JPS61241888A - Portable medium - Google Patents

Abstract

PURPOSE:To erase undesired data and to avoid erasion of those data to be preserved permanently by storing data in the 1st erasion-enable memory means or the 2nd erasion-unable memory means in response to the specific data added to the memory data supplied from outside. CONSTITUTION:An address storing data to be erased and the specific conditions for erasion are supplied to a CPU 3 from a CPU 11 of an IC card handling machine 10. The CPU 3 decides whether the data can be preserved permanently or not by a fact whether a flag is set up or not in an area (e) included in the property information (b) added to the data stored in the address supplied. If it is decided that the data cannot be preserved permanently, the CPU 3 decides whether the coincidence is obtained between the specific conditions for erasion supplied and the specific conditions for erasion of an area (f) in the information (b) added to the memory data. When the coincidence is obtained, the memory data is erased. While the property discordance signal is supplied to the CPU 11 in case data can be preserved permanently. Thus it is possible to erase the undesired data and avoid erasion of the data to be preserved permanently.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention is applicable to ICs such as CPUs and data memories.
The present invention relates to a portable medium such as an IC card with a built-in chip.

[Technical Background of the Invention II] Recently, an IC card has been developed as a memory card that can store data and has been put into practical use. This IC card includes a central processing unit (CPU), a mask ROM that stores control programs, and an EFROM.
Or data memory such as EEPROM.
It has a built-in C chip. The CPU is connected to a terminal on the surface of the card, and data is input and output from the outside through this terminal, and data is written to and read from the data memory under the control of the CPU.

[Problems with the Background Art] However, the tC card as described above includes an EPROM as a memory.

For this reason, data once stored cannot be erased from the outside. In this case, the disadvantage is that data that is no longer needed cannot be deleted.

Therefore, at present, an EEPROM is built in as a memory, and the stored data can be electrically erased. However, if you try to store data that you want to keep forever, there is a risk that this data will also be erased.

[Purpose of the Invention] This invention was made in view of the above circumstances, and its purpose is to provide a portable medium that can erase data that is no longer needed, and that can prevent data that you want to keep forever from being erased. It is about providing.

(Summary of the Invention) In order to achieve the above object, the present invention has a control element, in which storage data supplied from the outside is controlled by an identification code added to the storage data indicating whether the storage data is erasable or non-erasable. Depending on the data, the data is stored in the erasable first storage means or the non-erasable second storage means.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In Figure 11!2, 1 is an IC card as a portable medium. The surface of this IC card 1 has a connection section 2.
are provided, for example, a plurality of terminals 2a,...2
It is composed of h. The terminal 2a is for the operating power supply voltage (+5V), the terminal 2b is for grounding, the terminal 2C is for the clock signal, the terminal 2d is for the reset signal, and the terminals 28-
Terminal 2g is for data input/output, and terminal 2h is for Will voltage (+21V) for writing.

Also, inside the IC card 1, as shown in FIG.
It is composed of a data memory 4 in which data is stored, an interface circuit 5, and a mask ROM 6 in which various control programs are recorded. Each of the above parts is composed of an IC chip and is provided on one M board. Further, the interface circuit 5 and the connection section 2 are wired.

The data memory 4 includes an erasable EEPROM (first storage means>4a) for temporarily retaining data and a non-erasable EEPROM for permanently retaining data.
OM (consisting of second storage means>4b).

The above CPtJ3 responds to input data supplied from the outside, that is, stored data, and specific data added to this stored data.

Store the stored data in EEPROM4a1 or EFRO.
This is to be stored in M4b. The above input data is the third
As shown in the figure, it is composed of n-by-1- storage data a, and specific data consisting of 1-byte property information indicating the nature of the data and 2-byte address information C indicating the storage area. As shown in Figure 4, the above property information is an area d where a flag indicating whether 1 bit is to be permanently held (erasable) or temporarily held (cannot be erased) is stored.
, area e (temporary storage Nogawa) where a flag indicating the possibility of permanent retention of 1 bit is stored, area f where specific conditions for changing 3 bits are stored, and specific conditions for erasing 3 bits are stored. It is made up of a storage area q.

