JPS62269289A - Portable electronic unit - Google Patents

Abstract

PURPOSE:To eliminate the change of program as well without increasing interpretive programs by the increase of functional programs, and to freely set the program without changing interpretive programs as for corresponding functional codes by storing the addresses of program memories in a data memory. CONSTITUTION:A data memory is divided into plural areas and area number (00-FF) is given to each area. Out of the areas, leading address and number of bytes constituting the area are stored in an area [00] to correspond to the area number. For instance, the leading address of an area [02] is A02, the number of bytes constituting the area is S02 bytes. In an area [01], the leading address of each functional program is stored to correspond to the functional code. For instance, the leading address of a program that realizes a functional code [B] is [bbb].

Description

Detailed Description of the Invention Object of the Invention (Industrial Application Field) The present invention relates to an IC (integrated circuit) chip having a non-volatile data memory and a control element such as a CPU (central processing unit). The present invention relates to a portable electronic device with a built-in so-called 1.C card.

(Prior Art) Recently, as a new portable data storage medium, an IC card incorporating an IC chip having a nonvolatile data memory and a control element such as an 02 port has been developed. This IC card uses an internal III 1m element to read, write, or erase data from the built-in data memory.

Usually, the control element is controlled by a built-in control program. That is, when command data is input from an external device, a decoding program in a control program is executed, a program corresponding to the input command data is searched for and executed, and the result is then output to the outside.

Here, the function code added to the instruction data in the above decoding program is extracted, and using multi-stage branch instructions with the function code as a branch condition, each jumps to the program corresponding to the national ability code. Let's take the method. In this case, the number of branch instructions required is equal to the number of functions the IC card has, that is, the number of function programs in the control program. Furthermore, when changing the correspondence between function codes and function programs, the decoding program must be changed at any time, making it unsuitable for mass production.

(Problems to be Solved by the Invention) With the above method, the number of branch instructions increases in proportion to the number of functional programs.

Furthermore, since the branch condition is a function code, for example, to change the correspondence between functions and function codes, the branch condition in the control program must be changed.

Therefore, the present invention prevents the number of decoding programs from increasing due to the increase in the number of functional programs, and eliminates the need for changes.
Another object of the present invention is to provide a portable electronic device in which the corresponding function code can be arbitrarily set without changing the decoding program.

[Configuration of the Invention (Means for Solving the Problems)] The portable electronic device of the present invention stores, for example, a table of function codes and destination addresses to the corresponding function programs in a data memory. The decoding program is configured to search for the function code shown in the table, and if it is found, jump there using the corresponding address.

(Operation) As a result, the number of decoding programs does not increase due to an increase in the number of functional programs, and no changes are required. Further, the corresponding function code can also be set arbitrarily without changing the decoding program.

Therefore, since it is only necessary to create one decoding program, it is effective at a mass production level.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 11 shows an IC as a portable electronic device according to the present invention.
This figure shows an example of the configuration of a card handling device used as a terminal device in a home banking system, shopping system, etc., to which a card is applied.

That is, this device connects the IC card 1 to a card reader.
It is possible to connect to the IIL control unit 3 consisting of a CPU etc. via the writer 2, and the control unit 3 is equipped with a keyboard 4, C
It is configured by connecting an RT display device 5, a printer 6, and a floppy disk device 7.

The IC card 1 is held by the user and is used to refer to a personal identification number known only to the user when making a purchase, for example, and to store necessary data. Its functional blocks are shown in Figure 10. It is comprised of parts that execute basic functions such as a read/write section 11, a password setting/password verification section 12, and an encryption/decryption section 13, and a supervisor 14 that manages these basic functions. Lead
The write section 11 has a function of reading, writing, or erasing data from/to the card reader/writer 2. The password setting/password verification section 72 has a function of storing the password set by the user and prohibiting reading thereof, and after setting the password, verifying the password and granting permission for subsequent processing. Encryption/decryption section 13
, for example, performs encryption and decryption of encrypted data to prevent leakage and forgery of communication data when data is transmitted from the control unit 3 to another terminal device via a communication line. , for example DES (Data En
This is a function to process data according to an encryption algorithm with sufficient encryption strength, such as Cr"y'1)tion Standard). This is a function that decodes a function code, selects and executes a necessary function from among the basic functions.

In order to exhibit these various functions, the IC card 1 is equipped with a control element (for example, CPLI) as shown in FIG.
) 15, consists of a nonvolatile data memory 16 whose storage contents can be erased, a program memory 17, and a contact part 18 for obtaining electrical contact with the card reader/writer 2. parts (control element 15, data memory 16, program memory 17
) is made into an IC chip. The program memory 17 is composed of, for example, a mask ROM, and, as shown in FIG. 3, stores a control program for the control element 15 including function programs for realizing each of the basic functions. The data memory 16 is used to store various data and is composed of, for example, an EEPROM.

The data memory 16 is divided into a plurality of areas, as shown in FIG. 1, for example, and each area is assigned an area number [Oo to FF]. Among these, area [00] stores the start address of each of all areas and the number of bytes constituting the area in correspondence with the area number. For example, the start address of area [02] is address A02, and the number of bytes making up the area is 302 bytes.

Further, in area "01", as shown in FIG. 2, the start address of each of the function programs is stored in correspondence with the function code. For example, the start address of a program that implements function code "B" corresponds to rbbbJ.

