JPS5553717A - Reset circuit - Google Patents

Reset circuit

Info

Publication number
JPS5553717A
JPS5553717A JP12736878A JP12736878A JPS5553717A JP S5553717 A JPS5553717 A JP S5553717A JP 12736878 A JP12736878 A JP 12736878A JP 12736878 A JP12736878 A JP 12736878A JP S5553717 A JPS5553717 A JP S5553717A
Authority
JP
Japan
Prior art keywords
microprocessor
power voltage
voltage
value
voltage drop
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
JP12736878A
Other languages
Japanese (ja)
Inventor
Masanobu Nagaoka
Kanji Yamamoto
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 JP12736878A priority Critical patent/JPS5553717A/en
Publication of JPS5553717A publication Critical patent/JPS5553717A/en
Pending legal-status Critical Current

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  • Safety Devices In Control Systems (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE: To avoid the malfunction of the program progress which occurs when the power voltage becomes less than the fixed voltage level by applying the resetting to the microprocessor before the power voltage becomes less than the fixed voltage level.
CONSTITUTION: The operation voltage of the microprocessor is supposed to be V1WV2, and Zener diode 5 is set to feature the voltage drop of V5<V1. At the same time, the ratio is set so that the value of the voltage drop of resistance 3 may secure V3=V1.R3/(R2+R3)=V5(R2, R3: resistance value of resistances 2 and 3) when the value of power voltage VDD becomes to V1. In such circuit, point A features a low potential under VDD<V1 with use of comparator 6. In this connection, the resetting can be applied to the microprocessor by connecting terminal A to the reset terminal of the microprocessor thus to secure the initial state for the microprocessor. In this way, the malfunction caused by the power voltage drop can be avoided.
COPYRIGHT: (C)1980,JPO&Japio
JP12736878A 1978-10-18 1978-10-18 Reset circuit Pending JPS5553717A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12736878A JPS5553717A (en) 1978-10-18 1978-10-18 Reset circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12736878A JPS5553717A (en) 1978-10-18 1978-10-18 Reset circuit

Publications (1)

Publication Number Publication Date
JPS5553717A true JPS5553717A (en) 1980-04-19

Family

ID=14958231

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12736878A Pending JPS5553717A (en) 1978-10-18 1978-10-18 Reset circuit

Country Status (1)

Country Link
JP (1) JPS5553717A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5919145U (en) * 1982-07-30 1984-02-06 株式会社日本医療器研究所 Replacement support bracket for Illigator hanger pillar
JPS5943778A (en) * 1982-09-07 1984-03-10 株式会社東芝 Controller for elevator
JPS59189335U (en) * 1983-06-02 1984-12-15 シャープ株式会社 Auto clear circuit
JPS62120715A (en) * 1985-11-20 1987-06-02 Tokyo Electric Co Ltd Reset signal generating circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5919145U (en) * 1982-07-30 1984-02-06 株式会社日本医療器研究所 Replacement support bracket for Illigator hanger pillar
JPS6122594Y2 (en) * 1982-07-30 1986-07-07
JPS5943778A (en) * 1982-09-07 1984-03-10 株式会社東芝 Controller for elevator
JPS59189335U (en) * 1983-06-02 1984-12-15 シャープ株式会社 Auto clear circuit
JPS62120715A (en) * 1985-11-20 1987-06-02 Tokyo Electric Co Ltd Reset signal generating circuit

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