JPS6437685A - Processor for potable medium - Google Patents
Processor for potable mediumInfo
- Publication number
- JPS6437685A JPS6437685A JP62193640A JP19364087A JPS6437685A JP S6437685 A JPS6437685 A JP S6437685A JP 62193640 A JP62193640 A JP 62193640A JP 19364087 A JP19364087 A JP 19364087A JP S6437685 A JPS6437685 A JP S6437685A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- card
- voltage
- reset signal
- release
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
PURPOSE:To surely protect information stored in a card from the reduction of a power supply for an IC card by monitoring the power supply of the card, and when the abnormality of the power supply is detected, inhibiting the release of a card reset signal. CONSTITUTION:It is supposed that the voltage of the card power supply 21 is dropped due to the short or the like of a transmission line for transmitting power to the card power supply 21. A power supply circuit 14 monitors the power supply voltage of the card power supply 21, and when the power supply voltage of the card power supply 21 is dropped lower than a previously set prescribed voltage is detected, the output side of the circuit 14, i.e. the transmission line of a card reset signal 22, is set to a lower level. Consequently, the release of the card reset signal 22 is inhibited. Thereby, the writing/reading operation of data information is stopped and the previously stored data contents are protected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62193640A JP2637109B2 (en) | 1987-08-04 | 1987-08-04 | Processing unit for portable media |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62193640A JP2637109B2 (en) | 1987-08-04 | 1987-08-04 | Processing unit for portable media |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6437685A true JPS6437685A (en) | 1989-02-08 |
JP2637109B2 JP2637109B2 (en) | 1997-08-06 |
Family
ID=16311303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62193640A Expired - Fee Related JP2637109B2 (en) | 1987-08-04 | 1987-08-04 | Processing unit for portable media |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2637109B2 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6119835U (en) * | 1984-07-09 | 1986-02-05 | 株式会社明電舎 | Computer DC power supply monitoring device |
JPS6244348U (en) * | 1985-09-03 | 1987-03-17 | ||
JPS62105293A (en) * | 1985-10-31 | 1987-05-15 | Toshiba Corp | Reading/writing device for portable recording medium |
-
1987
- 1987-08-04 JP JP62193640A patent/JP2637109B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6119835U (en) * | 1984-07-09 | 1986-02-05 | 株式会社明電舎 | Computer DC power supply monitoring device |
JPS6244348U (en) * | 1985-09-03 | 1987-03-17 | ||
JPS62105293A (en) * | 1985-10-31 | 1987-05-15 | Toshiba Corp | Reading/writing device for portable recording medium |
Also Published As
Publication number | Publication date |
---|---|
JP2637109B2 (en) | 1997-08-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |