JPS57125423A - Power supply device for battery driven microcomputer - Google Patents

Power supply device for battery driven microcomputer

Info

Publication number
JPS57125423A
JPS57125423A JP56012158A JP1215881A JPS57125423A JP S57125423 A JPS57125423 A JP S57125423A JP 56012158 A JP56012158 A JP 56012158A JP 1215881 A JP1215881 A JP 1215881A JP S57125423 A JPS57125423 A JP S57125423A
Authority
JP
Japan
Prior art keywords
turned
power supply
cpu1
signal
battery
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
JP56012158A
Other languages
Japanese (ja)
Inventor
Kozo Uga
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.)
Jeco Corp
Original Assignee
Jeco Corp
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 Jeco Corp filed Critical Jeco Corp
Priority to JP56012158A priority Critical patent/JPS57125423A/en
Publication of JPS57125423A publication Critical patent/JPS57125423A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Power Sources (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

PURPOSE:To reduce the power consumption, by cutting off the power supply with a signal accompanied with the processing end of a CPU when the CPU terminates all processings after turning off an external operation switch. CONSTITUTION:When an ignition switch 16 is turned on, an FF19 is set by a ''1'' signal accompanied with this turn-on operation, and transistors TRs 11 and 12 are turned on by the ''1'' Q output. Therefore, the power source voltage from a battery 9 is supplied to start a CPU1. When the switch 16 is turned off in accordance with the running stop of a car, the CPU1 not only writes processing data in a RAM 3 but also outputs a ''1'' signal to an external output terminal P2 of a programmable input/output port 4 when the CPU1 terminates all processings after discriminating that signals inputted to external input terminals P0 and P1 of the port 4 are ''0''. The FF19 is reset by this outputted signal, and therefore, TRs 11 and 12 are turned off to cut off the power supply of the battery 9.
JP56012158A 1981-01-28 1981-01-28 Power supply device for battery driven microcomputer Pending JPS57125423A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56012158A JPS57125423A (en) 1981-01-28 1981-01-28 Power supply device for battery driven microcomputer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56012158A JPS57125423A (en) 1981-01-28 1981-01-28 Power supply device for battery driven microcomputer

Publications (1)

Publication Number Publication Date
JPS57125423A true JPS57125423A (en) 1982-08-04

Family

ID=11797645

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56012158A Pending JPS57125423A (en) 1981-01-28 1981-01-28 Power supply device for battery driven microcomputer

Country Status (1)

Country Link
JP (1) JPS57125423A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60143050A (en) * 1983-10-07 1985-07-29 エセツクス・グル−プ・インコ−ポレイテツド Control system
EP0184758A2 (en) * 1984-12-07 1986-06-18 Hitachi, Ltd. Vehicle height adjusting device
JPS6458004A (en) * 1987-08-28 1989-03-06 Kubota Ltd Control circuit
JP2006323822A (en) * 2005-04-20 2006-11-30 Denso Corp Electronic control apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5299020A (en) * 1976-02-17 1977-08-19 Casio Comput Co Ltd Power supply breaking system for electronic device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5299020A (en) * 1976-02-17 1977-08-19 Casio Comput Co Ltd Power supply breaking system for electronic device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60143050A (en) * 1983-10-07 1985-07-29 エセツクス・グル−プ・インコ−ポレイテツド Control system
JPH0469465B2 (en) * 1983-10-07 1992-11-06 Essex Group
EP0184758A2 (en) * 1984-12-07 1986-06-18 Hitachi, Ltd. Vehicle height adjusting device
JPS6458004A (en) * 1987-08-28 1989-03-06 Kubota Ltd Control circuit
JP2006323822A (en) * 2005-04-20 2006-11-30 Denso Corp Electronic control apparatus

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