JP2001209766A - Memory initialization system for ic card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that processing time for initialization is taken so much since data for initializing an EEPROM is prepared on a RAM in the conventional method. SOLUTION: In this system a nonvolatile memory can easily be initialized by preliminarily preparing an initialization data pattern 41 on a ROM 4 and initializing a specific data space existing the EERPOM 5 with the data pattern in the nonvolatile memory of an IC card.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an EEPROM (Ethernet).
Electrically Erasable and
Programmable Read Only Mem
(ory), and particularly to a memory initialization method for the IC card.

[0002]

2. Description of the Related Art Initialization processing of an EEPROM, which is a rewritable nonvolatile memory in an IC card, is performed many times within the maximum number of rewritable times during the life cycle of the IC card. there is a possibility. Therefore, a RAM, a ROM, and an EEPROM required for performing the initialization processing including shortening the time of the initialization processing itself.
It is desirable that the usage of each resource such as M is also low.

[0003]

However, the prior art has the following problems.

[0004] The first problem is that it takes a long processing time for initialization. The reason is that in the conventional method, data for initializing the EEPROM is stored in the RAM.
This was because it had to be created above. This means that processing instructions and processing time are increased by the amount of processing required to create data for initialization on the RAM.

[0005] The second problem is that the memory usage increases. The reason is that in connection with the first problem, the contents of the initialization data are stored in the RAM at the time of the initialization processing, and the contents are transferred to the EEPROM for initialization, so that the RAM is used. This is because there are times.

The present invention provides an initialization method that solves the above problems.

[0007]

An IC according to the first invention of the present application
The memory initialization method of the card is such that, in an IC card and an external processing device connected to the IC card, the IC card includes a CPU, a ROM for storing an OS, an application program, and the like, and the ROM for initializing a memory. RO
M, an initialization data pattern including a set of continuous data set on M, an EEPROM, an initialization target memory on the EEPROM, which is initialized by the initialization data pattern, the CPU, and the EEPROM.
A write buffer installed between the external processing device and a RAM, and an input / output port for transmitting and receiving data to and from the external processing device.

In a memory initialization method of an IC card according to a second aspect of the present invention, in the initialization processing of the EEPROM memory of the IC card, a data pattern to be initialized is stored in advance in the ROM of the IC card, When the instruction for initialization is issued, the data pattern is read from the ROM in a specified range of the EEPROM memory, and is initialized by writing the data pattern into the EEPROM.

In the memory initialization method for an IC card according to the third invention of the present application, in the initialization processing of the EEPROM memory of the IC card, a data pattern for initializing a record is stored in advance in the ROM of the IC card. When an initialization instruction is issued, a data pattern to be initialized of the record is read from the ROM in a specified range of the memory of the EEPROM, and the initialization is performed by writing the data pattern to the EEPROM. .

A memory initialization method for an IC card according to a fourth invention of the present application is the third invention, wherein the record is intended for various records such as a record applied to transaction statement information of a bankbook. Prepare.

A memory initialization method for an IC card according to a fifth aspect of the present invention is the same as the third aspect,
The method further comprises having a data pattern to be initialized for one or more of the records.

[0012] A memory initialization method for an IC card according to a sixth invention of the present application is the third invention, wherein the record has management information including a field indicating the total length of the record in the record.

In a memory initialization method for an IC card according to a seventh aspect of the present invention, in the third aspect, as the initial data pattern of the record, character items in the record are blank data, and numeric items are decimal numbers. Comprising having zero.

[0014]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, I to which the present invention is applied
The C card 1 includes a CPU 2, a RAM 3, which is a volatile memory for temporarily setting / referencing data as a work area during operation, a ROM 4, a nonvolatile memory for storing an OS, an application program, and the like, and a ROM 4. An initialization data pattern 41 for initializing an EEPROM which is stored and prepared in advance as a set of data paying attention to data continuity, and an EEPROM 5 of an erasable nonvolatile memory for storing data generated by an application program or the like. An initialization target memory 51 on the EEPROM 5 which is to be initialized by the initialization data pattern 41; an input / output port 6 for inputting / outputting data to / from an external processing terminal; And a bus 7 comprising an address bus and a data bus for connecting
A write buffer 8 located between the M4 and the EEPROM 5 is a constituent element.
There is an external processing device 9 such as a terminal.

Referring to FIG. 2, the initialization method according to the present invention uses the initialization data A having a length of, for example, 64 bytes resident in the read area on the ROM 4 memory of the IC card 1 and the initialization data on the ROM 4 of the IC card 1. And an initialization program B for performing processing. The content of the data A is, for example, 64
All bytes are null (00 in hexadecimal) or 16
It may be FF in radix, and it is not particularly determined.

The initialization data A is placed in a read area on the ROM 4 of the IC card 1 as an initialization data pattern 41, read by the initialization program B, and passed through the write buffer 8 to the EEPROM of the nonvolatile memory.
Written in 5. The size of one write to the EEPROM 5 is 64 bytes of the size of the data A. The write buffer 8 is also the same 64 bytes. As shown in FIG. 2, data A is repeatedly set over the entire range of the EEPROM 5 to be initialized, and initialization is performed.

