JPS63239582A - Portable electronic device - Google Patents

Abstract

PURPOSE:To facilitate programming and to increase a processing speed by setting a program memory to an address to be accessed next automatically after the end of access. CONSTITUTION:An IC card 1 consists of a control element 11, a data memory 12, and a program memory 13. The element 11 performs access operation when supplied with an access instruction for the memory 12. Then the address to be accessed next is set in the memory 13 automatically. Consequently, an instruction for updating the contents of the memory 13 need not be sent out every time an access instruction is sent to facilitate programming and also improve the processing speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a portable electronic device called an ffIc card, which has a built-in integrated circuit consisting of, for example, a memory and a control circuit.

(Prior Art) As is well known, when writing information to a storage device, the contents of a pointer as instruction information indicating the address of the storage device to be layered are changed by the operation shown in FIG. A required destination address is set, and in this state, information is written as shown in FIG. Furthermore, when writing the next information, the write operation is similarly executed with the contents of the pointer set to the next destination address.

In this way, conventionally, when performing an access operation such as self-inclusion, first the instruction of the pointer 1111211 is
The control section is supplied with a write command to set the contents of the pointer to the target address, and then a write command is supplied to the control section to perform an information write operation. Therefore, when writing information, it is necessary to supply a pointer control command to the control unit each time, and if there is a lot of information to be written, creating a program becomes complicated and the processing time increases. there were.

(Problems to be Solved by the Invention) This invention solves the problems of program complexity and processing time delays caused by having to execute an instruction to control a pointer every time an access instruction is executed. The purpose is to provide a portable electronic device that is easy to program and can increase processing speed.

[Structure of the Invention] (Means for Solving Problem 8) This invention provides a storage means for storing arbitrary information, an instruction means for instructing an address of the storage means, and an access command for the storage means. In response, the address specified by the instruction means is accessed, and after the access is completed, the control means automatically sets the instruction means to the next address to be accessed.

(Operation) This invention performs an access operation when an access command to the storage means is supplied, and then automatically sets the next address to be accessed in the instruction means, so that each time an access command is issued, This eliminates the need to issue a command to update the contents of the instruction means.

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

FIG. 3 shows a card handling device to which an IC card as a portable electronic device is applied, and this card handling device is used as a terminal device in, for example, a financial system or a shopping system. This device includes a card reader/writer 2 into which an IC card 1 is attached, a control unit 3 that exchanges information with the IC card 1 via the card reader/writer 2, a keyboard 4 connected to the control unit 3, and a CRT. It consists of a display device 5, a printer 6, and a floppy disk device @7.

FIG. 4 shows the structure of the IC card 1. As shown in FIG. This IC card 1 includes a control element 11 as a control unit (CPU), a nonvolatile data memory 12 in which necessary data is stored and whose storage contents can be erased, a program memory 13 in which programs are stored, and the card reader. - Consists of a contact portion 14 for making electrical contact with the lighter 2. Of these, the sub-element 11, data memory 12, and program memory 13 within the broken line are constituted by one C chip, and are embedded in the IC card 1.

Next, the gist of the invention will be explained.

FIG. 2 shows an example of a write operation of block data (a series of continuous data) performed by the control element 11 of the IC card 1. As shown in FIG.

In the same figure, step STI is a write routine (command), and this write routine has parameters as
The number of data to be written is set, and the data write operation is performed according to this number of data. When this operation is completed, it is determined in step ST2 whether the write operation was performed normally or not, and if the write operation is abnormally completed, the block data write operation is ended. In addition, in the case of normal termination, it is determined in step ST3 whether or not writing of all data has been completed, and if not completed, step ST4
At , a pointer control routine (instruction) is operated. This pointer control routine is shown in FIG. 5 mentioned above, and when this operation is completed, step ST5 is executed.
At this point, it is determined whether or not the pointer control routine has operated normally. As a result, in the case of abnormal termination, the process is terminated, and in the case of normal termination, the operation of step ST1 is executed. and,
The write process ends when all data has been written.

FIG. 1 shows the write routine of step STI. In this write routine, step 5T1
1, a write operation for one data is performed, and when this write operation is completed, it is determined in step 5T12 whether or not the write operation has ended normally. As a result,
If it has ended abnormally, υ111 performs the step ST
2 and if it has ended normally, proceed to step 5T.
At step 13, it is determined whether writing of all data of the set number of data has been completed. As a result, if there is any remaining data, a pointer control operation is performed in step 5T14, and the pointer is incremented. Thereafter, in step 5T15, it is determined whether or not the pointer control operation has ended normally. If it has ended normally, the above-described write operation is performed again in step 5T11. Then, when all data has been written, #111 is sent from step STI 3 to Stella 1S-2.
II will be migrated.

According to the embodiment described above, a 1-in operation and a pointer control operation are provided in the write routine. Therefore, when executing a write routine, the pointer is automatically incremented when the write operation is completed and there is still write data left, so it is necessary to use a pointer control routine every time the write routine is used. It is possible to easily create a program without having to do so.

Furthermore, since it is not necessary to use a pointer control routine every time a write routine is used, it is extremely advantageous when reading continuous data such as block data.

In the above embodiment, the present invention is applied to a write instruction, but the present invention is not limited to this, and for example, when the pointer 1 is applied to a data read instruction or an erase instruction.
By incorporating the [IIll] operation, it is possible to obtain the same effects as in the above embodiment.

Of course, various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As described in detail above, according to the present invention, when an access command to the storage means is supplied, an access operation is performed, and then the next address to be accessed is automatically sent to the instruction means. By setting this, it is no longer necessary to issue a command to update the contents of the instruction means every time an access command is issued.
It is possible to provide a portable electronic device that can facilitate program creation and improve processing speed.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show an embodiment of the present invention, and are shown for explaining the data write operation, respectively.
FIG. 3 is a block diagram showing an example of a card handling device, FIG. 4 is a block diagram showing an example of an IC card, and FIGS. 5 and 6 are diagrams each shown to explain a conventional write operation. 1...IC card, 11...control element, 12...
data memory. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 5

Claims (4)

[Claims] (1) A storage means in which arbitrary information is stored, an instruction means for instructing an address of the storage means, and an address specified by the instruction means is accessed in response to an access command to the storage means, and the address specified by the instruction means is accessed. and control means for automatically setting the instruction means to an address to be accessed next after completion of the instruction. (2) The portable electronic device according to claim 1, wherein the access command comprises a data write command. (3) The portable electronic device according to claim 1, wherein the access command comprises a data read command. (4) The portable electronic device according to claim 1, wherein the access command comprises a data deletion command.