JP3152349B2 - IC card system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an IC card system, for example, for storing data,
Regarding an IC card system comprising an IC card that can be processed and a reader / writer that performs data communication with this IC card, particularly a plurality of types of IC cards having different purposes and applications such as bank cards and credit cards With a single reader / writer, and a sufficient security assurance of a communication control program.

<Conventional technology> Conventionally, an IC card system, for example, stores data,
It has an IC card that can process and a reader / writer that exchanges data with the IC card. And this IC card had a CPU, a ROM, a RAM, and an interface. Also, even if you have a reader / writer,
It had a CPU, ROM, RAM, and interface. Furthermore,
Some of these IC cards and reader / writers have input / output means such as a keyboard and a display.

Then, in this IC card system, in the reader / writer, the CPU executes an application program stored in the ROM by keyboard input.

That is, the CPU of the reader / writer transmits a predetermined command to the IC card according to the program.

The IC card executes the command processing program stored in the ROM in response to the command, processes the data stored in the memory, and transmits the processing result to the reader / writer.

In this case, the application program was written in the assembler language, and its commands were also written in the assembler language. As a result, in the reader / writer, the keyboard input is converted into a machine language by an assembler and executed. In the case of executing a command processing program in an IC card, a received command is converted into a machine language by an assembler to process data.

Therefore, in this reader / writer, a communication control program has been developed corresponding to the purpose of use, for example, the purpose as a credit card. In addition, even in the case of an IC card, a command processing program for a credit card system was developed and used.

Therefore, when the reader / writer and the IC card are used for other purposes and purposes, for example, a bank card system, a dedicated communication control program and a command processing program suitable for the purpose are developed in an assembler language. Had to be built into the ROM. In the case of a reader / writer, for example, it was replaced as a ROM cartridge.

<Problems to be Solved by the Invention> However, in such a conventional IC card system, since an assembler is used, when this system is used for a plurality of purposes and applications, communication is performed for each of them. There is a problem that a control program is required, and it takes a lot of time to develop the program and to incorporate the program. As a result, a great economic burden is imposed on the user of the system.

In addition, there is a problem in security assurance of the communication control program, such as easy removal of the cartridge ROM.

Accordingly, an object of the present invention is to provide an IC card system that can easily modify and change various communication control programs.

<Means for Solving the Problems> In order to solve the above problems, the present invention provides an IC card including a plurality of types of IC cards having different purposes of use and applications, and a reader / writer for exchanging data with the IC card. In the system, the IC card stores a program for processing the IC card, such as communication of the IC card in a BASIC language or the like, an application, and the reader / writer includes an interpreter of the language, and the program is transmitted to the reader / writer. The present invention provides an IC card system in which a program for processing an IC card, such as communication and an application, can be changed corresponding to a plurality of types by interpreting and executing by the interpreter.

<Operation> In the IC card system according to the present invention, the reader / writer stores an interpreter in a ROM, for example. The interpreter monitors an input from a keyboard, a floppy disk driver, an IC card, or the like via an input means (interface). If this input is a direct executable statement in the interpreted language, the interpreted language is interpreted and executed. Processing such as specifying a ROM address is performed.

<Example> Hereinafter, an example of an IC card system according to the present invention will be described in detail with reference to the drawings.

1 to 4 show an embodiment of an IC card system according to the present invention.

As shown in FIG. 1, in this reader / writer, reference numeral 10 denotes an MPU (microprocessor) incorporating an interpreter. That is, the MPU 10 has a CPU (central processing unit) 11, a ROM 12 with a built-in program, a RAM 13 for temporarily storing data and the like, and an interface 14. The ROM 12 stores a BASIC interpreter.

For example, when a 16 KB memory capacity is used as an IC card, this interpreter has about 5K steps.

Reference numeral 21 denotes a rewritable memory (EEPROM) for storing a program written in an interface language such as BASIC. Therefore, an application program of an external function (such as an IC card) is downloaded to the memory 21 by the interpreter of the MPU 10.

Reference numeral 22 denotes an LCD driver for displaying characters and the like on a screen for a display output device such as an LCD.
The LCD driver 22 is controlled by an output signal from the MPU 10.

Reference numeral 23 denotes an external input / output driver, for example, a floppy disk driver. Through this driver 23, the MPU 10 exchanges data with an external input / output device such as a floppy disk.
Transmission and reception of signals such as programs can be performed. Also,
The IC card exchanges data with the reader / writer via the driver 23.

Reference numeral 24 denotes a keyboard as an input device for the MPU 10. This can be a mouse or the like.

 25 is a buzzer and 26 is a battery.

 Next, the operation of the present embodiment will be described.

FIG. 2 is a flowchart showing the operation of the MPU 10 according to this embodiment.

First, an interpreter built in the MPU 10 is executed (Step S1). That is, the power of the reader / writer is turned on.
The interpreter program held in ROM12 by this R
The data is loaded from the OM 12 to a predetermined user area of the RAM 13.

