JPS5773432A - Malfunction preventing system of microprocessor - Google Patents

Malfunction preventing system of microprocessor

Info

Publication number
JPS5773432A
JPS5773432A JP55148786A JP14878680A JPS5773432A JP S5773432 A JPS5773432 A JP S5773432A JP 55148786 A JP55148786 A JP 55148786A JP 14878680 A JP14878680 A JP 14878680A JP S5773432 A JPS5773432 A JP S5773432A
Authority
JP
Japan
Prior art keywords
microprocessor
level
supply voltage
holding state
preventing system
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
JP55148786A
Other languages
Japanese (ja)
Inventor
Yoshinobu Tominaga
Tatsuo Nakai
Katsuo Hojo
Morihiro Kishimoto
Hiroyuki Okuma
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.)
Meisei Electric Co Ltd
Original Assignee
Meisei Electric 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 Meisei Electric Co Ltd filed Critical Meisei Electric Co Ltd
Priority to JP55148786A priority Critical patent/JPS5773432A/en
Publication of JPS5773432A publication Critical patent/JPS5773432A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Power Sources (AREA)

Abstract

PURPOSE:To prevent the malfunction of an electronic device using a microprocessor, by deteting the level reduction of a supply voltage before the voltage reaches its working threshold and keeping the microprocessor in the holding state. CONSTITUTION:When the level of a power supply voltage -EO begins to lower and then lowered down to the Zener voltage of a Zener diode Z1, the diode Z1 is turned off. Thus no current flows into the photodiode in a photocoupler PH1, and the H signal is supplied to a holding terminal HOLD of a microprocessor CPU. When the CPU judges that the holding state should be kept, then stops its operation by the fact that the level of the terminal HOLD is set at H.
JP55148786A 1980-10-23 1980-10-23 Malfunction preventing system of microprocessor Pending JPS5773432A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55148786A JPS5773432A (en) 1980-10-23 1980-10-23 Malfunction preventing system of microprocessor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55148786A JPS5773432A (en) 1980-10-23 1980-10-23 Malfunction preventing system of microprocessor

Publications (1)

Publication Number Publication Date
JPS5773432A true JPS5773432A (en) 1982-05-08

Family

ID=15460642

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55148786A Pending JPS5773432A (en) 1980-10-23 1980-10-23 Malfunction preventing system of microprocessor

Country Status (1)

Country Link
JP (1) JPS5773432A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59226918A (en) * 1983-06-07 1984-12-20 Koito Mfg Co Ltd Control circuit of microcomputer
JPS615326A (en) * 1984-06-19 1986-01-11 Matsushita Electric Ind Co Ltd Service interruption detecting circuit of controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59226918A (en) * 1983-06-07 1984-12-20 Koito Mfg Co Ltd Control circuit of microcomputer
JPS615326A (en) * 1984-06-19 1986-01-11 Matsushita Electric Ind Co Ltd Service interruption detecting circuit of controller

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