JPS62287388A - Ic card - Google Patents

Abstract

PURPOSE:To prevent a lost IC card from being used illegally when a person other than the regular owner obtains the card by erasing specific data stored in a memory when a timer counts up to its initial value. CONSTITUTION:A battery mechanism 13 supplies power to a microprocessor 11 and the memory 12 through a power supply line 17 when the microprocessor 11 is not supplied with power from outside after transmitting data forward and backward between the memory 12 and the outside through a data bus 15 and an address bus 16, so that the IC card 10 operates by itself. A timer mechanism 14 when there is access sets the timer value to the initial value and monitors the timer value, thereby erasing the specific data in the memory when the timer value reaches the certain time.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Industrial application field] The present invention relates to an IC card.

[Conventional technology]

Conventionally, this type of IC card has a structure in which specific data remains semi-permanently.

[Interlayer point to be invented or solved]

The above-mentioned conventional IC cards have the disadvantage that specific data remains semi-permanently, so that they can be misused by anyone other than the authorized owner.

A processor and electrically rewritable memory.

An IC card in which a first contact for supplying a power supply voltage, a second contact for supplying voltage, and a third contact for exchanging data signals are enclosed in a plastic substrate, and the microprocessor and the above-mentioned A battery mechanism that enables both or any of the source memories to supply power to one of them, and a battery mechanism that monitors an initially set timer value and stores this timer value in the memory after a certain period of time has elapsed. [Embodiments] Nine embodiments of the present invention will be described below with reference to the drawings.

Referring to FIG. 1, the configuration of an embodiment of an IC card according to the present invention is shown in a block diagram. In FIG. 1, an IC card 10 has a microprocessor 1, an electrically rewritable memory 2, and a data bus 1.
5 and an address bus 16. or,
The microprocessor-1 has 18 sets of I/Q line contacts and 19 contacts. Clock supply contact 20. and externally connected through the power supply contact 21.

Furthermore, the IC card 10 of this embodiment includes a battery mechanism 13 and a timer mechanism 14. The battery mechanism 13 is.

After the microprocessor 11 exchanges data with the memory 2 through the data bus 15 and the address bus xt, when power is no longer supplied from the outside, the microprocessor 1
It supplies power to the memory 2 and enables active operation of the rc card IO by itself.

Referring to FIG. 2, a flowchart illustrating the operation of the timer mechanism 14 of FIG. 1 is shown.

When the timer mechanism 14 is accessed (ygs in step 100), it sets the timer value to the initial value (step 101), monitors the timer value (step 102), and sets the timer value to the initial value after a certain period of time has elapsed (step f103). YES
), the specific data stored in the memory 12 is erased (step 104).

゛ [Effects of the invention] As is clear from the above description, there are two aspects of the present invention.

As the initial timer value counts up, specific data stored in the memory is erased, so there is no need to worry about it being misused even if the IC card is lost and handed over to someone other than its authorized owner. effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of an IC card according to the present invention, and FIG. 2 is a flowchart for explaining the operation of the timer mechanism shown in FIG. DESCRIPTION OF SYMBOLS 10... IC card, 11... Microprocessor 12... Memory, 13... Battery mechanism, 14... Timer mechanism, 15... Delta path, 16... Address bus. 17... Power supply line, 18... I10 line contact 19... Reset contact, 20... Clock supply contact, 21... Power supply contact.

Claims (1)

[Claims] 1. At least a microprocessor, an electrically rewritable memory, a first contact for supplying a power supply voltage, a second contact for supplying a clock, and a third contact for exchanging data signals are arranged in a plastic substrate. I enclosed in
The C card includes a battery mechanism for supplying power to both or one of the microprocessor and the memory, and a battery mechanism that monitors an initially set timer value and returns the memory to the memory after a predetermined period of time has elapsed. An IC card characterized by comprising a timer mechanism for erasing specific data stored in the IC card.