JPS54125932A - Protective device for memory unit - Google Patents

Protective device for memory unit

Info

Publication number
JPS54125932A
JPS54125932A JP3386578A JP3386578A JPS54125932A JP S54125932 A JPS54125932 A JP S54125932A JP 3386578 A JP3386578 A JP 3386578A JP 3386578 A JP3386578 A JP 3386578A JP S54125932 A JPS54125932 A JP S54125932A
Authority
JP
Japan
Prior art keywords
unit
time
memory unit
power supply
circuit
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
JP3386578A
Other languages
Japanese (ja)
Inventor
Tsuneo Hirose
Kazuhiro Murase
Toshiaki Nagasawa
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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
Priority to CA313,747A priority Critical patent/CA1113407A/en
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP3386578A priority patent/JPS54125932A/en
Publication of JPS54125932A publication Critical patent/JPS54125932A/en
Pending legal-status Critical Current

Links

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  • Power Sources (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)

Abstract

PURPOSE: To prevent the breakdown of the contents of the memory unit when the main power supply is cut off by controlling the power supply ON and OFF of the peripheral circuit groups via the 1st control circuit and also controlling the capability and incapability of the writing to the memory unit via the 2nd control circuit.
CONSTITUTION: Output signal 50 of 1st control circuit 3 is connected so as to control the ON and OFF of power switch 5 of peripheral circuit group 6; while output signal 51 of 2nd control circuit 4 is connected to control the writing capability and incapability for memory unit 7 respectively. In this case, the power supply of unit 7 is always connected. When main power switch 2 is turned on at time t1, circuit 3 operates at time t2 after a fixed time. Thus, signal 50 becomes H, and switch 5 is turned on to supply power 1 to unit 6. And it takes sometime to give the correct operation to unit 6 after connection of the power supply, so circuit 4 operates at time t3 after a fixed time from the correct operation of unit 6 in order to set signal 51 at H. Thus, the system is put under the correct using state after time t3.
COPYRIGHT: (C)1979,JPO&Japio
JP3386578A 1977-10-19 1978-03-23 Protective device for memory unit Pending JPS54125932A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA313,747A CA1113407A (en) 1977-10-19 1977-10-19 Stationary record player
JP3386578A JPS54125932A (en) 1978-03-23 1978-03-23 Protective device for memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3386578A JPS54125932A (en) 1978-03-23 1978-03-23 Protective device for memory unit

Publications (1)

Publication Number Publication Date
JPS54125932A true JPS54125932A (en) 1979-09-29

Family

ID=12398385

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3386578A Pending JPS54125932A (en) 1977-10-19 1978-03-23 Protective device for memory unit

Country Status (1)

Country Link
JP (1) JPS54125932A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57138098A (en) * 1981-02-19 1982-08-26 Fuji Electric Co Ltd Mis-write preventing circuit in main power supply failure
JPS6044141U (en) * 1983-08-30 1985-03-28 株式会社山武 Power outage detection memory backup device
JPS63181017A (en) * 1987-01-22 1988-07-26 Matsushita Electric Ind Co Ltd Data backup device
US5691947A (en) * 1992-12-18 1997-11-25 Motorola Inc. Multiplexed programming voltage and status over single conductor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57138098A (en) * 1981-02-19 1982-08-26 Fuji Electric Co Ltd Mis-write preventing circuit in main power supply failure
JPS6044141U (en) * 1983-08-30 1985-03-28 株式会社山武 Power outage detection memory backup device
JPS63181017A (en) * 1987-01-22 1988-07-26 Matsushita Electric Ind Co Ltd Data backup device
US5691947A (en) * 1992-12-18 1997-11-25 Motorola Inc. Multiplexed programming voltage and status over single conductor

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