In addition, as shown in Figure 5, the recorded data (n bytes) stored in the EEPROM 4a or EPROM 4b has information indicating the nature of the data, that is, whether it can be changed to permanent storage (whether permanent storage is possible). Information is added and stored.

6 and 7 show the configuration of an IC card handling machine 10 as a terminal according to the present invention. That is, 11 is a CPU (central processing unit) that controls the whole, 12 is a keyboard for inputting data, 13 is a CRT display device, and 14 is a ROM (read-only) in which the v control program is stored.
15 is a RAM (random access memory) in which data is stored; 16 is a dot printer that outputs various print data; 17 is a floppy disk 19 inserted from a floppy disk insertion slot 18 for storing data; Fronby disk device for playback, 2
Reference numeral 0 denotes an IC card reading/input predicate that reads data in the memory of the IC card 1 inserted from the card insertion slot 21 or writes data into the memory.

The IC card reader/predicate section 20 is connected to the main body of the card handling machine 10 by a cable 22. That is, as shown in FIG. 8, a transport bus 31 for transporting the IC card 1 inserted through the card insertion slot 21 is provided. On the transport bus 31, a plurality of rotatable transport rollers 32 are arranged in pairs, which are positioned so as to sandwich the IC card 1 from above and below when it is transported. The pair of transport rollers 32 are provided along the transport bus 31 at equal intervals.

The distance from the center of each of these transport rollers 32 to the center of the adjacent transport roller 32 has the width dimension in the card transport direction. Therefore, the transport bus 31 for the IC card 1 is defined by the transport guide 33.

Further, the CP in the IC card 1 is placed on the transport guide 33.
A reader/writer 34 that exchanges data with U3 is raised. This reading/writing device 34 is electrically connected to the connecting section 2.

Next, handling of an IC card in such a configuration will be explained. First, data storage will be explained with reference to the flowchart shown in FIG. For example, input data as shown in FIG. 3 is supplied from the CPU 11 of the IC card handler 1110 to the CPIJ 3 (STI
). Then, the CPU 3 determines whether the input data is for permanent retention or temporary retention, depending on whether or not a flag is set in area d in the property information of the input data. Furthermore, the data memory stored based on this determination result and the address information C in the input data is EEPROM4ahlEPROM.
4b, it is determined whether the nature of the data matches the memory in which it is stored (Sr1). If the results of this determination match, the data consisting of the memory data a and the property information t/F1b (see FIG. 5) among the input data is transferred to the EEPROM 4a or EP indicated by the address information C.
It is stored in the ROM4b area (Sr3.4.5). In addition, if the discrimination result in step 2 above does not match,
A property mismatch signal is supplied to the CPU 11 (Sr6).

Next, permanent retention and storage of temporary retention data stored in advance in the erasable EEPROM 4a will be explained with reference to the flowchart shown in FIG. That is, the address where data temporarily held from the CPU 11 of the IC card handling machine 10 is stored;
The address to be permanently held and specific conditions for property change are supplied to the CPU 3 (ST11). Then, CPU3
determines whether or not permanent storage is possible (S
T12). As a result of this determination, if it is determined that permanent storage is possible, the CPU 3 determines that the supplied specific conditions for changing the properties match the specific conditions for changing the area f in the property information added to the storage data at the above address. It is determined whether or not to do so (ST13). If the result of this determination is a match, is it possible to store the above stored data in the non-erasable EPROM 4b according to the address to be permanently stored, and change it to permanent storage in area e in the property information for the original data? The flag indicating this is deleted to make it unchangeable (ST14). In addition, if the result of the above step 12 cannot be retained permanently, a property mismatch signal is supplied to CPLJll <5T
15).

Furthermore, if the determination result in step 13 above does not match, a specific condition mismatch signal is supplied to the CPU 11 (ST16).
.

