JPS5580133A - Power failure detection circuit - Google Patents

Power failure detection circuit

Info

Publication number
JPS5580133A
JPS5580133A JP15562178A JP15562178A JPS5580133A JP S5580133 A JPS5580133 A JP S5580133A JP 15562178 A JP15562178 A JP 15562178A JP 15562178 A JP15562178 A JP 15562178A JP S5580133 A JPS5580133 A JP S5580133A
Authority
JP
Japan
Prior art keywords
mcon
power
detection circuit
voltage
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.)
Granted
Application number
JP15562178A
Other languages
Japanese (ja)
Other versions
JPS5651372B2 (en
Inventor
Suke Ishimoto
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
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP15562178A priority Critical patent/JPS5580133A/en
Publication of JPS5580133A publication Critical patent/JPS5580133A/en
Publication of JPS5651372B2 publication Critical patent/JPS5651372B2/ja
Granted legal-status Critical Current

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Abstract

PURPOSE: To execute a program normally all the time by initializing a computer securely at adequate time after power is turned OFF in case of a momentary power failure or power break of a controller using a one-chip microcomputer.
CONSTITUTION: Between the power input terminal of constant-volgate circuit PS supplying power to one-chip microcomputer MCON and MCON, voltage detection circuit CCT1 is connected. This voltage detection circuit CCT1 absorbs variation in input to constant-voltage circuit PS and detects voltages across a rectifier circuit and smoothing circuit approximating to a regulation start voltage, and the output of voltage detection circuit CCT1 turns transistor TrQ4 ON to discharge capacitor C1. Then, a potential at terminal INIT of MCON is nearly equalized to voltage Vss within fixed time to obtain fixed characteristics as to a rise when power supply AC100V is turned ON, and MCON is initialized to executing a program in a normal state all the time.
COPYRIGHT: (C)1980,JPO&Japio
JP15562178A 1978-12-14 1978-12-14 Power failure detection circuit Granted JPS5580133A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15562178A JPS5580133A (en) 1978-12-14 1978-12-14 Power failure detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15562178A JPS5580133A (en) 1978-12-14 1978-12-14 Power failure detection circuit

Publications (2)

Publication Number Publication Date
JPS5580133A true JPS5580133A (en) 1980-06-17
JPS5651372B2 JPS5651372B2 (en) 1981-12-04

Family

ID=15610000

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15562178A Granted JPS5580133A (en) 1978-12-14 1978-12-14 Power failure detection circuit

Country Status (1)

Country Link
JP (1) JPS5580133A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01216417A (en) * 1988-02-24 1989-08-30 Matsushita Electric Works Ltd Reset circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4817886U (en) * 1971-07-10 1973-02-28
JPS4828807A (en) * 1971-08-16 1973-04-17
JPS53106524A (en) * 1977-03-01 1978-09-16 Toshiba Corp Initial clear unit for digital circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4817886U (en) * 1971-07-10 1973-02-28
JPS4828807A (en) * 1971-08-16 1973-04-17
JPS53106524A (en) * 1977-03-01 1978-09-16 Toshiba Corp Initial clear unit for digital circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01216417A (en) * 1988-02-24 1989-08-30 Matsushita Electric Works Ltd Reset circuit

Also Published As

Publication number Publication date
JPS5651372B2 (en) 1981-12-04

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