each area, and add other functions at the card initialization stage. However, in a program using this method, it is necessary to prepare a part of the program that will no longer be used by specifying one of them, and this part of the program will remain unused even after the specification is made. However, since there are two types of memory, there is a drawback that the limited memory area cannot be used effectively.

<Problems to be solved by the invention> The present invention has been made in response to one or more current situations, and
After the C card is assembled, the user can
A 10-card card is provided in which a program area is set in an external memory for data in an IC card so that necessary processing programs can be freely written.

Means and operation for solving the problems> The present invention will be explained in detail below with reference to the drawings.

As shown in FIG. 2, the IC card has an external memory (f30) of a microcomputer built into the card at an appropriate position. It is connected to an external terminal device through a terminal so that necessary information can be exchanged and processed.

FIG. 1 is an explanatory diagram showing a block diagram of an IC card related to the present invention. Referring to FIG. 1iIj, the microcomputer (201 connects the terminal t=io
+ Basic processing programs such as a communication program to execute communication with the external memo IJ (30), a check program to check whether the information at the time of communication is correct, and a confidentiality program to maintain the confidentiality of passwords etc. are pre-installed. There are four internal memories being written. Further internal notes! / (A C'PUI 24J that executes necessary processing using 261 programs, etc., and other interfaces are provided.

The external memory I3α located alongside the phycrocomputer (2I) uses P-ROM.1 According to the present invention,
Two areas are set: a knee program area IJlr in which a user can freely write a program that performs necessary processing, and a data area (34) in which desired data can be written.

The terminal (41 is an IC card (10) via the terminal (221)
) to write data, programs, etc. to the external memory (to), or to write data, programs, etc. to the internal memory (lj-C30)
This is a device that reads the data and executes display control according to the PFI settings. ----Next, more specific operations will be explained based on the flowchart of FIG.

A microprocessor can interpret programs written in an interpreted language and perform the necessary processing. Therefore, if a user wants to provide a function for adding a password, for example, when initializing an IC card, he or she creates a program using an interprinter language. An example of an interpreted language is TI.
There are languages such as NYBASIC, but it is sufficient to use a language suitable for each microprocessor.

Next, input this program from the terminal device (4 (m),
It is to be transferred to the C card (IO). IC card (
In lot, check the communication 1 communication data mentioned above.

External memory (301) for user programs according to the present invention
Programs such as writing to a microcomputer
By writing in advance to the internal memory port of @, C
A desired user program is written to the external memory IJ-C3G through P U (2(1).

First, the IC card receives power from the terminal device at Nutenop S1, and then receives the sent signal at Nutenop S2, thereby bringing the IC card into an initial state.

In this state, communication preprocessing in Nutep s3 is performed. 1- That is, initial settings such as transmission speed, transmission format, guard time, block size, etc. are measured.

Next, a command is sent from the terminal, but the external memory (
The IC card recognizes whether the command is a data processing command to write data to or read data from the data area (to), or a command to write a user program to the user program area of the memory. There is a need. For this reason, an identification mark such as P or °C is placed at the beginning of the sent command for data processing or user program writing. Then, this identification mark is removed by the microprocessor (2 (11) in step S12 in the IC card,
In the next step 813, the first command is sent to the primary depending on whether D or P (it is determined whether the command is for data processing or kneeserv program writing).

By the way, if the address of the external memory (30) is 100, for example
If there are addresses, set internal memo that the first 30 addresses correspond to the area for writing the user program, and the next 61 to 1oo addresses correspond to the area for writing data. IJ-CI! 61. Then, when the user program is written in the user program according to the procedure described later, a mark indicating the completion of knee server program writing is placed at the final address of the user program area.

Therefore, after step S13, the IC card reads the external memory and checks the end mark of the user program to determine whether it is a corner or not.

When it becomes 1YEsj in step 813, step S i
Proceed to step 4, and if the user program has already been written to the external memory, in step S15, a status indicating that program loading is not permitted is sent to the terminal device + El-ID so that the user program is not written twice. becomes. If the program is not stored in the external memory, step S9
In order to maintain confidentiality, the internal memory (2Gl has a password function for writing user programs),
Check the password sent from the terminal,
If the password is not OK, the process proceeds to step sis, but if the password is OK, in step S10, the baraki-in of the user program sent from the terminal device is controlled by the basic processing program of the internal memo IJ tai+. Then, writing is executed sequentially from the first address to the preset user program area country of the external memory (to). In this example, the knee server program is TIN
Since it was written in Y BASIC language, I just changed it to T.
Execute "INY BASIC language state." When the writing is completed 7-J-, a loaded mark is set at the final address of the user program area in step S11.

Next, in step S16, a signal is sent to the terminal device as to whether or not the information transmission is finished, and based on the response, it is determined whether or not it is finished, and if processing such as data storage is to be continued, a "No" decision is made. is performed, and the process returns to step S12.
The following processing is executed.

Next, in step S13, if the first command is not a user program writing command, step s
Proceed to step 4. Here, as in step S14, if the user program is not written in the user program area Oa of the external memory (7), the status of writing the user program in red is sent to the terminal device in step s17, and the process ends. If a user program has been written, addresses corresponding to user program books 1 and 17 in external memory 00 are called in step S5. The MPU implemented this time has a translation function for TINY l3ASIC, which is the interprinter language, and the user program is translated into machine language in step s6, and execution processing based on the user program is performed in step s8. . That is, data area 04
When data is written to, it is executed according to the procedure of the user program.

In this way, this user program receives and receives data from the terminal and processes the information.

Data can then be transferred to a terminal device.

Additionally, users can freely add new password functions, check codes, and perform encryption using the user program.

Furthermore, if EEPPOM is used as an external memory (C30), it can be electrically erased, so the user program can be changed and improved, so the same IC card can be used for different applications,
It becomes possible to deal with changes, etc.

<Effects of the Invention> Since the present invention achieves the above advantages, it produces the following distinct effects.

In other words, the card manufacturer can first mass produce cards containing the basic processing program, and later store the town duram for each user separately on the IC card, contributing to improved productivity. Furthermore, since each user can later store his or her own program on the IC card, the program can be kept confidential, which can be expected to widen the range of applications.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an IC card for implementing the present invention, FIG. 2 is a schematic diagram of the IC card, and FIG. 6 is a flowchart for implementing the present invention. tlol...IC card (2υ)...Microphone computer (MPU)]22)...Terminal
Sill+...CPU S1:)...Internal memory (3
U)...External memory I3 Misaki...Nice program area c341...Data area rlUl...Terminal Figure 2

Claims (1)

[Claims] 1) An IC card incorporating an external memory and a microcomputer for writing and reading information to and from the memory, wherein the external memory includes a user program area and a data area. Set up two areas and run the user program.
A user program writing means for writing to the user program area; and a data area control means for writing data to the data area on the same external memory based on the user program. IC card.