JPS6479894A - Method for detecting disconnection of ic card - Google Patents

Method for detecting disconnection of ic card

Info

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
Application number
JP62236295A
Other languages
Japanese (ja)
Inventor
Takehiro Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP62236295A priority Critical patent/JPS6479894A/en
Publication of JPS6479894A publication Critical patent/JPS6479894A/en
Pending legal-status Critical Current

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.
JP62236295A 1987-09-22 1987-09-22 Method for detecting disconnection of ic card Pending JPS6479894A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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

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