This means that the interpreter is resident in the MPU 10. That is, the interpreter program is ready to be executed thereafter.

Next, the management program built in the MPU 10 is executed (S2).

Next, the external input / output device is initialized (S3). As a result, a command input from the external input / output device, for example, the keyboard 24, the floppy disk driver 23, or the like to the management program is awaited.

Next, when a management program command is input from an external input / output device (for example, the keyboard 24) (S4), it is determined whether or not the input command is "R" (S5).

If it is "R", the application program stored in the ROM 12 is executed correspondingly (S6).

If it is not "R", it is determined whether or not "E" has been input as a command (S7). If it is "E", an editor program is executed (S8).

If it is not "E", it is determined whether or not the command is "Q" (S9). If it is not "Q", the process returns to the state of waiting for input. In the case of "Q", this program ends.

If it is "R" in step S5, a subroutine program for LCD display is executed as shown in FIG. 3 (S6). This subroutine will be described.

 First, each input / output driver 23 is initialized (S11).

Next, a message of "waiting for key input" is output so as to be displayed on the LCD (S12).

Next, a state of waiting for a key input from the keyboard 24 is entered. If the keyboard 24 is pressed (S13), it is checked whether or not this key is the END key (S14).

If it is not the END key, this input character is output and displayed on the LCD (S15). Then, the buzzer sounds for 0.5 seconds (S16). Thereafter, the subroutine ends, and a key input wait state of the main routine is entered.

If the input command is "E" in step S7, the editor program in the management program is executed. This editor program creates, modifies, and edits a source program, and has functions such as addition, deletion, and modification.

In this subroutine, first, as shown in FIG.
When an editor command is input (S21), a list (LIS
T) It is determined whether the command is a command (S22).

If the command requests list output, the number of lines specified from the current line is output to the external input / output device (S23). The program list stored in the memory is displayed on the display.

Next, if it is not a list command, it is checked whether it is a correction command (S24).

If a correction command has been input, the current line of the program list displayed on the LCD is corrected. After compiling, the program is compiled (S25).

If it is not a correction, determine whether it is a delete command (S2
6) If so, delete the specified number of lines from the current line (S27). By specifying the line number to be deleted, the line is deleted from the memory in units of lines.

If not, it is checked whether or not to download (S28). If it is desired to download, the program input from the external input / output device is inserted before the current line (S29). This program is compiled after downloading.

Then, if it is not a download, it is checked whether or not to end, and if so, the operation is ended (S30).

After steps S23, S25, S27, and S29, the process returns to the state of waiting for input of an editor command (S21).

Further, the input means is not limited to only the keyboard as shown in the above embodiment, but may be a floppy disk or the like.
There is a card. The portability of the present invention is further expanded by porting the programs loaded on these to the MPU of the reader / writer.

For example, all data and programs
It shall be stored in ROM. That is, the ROM stores a program created in the BASIC language.

On the other hand, the reader / writer has a built-in interpreter built into the OS, and the above IC written in BASIC
The program of the card is interpreted and executed line by line by the interpreter.

In this manner, a single reader / writer can accept a plurality of types of IC cards simply by exchanging the IC cards. The IC card controls the reader / writer.

In the above embodiment, the basic interpreter has been described. In addition, a program is created in C language, PL-1, Kobol, Fortran, or a compilable basic language, or a language of a similar level. This program may be compiled to an object code level, and this program may be stored in an EEPROM or downloaded from the outside, and may be operated by an interpreter written in an assembler.

<Effects> As described above, in the IC card system according to the present invention, it is not necessary to develop and install a communication control program for each of different purposes and uses, and to achieve the purpose and uses easily. Can be changed and installed.

Further, there is no need to impose a great economic burden on the user of this data processing apparatus for program development.

In addition, the security of the communication control program in this case is sufficient.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an IC card system according to one embodiment of the present invention, FIG. 2 is a flowchart showing an operation procedure of an MPU according to one embodiment of the present invention, and FIG. Flowchart showing a subroutine, fourth
FIG. 9 is a flowchart showing a subroutine. 10 …… MPU 11 …… CPU 12 …… ROM 13 …… RAM 14 …… I / O

Continuation of the front page (56) References JP-A-62-54334 (JP, A) JP-A-63-127351 (JP, A) JP-A-1-29051 (JP, A)

Claims (1)

(57) [Claims] 1. An IC card system comprising a plurality of IC cards having different purposes and uses and a reader / writer for exchanging data with the IC cards. And the like, and a program for processing the IC card is stored. The read / writer is provided with an interpreter of the language, and the program is sent to a memory (RAM) of the reader / writer, and interpreted and executed by the interpreter. Depending on the type, send a program for processing each IC card such as communication and application to the memory (RAM) of the reader / writer, and if the program sent to the memory (RAM) needs to be edited with the reader / writer, An IC card that can be created, edited, and modified by executing an editor program stored in the ROM of the reader / writer Card system card.