The card reader/writer 2 is used to exchange function codes and data between the IC card 1 and the control section 3.

Specifically, as shown in FIG.

A transport camera mechanism 31 that transports the IC card 1 inserted into a card insertion slot (not shown) to a predetermined position, a contact part 32 that electrically contacts the contact part 18 of the IC card 1 set in a predetermined position, the whole A control circuit 33 consisting of a CPU or the like that controls the control circuit 33, an input/output interface circuit 34 for exchanging command data and response data between the control circuit 33 and the control unit 3, a data memory 35 for storing data, etc. It consists of

Next, the operation in such a configuration will be explained.

First, the card reader/writer 2 operates according to the flowchart shown in FIG. That is, in the steady state, it is in a state of waiting for command data from the control section 3. When command data is input from the control unit 3, the control circuit 3
3 confirms whether or not the IC card 1 is in execution, and if it is in execution, outputs response data indicating a multiple instruction data error to the control unit 3, and returns to the instruction data waiting state again. If IC card 1 is not running,! II
111 circuit 33 outputs command data to IC card 1,
It enters a state of waiting for response data from the IC card 1.

When there is response data from the IC card 1, it outputs the response data to the control section 3 and returns to the command data waiting state.

The command data output from the card reader/writer 2 to the IC card 1 has a format as shown in FIG. 5, for example, and may be in the form of only a function code as shown in FIG. As shown in b), there is a form in which data is added to the function code.

The IC card 1 operates according to the flowchart shown in FIG. That is, in the steady state, it is in a state of waiting for command data from the card reader/writer 2.

When command data is input from the card reader/writer 2, the control element 15 executes basic functions according to the command data, outputs response data to the card reader/writer 2, and returns to the command data holding state again. In this case, the response data is appended with the performance code in the input command data, and protective measures are taken in case the sequence with the card reader/writer 2 is disrupted.

Next, a specific example of the operation of the IC card 1 will be explained with reference to the flowchart shown in FIG.

When the command data is input, the control element 15 uses the decoding program in the υ control program in the program memory 17 to extract the function code added to the command data. Thereafter, the control element 15 searches for the extracted function code in area "01" of the data memory 16. If it is not found, the control element 15 outputs response data indicating a function code error and returns to the command data holding state again. If found, the control element 15 extracts the start address of the corresponding functional program and jumps to the functional program. And after running that functional program,
Output the result as response data and return to the command data holding state again.

For example, in Figure 2 <8), the function code is "
For instruction data to which the code "C" is added, a function program starting from address 1-cccJ is executed. Also, for example, this address “c
If the function program starting with ccJ is a data write function program, the additional code "C" is associated with the data write function code.

Similarly, in the correspondence table shown in FIG. 2(b), if the function program starting with the address "CCC" is a data write function program, the function code rDJ becomes the data write function code.

That is, when changing or adding a functional program, it is not necessary to change the decoding program, and it is only necessary to change or add the correspondence table shown in FIG. 2.

Furthermore, the correspondence between function programs and function codes can be changed by simply changing the above correspondence table.

In the above embodiment, an IC card is used as an example of a portable electronic device, but the present invention is not limited to a card-shaped device, and may be a block-shaped or pencil-shaped device, for example. Furthermore, the hardware configuration of the portable electronic device can be modified in various ways without departing from the spirit of the invention.

[Effects of the Invention] As detailed above, according to the present invention, the number of decoding programs does not increase due to an increase in the number of functional programs, and there is no need to change the number of decoding programs. A portable electronic device that can be arbitrarily configured can be provided.

[Brief explanation of the drawing]

The figures are for explaining one embodiment of the present invention, and FIG. 1 is a diagram showing the structure of the data memory, FIG. 2 is a diagram showing the correspondence between the function code and the start address of the malicious program, and FIG.
The figure shows the configuration of the program memory, FIG. 4 is a flowchart explaining the operation of the card reader/writer, and FIG.
The figure shows an example of the format of command data output from the card reader/writer to the IC card, Figures 6 and 7 are flowcharts explaining the operation of the IC card, and Figure 8 shows the configuration of the card reader/writer. Block diagram shown,
FIG. 9 is a block diagram showing the configuration of an IC chip built into the IC card, FIG. 10 is a diagram showing the functional blocks of the IC card, and FIG. 11 is a block diagram showing the configuration of the card handling device. 1...IC card (portable electronic device), 2.
...Card reader/writer, 15...Control element (CPU), 16...Data memory, 1
7...Program memory. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 3 Function code ρ (Q) (b) Figure 2 Figure 4 Figure 5 Figure 6 Figure 7 r ”1L
JFigure 9

Claims (6)

[Claims] (1) It has a data memory, a control element for reading and writing data to the data memory, and a program memory for storing a control program for the control element to perform control, and selects What is claimed is: 1. A portable electronic device that performs external input/output, wherein an address of the program memory is stored in the data memory. (2) The mobile phone according to claim 1, wherein the address of the program memory is a jump address to a program associated with external command data, and the program is executed from this address. Possible electronic devices. 3. A portable electronic device according to claim 1, wherein the program memory resides within the control element. (4) The portable electronic device according to claim 1, wherein the program memory is located outside the control element. (5) The portable electronic device system according to claim 1, wherein the data memory is an erasable non-volatile memory. (6) The portable electronic device system according to claim 1, wherein the control element is a CPU (Central Processing Unit).