JPS5518732A - Malfunction prevention circuit of microprocessor - Google Patents

Malfunction prevention circuit of microprocessor

Info

Publication number
JPS5518732A
JPS5518732A JP9047578A JP9047578A JPS5518732A JP S5518732 A JPS5518732 A JP S5518732A JP 9047578 A JP9047578 A JP 9047578A JP 9047578 A JP9047578 A JP 9047578A JP S5518732 A JPS5518732 A JP S5518732A
Authority
JP
Japan
Prior art keywords
μpc
voltage
circuit
potential
reset
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
JP9047578A
Other languages
Japanese (ja)
Inventor
Masahiro Hagita
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 JP9047578A priority Critical patent/JPS5518732A/en
Publication of JPS5518732A publication Critical patent/JPS5518732A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE: To prevent microporcessor μPC from malfunctioning by applying a reset potential to the reset terminal of μPC more rapidly than a regulated power voltage drops down to the malfunction generating voltage of μPC.
CONSTITUTION: The commercial power voltage is rectified 2 via transformer 3, stabilized by voltage stabilizer circuit 4 and applied to power terminal VDD of IC circuit 1 including μPC. When the commercial power supply is cut off momentarily, the potential of terminal VDD of IC circuit 1 drops down to a voltage where μPC may malfunction, but before it, detection circuit 5 composed of Zener diode 52, resistances 53 and 54, and Tr51 detects a drop in the collector potential, unstable potential, of transistor Tr41. This detection voltage holds reset terminal (b) of circuit 1 at a reset potential. Consequently, a digital display unit, etc., controlled by μPC1 can be prevented from malfunctioning in the break of a commercial power supply.
COPYRIGHT: (C)1980,JPO&Japio
JP9047578A 1978-07-26 1978-07-26 Malfunction prevention circuit of microprocessor Pending JPS5518732A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9047578A JPS5518732A (en) 1978-07-26 1978-07-26 Malfunction prevention circuit of microprocessor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9047578A JPS5518732A (en) 1978-07-26 1978-07-26 Malfunction prevention circuit of microprocessor

Publications (1)

Publication Number Publication Date
JPS5518732A true JPS5518732A (en) 1980-02-09

Family

ID=13999601

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9047578A Pending JPS5518732A (en) 1978-07-26 1978-07-26 Malfunction prevention circuit of microprocessor

Country Status (1)

Country Link
JP (1) JPS5518732A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5948141U (en) * 1982-09-20 1984-03-30 日本ビクター株式会社 load disconnect circuit
JPH0236199U (en) * 1988-08-31 1990-03-08
JP2001046605A (en) * 1999-08-13 2001-02-20 Sankyo Kk Game machine
JP2001079245A (en) * 1999-09-10 2001-03-27 Sankyo Kk Game machine
JP2001149621A (en) * 1999-11-25 2001-06-05 Sankyo Kk Game machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5948141U (en) * 1982-09-20 1984-03-30 日本ビクター株式会社 load disconnect circuit
JPH0236199U (en) * 1988-08-31 1990-03-08
JP2001046605A (en) * 1999-08-13 2001-02-20 Sankyo Kk Game machine
JP2001079245A (en) * 1999-09-10 2001-03-27 Sankyo Kk Game machine
JP2001149621A (en) * 1999-11-25 2001-06-05 Sankyo Kk Game machine

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