Next, the operation of the embodiment of the present invention will be described with reference to the flowcharts of FIGS.

The initialization of the EEPROM 5 is performed by the EEPROM
In order to indicate the area range of the initialization target memory 51 to be initialized on the OM 5, a start address and an end address are designated from the external processing device 9, and the input / output port 6 having received the address notifies the CPU 2.

In step A1, a start address is input to a work current address to set an initial state. Step A2
Now, the current address and the data A to be initialized at once
Is added to a register or the like, and the end address is compared with the sum. If the added value is equal to or less than the end address, the process proceeds to step A3, and if the size is over, the process proceeds to step A6. At step A3, the data A in the read area of the ROM 4 is written to the write buffer 8, and at step A4, the contents of the write buffer 8 are written to the EEPROM 5. In step A5, the size of data A is added to the current address and updated. If the size is over in step A2, the process goes to step A6 to determine whether the current address is the same as the end address. If the current address is the same, the process ends. If they are not the same, the process proceeds to step A7, where the initial data C from the current address to the end address is created from the data A, written in the write buffer 8 in step A8, and the contents of the write buffer 8 are written in the nonvolatile memory in step A9. . With the above operation, the EEPROM 5 is used as the start address and the end address.
Are initialized with data A.

Next, another embodiment of the present invention will be described in detail with reference to FIGS.

The present embodiment is applied to a case where the IC card 1 is used as a bank passbook or a case where a recording range on the IC card 1 is initialized. As an example of the bank statement information, there is a record format as shown in FIG. In this example, the transaction date, transaction start time, transaction end time, transaction type (deposit, payment, transfer, etc.), transaction amount, balance after transaction,
It is composed of the store number where the transaction was performed and the ATM identification number used.

Assuming that decimal number 0 is set in a numeric item and blank data is set in a character item as initial data, in the example of FIG. 5, blank data is set in a transaction type item and 0 in other items. Are set in advance and are arranged in the ROM 4 in advance.

Although one example of the record contents has been described, various types of initialization records may be arranged on the ROM 4.

As for the instruction for initialization, a range for initialization is specified by a start address and an end address, as in the description of the above embodiment. When a plurality of records are stored in the ROM 4, a record type to be initialized is also specified.
As described above, the initialization process is performed as illustrated in FIG.

The total length of the designated record is, for example, 100
In the case of bytes, the size of the write buffer 8 is 64
Since it is a byte, initialization is performed in 64 byte units. That is, first, 64 bytes are written from the head of the record. Then, the remaining 36 bytes of the 100 bytes are combined with the data of the first 28 bytes of the record to obtain 64 bytes.
The second write is performed as bytes. As shown in FIG. 5B, a management information area may be provided as header information at the beginning of a record, and a record length item indicating the total length of the record may be provided therein.

[0027]

The first effect is that the initialization processing time can be shortened. Since it is desirable for the IC card to finish the processing within the response time, it is effective when the initialization processing is performed frequently.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a system configuration according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing operation contents of one embodiment of the present invention.

FIG. 3 is a flowchart illustrating an embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an operation content of another embodiment of the present invention.

FIG. 5 is an explanatory diagram showing the contents of a record example according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 IC card 2 CPU 3 RAM 4 ROM 41 Initialization data pattern 5 EEPROM 51 Initialization target memory 6 I / O port 7 Bus 8 Write buffer 9 External processing device

Claims (7)

[Claims] 1. An IC card and an external processing device connected to the IC card, wherein the IC card includes a CPU,
ROM for storing OS, application programs, etc.
An initialization data pattern composed of a set of continuous data set on the ROM for initializing a memory, an EEPROM, and an initialization target on the EEPROM which is initialized by the initialization data pattern. A memory for an IC card, comprising: a memory, a write buffer provided between the CPU and the EEPROM, a RAM, and an input / output port for transmitting and receiving data to and from the external processing device. Initialization method. 2. In an initialization process of an EEPROM memory of an IC card, a data pattern to be initialized is stored in the IC card.
The data pattern is stored in the ROM of the card in advance, and when an initialization instruction is issued, the data pattern is read from the ROM in a specified range of the EEPROM memory, and the data pattern is written into the EEPROM to initialize the data pattern. A memory initialization method for an IC card. 3. In an initialization process of an EEPROM memory of an IC card, a data pattern for initializing a record is stored in advance in a ROM of the IC card, and when an initialization instruction is issued, a designated EEPROM is designated. A memory initialization method for an IC card, wherein a data pattern to be initialized for a record is read from a ROM for the range of the memory described above, and the data pattern is written to the EEPROM for initialization. 4. The IC card memory initialization method according to claim 3, wherein said records are intended for various records such as records applied to bank statement information. 5. The memory initialization method for an IC card according to claim 3, wherein the ROM of the IC card has a data pattern for initializing one or a plurality of the records. 6. The IC card memory initialization method according to claim 3, wherein the record has management information including a field indicating the total length of the record in the record. 7. The memory initialization method for an IC card according to claim 3, wherein, as an initial data pattern of the record, character items in the record have blank data, and numeric items have decimal 0. .