Next, the contents of the pre-erasable EPROM 4b will be explained with reference to the flowchart shown in FIG. In other words, CPU1 of IC card handling 8110
1, the address where the data to be erased is stored and specific conditions for erasing are supplied to the CPU 3 (ST21>).

Then, CPtJ3 determines whether permanent storage is possible or not, based on whether or not a flag is set in area e in the property information added to the stored data at the supplied address (ST22). As a result of this determination, if it is determined that permanent retention is not possible, CPtJ3 will check whether the supplied specific conditions for erasing match the specific conditions for erasing in the area within the property information added to the storage data to be erased. It is determined whether or not to do so (ST23). If the result of this determination is a match,
The above stored data is erased (ST24). Further, if the determination result in step 22 can be permanently retained, a property mismatch signal is supplied to the CPU 11 (ST25). Further, if the determination result in step 23 is a mismatch, a specific condition mismatch signal is supplied to the CPU 11 (ST26).

As described above, data that is desired to be retained permanently is reliably stored in the non-erasable EPROM, and data that is desired to be temporarily retained is reliably stored in the erasable EEPROM. Further, among data for temporary storage, data that has the possibility of permanent storage is normally non-erasable even if it is stored in an erasable EEFROM. However, as described above, if the data is re-stored in the non-erasable EPROM due to an external request, the data stored in the erasable EEPROM does not require permanent retention.

Additionally, if permanent retention is no longer necessary among temporary retention data that has the possibility of permanent retention, the information bit indicating whether it can be changed to permanent retention in the property information of that data must be changed. Good. At this time, the non-erasable EPRO
It is also possible to give M a property that does not require permanent storage without re-memorizing it. This change can be made only when the data is to be deleted and only when specific conditions for deletion included in the data are met.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide a portable medium that can erase data that is no longer needed and can prevent data that is desired to be retained forever from being erased.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of the present invention, and FIG. 1 is a block diagram schematically showing the configuration of an electric circuit of an IC card, FIG. 2 is an external perspective view of the IC card, and FIG. A diagram for explaining the structure of input data, FIG. 4 is a diagram showing the structure of property information, FIG. 5 is a diagram showing the structure of stored data, and FIG. 6 is an external perspective view of the card handling machine. , Fig. 7 is a schematic block diagram of the card handling machine, and Fig. 8 is a block diagram of the card handling machine.
A sectional view showing the configuration of the C card reading/writing section, and FIGS. 9 to 11 are flowcharts for explaining the operation. DESCRIPTION OF SYMBOLS 1...IC card (portable medium), 2...Connection part, 2a-2h...Terminal, 3...CPU (control element), 4...Data memory, 4a...EEPR
OM. 4b...EPROM, 5...Interface circuit, 6...Mask ROM, 10...G card handling machine,
11... CPtJ, 13... CRT display device, 20... IC card reading/writing section, 34... reading/writing device. Applicant Agent Patent Attorney Takehiko SuzueFigure 1Figure 7Figure 8Figure 3ms9Figure 10

Claims (6)

[Claims] (1) In a portable medium having a control element, an erasable first storage means, a non-erasable second storage means, and a specification added to storage data supplied from the outside. A means for determining whether the data is permanent storage or temporary storage according to the data, and a means for selectively storing the stored data in the first storage means or the second storage means according to the determination result of this means. A portable medium characterized by: (2) Claim 1, characterized in that the specific data is data indicating whether erasure is possible or non-erasable.
PORTABLE MEDIA AS DESCRIBED IN SECTION. (3) The portable medium according to claim 1, wherein the control element is a CPU. (4) The first storage means is an erasable EEPROM.
2. The portable medium according to claim 1, wherein the second storage means is comprised of a non-erasable EPROM. (5) In a portable medium having a control element, an erasable first storage means, a non-erasable second storage means, and a specification added to stored data to be changed in response to an external storage change instruction. means for determining whether or not the data stored in the first storage means can be re-stored in the second storage means according to the data;
and means for re-storing the data stored in the storage means in the second storage means. (6) The specific data is data indicating whether or not the data stored in the first storage means can be re-stored in the second storage means. Portable medium.