JPS6479894A - Method for detecting disconnection of ic card - Google Patents
Method for detecting disconnection of ic cardInfo
- Publication number
- JPS6479894A JPS6479894A JP62236295A JP23629587A JPS6479894A JP S6479894 A JPS6479894 A JP S6479894A JP 62236295 A JP62236295 A JP 62236295A JP 23629587 A JP23629587 A JP 23629587A JP S6479894 A JPS6479894 A JP S6479894A
- Authority
- JP
- Japan
- Prior art keywords
- data
- signal line
- line
- microprocessor
- disconnected
- 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.)
- Pending
Links
Abstract
PURPOSE:To improve the reliability of an IC card by turning a nonvolatile memory to a write inhibiting state, outputting inspection data from a microprocessor to a data signal line and immediately deciding the contents of the read data to detect the existence of disconnection on a data signal line. CONSTITUTION:The microprocessor 2 outputs an address signal, turns the inverse of CE and the inverse of OE to high levels and outputs data A to a signal line 1. Consequently, the memory 3 is turned to a data write/read inhibiting state and the data A is outputted only to the signal line 1. When the microprocessor 2 compares data A' read out immediately after outputting the data A with data B' read out immediately after outputting data B, bits '0', '1' read out from the disconnected line of the data signal line 1 are in different levels and the contents of the data A', B' are different, so that whether a disconnected line exists in the data signal line 1 or not and which line is disconnected can be detected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62236295A JPS6479894A (en) | 1987-09-22 | 1987-09-22 | Method for detecting disconnection of ic card |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62236295A JPS6479894A (en) | 1987-09-22 | 1987-09-22 | Method for detecting disconnection of ic card |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6479894A true JPS6479894A (en) | 1989-03-24 |
Family
ID=16998674
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62236295A Pending JPS6479894A (en) | 1987-09-22 | 1987-09-22 | Method for detecting disconnection of ic card |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6479894A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5775413A (en) * | 1995-09-14 | 1998-07-07 | Sanyo Electric Co., Ltd. | Heat exchanger having corrugated fins and air conditioner having the same |
JP2010287182A (en) * | 2009-06-15 | 2010-12-24 | Murata Mfg Co Ltd | Device for confirming operation of wireless tag, method for confirming operation of the wireless tag, and computer program |
-
1987
- 1987-09-22 JP JP62236295A patent/JPS6479894A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5775413A (en) * | 1995-09-14 | 1998-07-07 | Sanyo Electric Co., Ltd. | Heat exchanger having corrugated fins and air conditioner having the same |
JP2010287182A (en) * | 2009-06-15 | 2010-12-24 | Murata Mfg Co Ltd | Device for confirming operation of wireless tag, method for confirming operation of the wireless tag, and computer program |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS56140452A (en) | Memory protection system | |
JPS6476596A (en) | Error of eeprom detecting device | |
MX9806203A (en) | Capacitive data card and reader thereof. | |
US5166503A (en) | IC memory card | |
TW371339B (en) | Testing of memory content | |
US6311246B1 (en) | IC with dual function clock and device ID circuit | |
JPS6479894A (en) | Method for detecting disconnection of ic card | |
WO2001037076A3 (en) | Method and apparatus for ring buffer flow error detection | |
JPS5680872A (en) | Buffer memory control system | |
SE9401318D0 (en) | Method for monitoring a memory and circuitry for this | |
JPS5792499A (en) | Directory device | |
CA2340633A1 (en) | Memory supervision | |
JPS5744294A (en) | Alternating memory control system | |
KR950034262A (en) | Low Power Consumption Semiconductor Memory Device | |
KR910012972A (en) | Write malfunction prevention circuit, memory device and data processing device having same | |
EP0124238A3 (en) | Memory-based digital word sequence recognizer | |
JPS6423354A (en) | Duplex buffer memory control system | |
JPS57200999A (en) | Memory circuit checking system | |
JPS5736500A (en) | Memory check system | |
JPS6448152A (en) | Memory write protection system | |
JPS5617442A (en) | Parity error processing system | |
JPS6432357A (en) | Fault processing system | |
JPS56145600A (en) | Detection system for memory destruction | |
JPS55139699A (en) | Error detection system of memory unit | |
JPS647240A (en) | Memory capacity discriminating method for memory card |