JPH0512511A - Ic card and method for changing application program for ic card - Google Patents

Abstract

PURPOSE:To make it possible to change an application program also in a using stage by including an electrically rewritable EEPROM in a memory device and storing an application program to be applied to a specific purpose in an IC card. CONSTITUTION:In the IC card provided with a CPU for controlling the whole IC card, the memory device 2a, 3, 4, 7 for storing data and various programs, an I/O port 5 for transmitting/receiving data between the IC card and an external apparatus, the memory device includes the electrically rewritable memory means 7 and the application program for applying the IC card to a specific purpose is stored in the memory means 7. In the case of changing the application program for the IC card, the application program is entered from the external apparatus and stored in the means 7. Then a program for commanding operation for updating and writing the application program is entered from the external apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC card capable of changing stored application programs and a method of changing the application programs.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a conventional IC card 10. In the figure, 1 is a CPU for controlling the entire IC card 10. Reference numeral 2 denotes a ROM, which stores a control program for controlling the IC card 10, an application program for applying the IC card 10 to a specific purpose, and data that is invariable in the use stage of the IC card 10.
Reference numeral 3 is a rewritable EEPROM for storing variable data in a use stage, 4 is a RAM for temporarily storing data in a use stage, 5 is an I / O port for transmitting / receiving data to / from an external device (not shown), A bus 6 is used for transmitting signals and data.

P1 to P5 are terminals used when connecting the IC card 10 to an external device, and P1 and P2 are power input terminals connected to the positive voltage side and the ground side of a power source provided in the external device. , The ground terminal. P3 is a reset signal terminal to which a reset signal for activating the IC card 10 is input, P4 is a clock terminal to which the operation clock of the CPU 1 is input, and P5 is an I / O port 5 for transmitting / receiving data to / from an external device. This is an I / O terminal used when performing.

Next, the conventional IC card 10 shown in FIG.
The operation of will be described. The application program created based on the specifications of the IC card issuer is the IC card 10
It is stored in the ROM 2 at the manufacturing stage. Also, IC
Various data, information, etc. at the use stage of the card 10 are stored in the I / O terminal P5 and the bus 6 according to the application program.
It is stored in the rewritable EEPROM 3 via.

[0005]

The conventional IC card 10
Since the above is configured and the application program is stored in the ROM 2, there is a problem that the contents of the application program cannot be changed or updated at the use stage of the IC card 10.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an IC card capable of changing an application program even in a use stage and a method of changing the application program. .

[0007]

In an IC card according to the present invention, a memory device includes electrically rewritable memory means, and an application program for applying the IC card to the memory means for a specific purpose. Is stored.

A method of changing an application program of an IC card according to another invention of the present invention is to take the application program from an external device and store it in an electrically rewritable memory device.

[0009]

In the present invention, the application program is stored in the electrically rewritable memory device.

In another invention of the present invention, the application program to be changed is loaded from an external device.

[0011]

1 is a block diagram showing a first embodiment of the present invention, in which 1, 3, 4 to 6, P1 to P5 are the same as those described above, and 10 'corresponds to 10. Reference numeral 2a is a ROM that stores a control program and data that is invariable depending on the use stage of the IC card 10 ', and 7 is an EEPROM that stores application programs and programs A ₁ and A ₂ (described later). ROM2a, EEPROM3, RAM4 and EE
The PROM 7 constitutes a memory device, and the EE
The PROM 7 constitutes a memory means included in the memory device.

Next, the operation of the first embodiment of the present invention shown in FIG. 1 will be described with reference to the flow chart shown in FIG. This operation is performed by the control program stored in the ROM 2a.

First, an external device (not shown) supplies a predetermined power to the power input terminal P1 and the ground terminal P2, supplies a clock signal to the clock terminal P4, and inputs a reset signal to the reset signal terminal P3. to activate the IC card 10 '(step S _1).

