JPS55123716A - Malfunction prevention unit of control system - Google Patents

Malfunction prevention unit of control system

Info

Publication number
JPS55123716A
JPS55123716A JP3078479A JP3078479A JPS55123716A JP S55123716 A JPS55123716 A JP S55123716A JP 3078479 A JP3078479 A JP 3078479A JP 3078479 A JP3078479 A JP 3078479A JP S55123716 A JPS55123716 A JP S55123716A
Authority
JP
Japan
Prior art keywords
output
circuit
clear
comparator
power supply
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
JP3078479A
Other languages
Japanese (ja)
Inventor
Kenji Shoroji
Satoshi Kuroda
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP3078479A priority Critical patent/JPS55123716A/en
Publication of JPS55123716A publication Critical patent/JPS55123716A/en
Pending legal-status Critical Current

Links

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  • Electronic Switches (AREA)
  • Power Sources (AREA)

Abstract

PURPOSE: To prevent surely the malfunction with a simple constitution at a power supply and break time, by providing an erroneous output prevention circuit to input a clear signal to the clear terminal of an output control circuit.
CONSTITUTION: An erroneous output prevention circuit is so constituted that a time delay circuit consisting of resistance 11 and capacitor 12 and a reference voltage generating circuit consisting of Zener diode 15 may be connected to a power source bus and output voltage V1 and V2 of both circuits may be inputted to comparator 16. The output of comparator 16 is supplied to the clear terminal of the output control circuit of a CPU. By this constitution, a fixed time determined by the time delay circuit after power supply is held under the state of voltages V1<V2, and this state is held immediately after power break. Consequently, circuit 3 generates a clear signal in the fixed period after power supply and immediately after power break due to output 0 of comparator 16, and this clear signal is sent to the output control circuit to clear respective output circuits. Thus, the erroneous output is the unstable period accompanied with switching of the power source is prevented from being generated.
COPYRIGHT: (C)1980,JPO&Japio
JP3078479A 1979-03-16 1979-03-16 Malfunction prevention unit of control system Pending JPS55123716A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3078479A JPS55123716A (en) 1979-03-16 1979-03-16 Malfunction prevention unit of control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3078479A JPS55123716A (en) 1979-03-16 1979-03-16 Malfunction prevention unit of control system

Publications (1)

Publication Number Publication Date
JPS55123716A true JPS55123716A (en) 1980-09-24

Family

ID=12313292

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3078479A Pending JPS55123716A (en) 1979-03-16 1979-03-16 Malfunction prevention unit of control system

Country Status (1)

Country Link
JP (1) JPS55123716A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57104882A (en) * 1980-12-22 1982-06-30 Seiko Epson Corp Power on clear circuit in electronic watch
JPS59189335U (en) * 1983-06-02 1984-12-15 シャープ株式会社 Auto clear circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57104882A (en) * 1980-12-22 1982-06-30 Seiko Epson Corp Power on clear circuit in electronic watch
JPS59189335U (en) * 1983-06-02 1984-12-15 シャープ株式会社 Auto clear circuit

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