JPS644801A - Malfunction preventing device for microcomputer for automobile - Google Patents

Malfunction preventing device for microcomputer for automobile

Info

Publication number
JPS644801A
JPS644801A JP15976387A JP15976387A JPS644801A JP S644801 A JPS644801 A JP S644801A JP 15976387 A JP15976387 A JP 15976387A JP 15976387 A JP15976387 A JP 15976387A JP S644801 A JPS644801 A JP S644801A
Authority
JP
Japan
Prior art keywords
cpu
time
clock
reset state
output
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.)
Granted
Application number
JP15976387A
Other languages
Japanese (ja)
Other versions
JP2537366B2 (en
Inventor
Naomi Tomizawa
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
Japan Electronic Control Systems 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
Application filed by Japan Electronic Control Systems Co Ltd filed Critical Japan Electronic Control Systems Co Ltd
Priority to JP62159763A priority Critical patent/JP2537366B2/en
Publication of JPS644801A publication Critical patent/JPS644801A/en
Application granted granted Critical
Publication of JP2537366B2 publication Critical patent/JP2537366B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Safety Devices In Control Systems (AREA)

Abstract

PURPOSE:To set the time of system-down to the minimum required, by delaying a crystal oscillation stable waiting time only when a clock has disappeared, and releasing a reset state, at the time of releasing the CPU reset state caused by an instantaneous drop of a CPU operation power supply voltage. CONSTITUTION:A clock disappearance detecting circuit 6 monitors a clock signal of a CPU 1. When the clock signal is being generated normally, an integral output voltage of an integration circuit 7 is high, and an output of a comparing circuit 8 is not varied, therefore, changeover switches 4, 5 are held at an (a) position. Accordingly, in this case, when a CPU operation power supply voltage VCC is recovered to a prescribed deciding level voltage V1 and an output of a comparing circuit 3 is inverted to an H level, it is sent as it is to the CPU 1, as a reset release signal, and a reset state is released. In such a way, the time of system-down is minimized.
JP62159763A 1987-06-29 1987-06-29 Malfunction prevention device for automobile micro-computer Expired - Fee Related JP2537366B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62159763A JP2537366B2 (en) 1987-06-29 1987-06-29 Malfunction prevention device for automobile micro-computer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62159763A JP2537366B2 (en) 1987-06-29 1987-06-29 Malfunction prevention device for automobile micro-computer

Publications (2)

Publication Number Publication Date
JPS644801A true JPS644801A (en) 1989-01-10
JP2537366B2 JP2537366B2 (en) 1996-09-25

Family

ID=15700733

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62159763A Expired - Fee Related JP2537366B2 (en) 1987-06-29 1987-06-29 Malfunction prevention device for automobile micro-computer

Country Status (1)

Country Link
JP (1) JP2537366B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001038909A1 (en) * 1999-11-24 2001-05-31 Mitsubishi Cable Industries, Ltd. Coated optical fiber, optical fiber assembly, methods for the same, and optical fiber substrate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5519257U (en) * 1978-07-24 1980-02-06
JPS5819301U (en) * 1981-07-31 1983-02-05 ヤンマー農機株式会社 work machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5519257U (en) * 1978-07-24 1980-02-06
JPS5819301U (en) * 1981-07-31 1983-02-05 ヤンマー農機株式会社 work machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001038909A1 (en) * 1999-11-24 2001-05-31 Mitsubishi Cable Industries, Ltd. Coated optical fiber, optical fiber assembly, methods for the same, and optical fiber substrate

Also Published As

Publication number Publication date
JP2537366B2 (en) 1996-09-25

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees