JPS6486287A - Method for supervising battery life of ic memory card - Google Patents

Method for supervising battery life of ic memory card

Info

Publication number
JPS6486287A
JPS6486287A JP62244479A JP24447987A JPS6486287A JP S6486287 A JPS6486287 A JP S6486287A JP 62244479 A JP62244479 A JP 62244479A JP 24447987 A JP24447987 A JP 24447987A JP S6486287 A JPS6486287 A JP S6486287A
Authority
JP
Japan
Prior art keywords
time
battery
supervising
card
life
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
JP62244479A
Other languages
Japanese (ja)
Inventor
Kaname Iijima
Hiroshi Matsumaru
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Ltd filed Critical Hitachi Ltd
Priority to JP62244479A priority Critical patent/JPS6486287A/en
Publication of JPS6486287A publication Critical patent/JPS6486287A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To inform a user of the exchange time of a battery by storing battery life time data to an IC card and supervising a life time every time the card is connected to a card reader/writer. CONSTITUTION:When an IC memory card 32 is connected to a card reader/ writer 10, whether the life time data of a battery 44 is stored to registers 36, 38 and 40 or not is decided. When the time data are stored, the contents of the respective registers are read. A using start time TS and a life time TB are read from the register 36. A back-up unnecessary time TU is fetched from the register 38. Next, a present time TR is fetched from a present time timer 18 and the operation of TR-TS-TU is executed. The operated time and a time, which subtracts the period of grace alpha from the life time TB of the battery, are compared and the usable time of the battery is obtained.
JP62244479A 1987-09-29 1987-09-29 Method for supervising battery life of ic memory card Pending JPS6486287A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62244479A JPS6486287A (en) 1987-09-29 1987-09-29 Method for supervising battery life of ic memory card

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62244479A JPS6486287A (en) 1987-09-29 1987-09-29 Method for supervising battery life of ic memory card

Publications (1)

Publication Number Publication Date
JPS6486287A true JPS6486287A (en) 1989-03-30

Family

ID=17119277

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62244479A Pending JPS6486287A (en) 1987-09-29 1987-09-29 Method for supervising battery life of ic memory card

Country Status (1)

Country Link
JP (1) JPS6486287A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4839208A (en) * 1986-04-30 1989-06-13 Nec Corporation Optical information recording medium
JPH04119490A (en) * 1990-09-10 1992-04-20 Matsushita Graphic Commun Syst Inc Ic card and ic card driving device using the card

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6188653A (en) * 1984-10-05 1986-05-06 Fujitsu Ltd Detecting method of battery lifetime
JPS61188612A (en) * 1985-02-18 1986-08-22 Sanyo Electric Co Ltd Memory backup supervising system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6188653A (en) * 1984-10-05 1986-05-06 Fujitsu Ltd Detecting method of battery lifetime
JPS61188612A (en) * 1985-02-18 1986-08-22 Sanyo Electric Co Ltd Memory backup supervising system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4839208A (en) * 1986-04-30 1989-06-13 Nec Corporation Optical information recording medium
JPH04119490A (en) * 1990-09-10 1992-04-20 Matsushita Graphic Commun Syst Inc Ic card and ic card driving device using the card

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