[0014] After the reset signal has passed a predetermined entered time, it is determined whether the control key has been entered by the operator of the IC card 10 '(Step S _2), if the control key is not input for a predetermined time period has elapsed Until (Step S
₃ ) Wait for the next control key input. If the predetermined time has elapsed in step S ₃ , the process proceeds to step S ₁₉ . When the control key is input in step S ₂ , the control key is compared with the data stored in the EEPROM 7 (step S ₄ ). If it is determined that the control key matches the data, the program A _1, that is, the application program erasing program is fetched from the external device side through the I / O terminal P5 and the I / O port 5 (step S ₅ ). If it is determined that the control key does not match the data, the process proceeds to step S ₁₉ .

Following step S ₅ , program A ₁
The data is written in a predetermined area of the AM 4 or the EEPROM 7 (step S ₆ ), the program A ₁ is executed (step S ₇ ), and a part or all of the application program stored in the EEPROM ₇ at this point is erased (step S ₆ ).
₈ ). The program A _{1 is} also erased (step S ₉ ). Determines whether the above processing has been completed (step S _10), if it is determined not completed, the process returns to step S _5.

[0016] Step S when determining the completion of processing in _10, the program A ₂ That application program I / O pin for the program from the external device writes P5 and the I / O
Via port 5 uptake (step S _11), RAM 4
Alternatively, it is written in a predetermined area of the EEPROM 7 (step S ₁₂ ). Next, by executing the program A ₂ (step S ₁₃ ), a new application program is fetched from the external device side via the I / O terminal P 5 and the I / O port 5 (step S ₁₄ ), and a predetermined area of the EEPROM 7 is read. write to (step S _15). Operations of steps S ₁₄ and S ₁₅ writes the application program are repeated until the end (step S _16).

[0017] Upon determining the writing ends in step S _16, to erase the program A ₂ (step S _17), the change application program ie the update is successful, confirmed by the method of checksum or verify the like ( step S _18), it executes the updated application program (step S _19). Incidentally, when the predetermined time has elapsed and the result of the collation in step S ₄ in step S _3, if it is determined not to match, changing process of step S ₅ to S ₁₈ is not performed, originally EEPROM7 storage The executed application program is executed (step S ₁₉ ).

In the above embodiment, the update operation for changing the application program from the old one to the new one is executed by the erasing by the program A ₁ and the writing by the program A _2. However, it may be executed by one program. You may

In addition, programs A ₁ and A _{2 can be} sent from an external device.
However, the programs A ₁ and A ₂ may be stored in the IC card 10 'in advance.

[0020]

As described above, according to the present invention, the memory device includes electrically rewritable memory means, and the memory means stores the application program for applying the IC card to a specific purpose. Therefore, there is an effect that an IC card capable of changing the application program can be obtained even at the use stage.

According to another aspect of the present invention, since the application program is fetched from the external device and stored in the electrically rewritable memory device, the application program can be changed even in the use stage. IC that can
There is an effect that the method of changing the application program of the card can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an IC card according to the present invention.

FIG. 2 is a flowchart showing an embodiment of a method for changing an application program of an IC card according to the present invention.

FIG. 3 is a block diagram showing a conventional IC card.

[Explanation of symbols]

1 CPU 2a ROM 3 EEPROM 4 RAM 5 I / O port 7 EEPROM S ₅ Loading application program erasing program S ₁₁ Loading application program writing program S ₁₄ Loading application program S ₁₅ Writing application program S ₁₅

Claims (3)

[Claims] 1. A CPU for controlling the entire IC card, a memory device for storing data and various programs, and data transmission / reception between the IC card and an external device.
In an IC card having an I / O port, the memory device includes electrically rewritable memory means, and an application program for applying the IC card to a specific purpose is stored in the memory means. IC card. 2. A method of changing an application program of an IC card for updating an application program for applying an IC card to a specific purpose, wherein the application program is fetched from an external device and stored in an electrically rewritable memory device. A method for changing an application program of an IC card, characterized by: 3. The method of changing an application program of an IC card according to claim 2, wherein a program for instructing an operation of updating and writing the application program is fetched from an external device.