JPS57134731A - Reset circuit for central processing unit - Google Patents

Reset circuit for central processing unit

Info

Publication number
JPS57134731A
JPS57134731A JP56019935A JP1993581A JPS57134731A JP S57134731 A JPS57134731 A JP S57134731A JP 56019935 A JP56019935 A JP 56019935A JP 1993581 A JP1993581 A JP 1993581A JP S57134731 A JPS57134731 A JP S57134731A
Authority
JP
Japan
Prior art keywords
output
pulse
period
monostable multivibrator
outputted
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
JP56019935A
Other languages
Japanese (ja)
Inventor
Akira Matsushita
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 JP56019935A priority Critical patent/JPS57134731A/en
Publication of JPS57134731A publication Critical patent/JPS57134731A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/24—Resetting means

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Debugging And Monitoring (AREA)

Abstract

PURPOSE:To execute a normal program, by resetting a CPU at malfunction and restoring it to the initial state, through the detection the change in the period of malfunction detecting pulse outputted from the CPU and outputting a reset pulse. CONSTITUTION:When a CPU11 outputs a period (g) shorter than a prescribed period (d), since an output pulse width (e) of a retrigger monostable multivibrator 16 is greater than the period (g) to each trigger input, an output E is at high state. Thus, a monostable multivibrator 17 taking the output E as an input has durable output of low state, and an AND circuit 19 outputs a reset pulse with an inverted output of the monostable multivibrator 17 with the output pulse of the CPU11. When a period (h) longer than the period (d) is outputted, after the pulse of the width (e) is outputted to an output of a monostable multivibrator 16, low state keeps unitl the next pulse input. Thereafter, through the similar step as above, the AND circuit 19 outputs a reset pulse.
JP56019935A 1981-02-13 1981-02-13 Reset circuit for central processing unit Pending JPS57134731A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56019935A JPS57134731A (en) 1981-02-13 1981-02-13 Reset circuit for central processing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56019935A JPS57134731A (en) 1981-02-13 1981-02-13 Reset circuit for central processing unit

Publications (1)

Publication Number Publication Date
JPS57134731A true JPS57134731A (en) 1982-08-20

Family

ID=12013063

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56019935A Pending JPS57134731A (en) 1981-02-13 1981-02-13 Reset circuit for central processing unit

Country Status (1)

Country Link
JP (1) JPS57134731A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59100958A (en) * 1982-12-02 1984-06-11 Aisin Seiki Co Ltd Runaway detecting circuit of microcomputer
JPS6143348A (en) * 1984-08-07 1986-03-01 Hitachi Ltd Fail-safe computer system
JPS61133829U (en) * 1985-02-05 1986-08-21
JPS62106524A (en) * 1985-11-01 1987-05-18 Clarion Co Ltd Microcomputer resetting circuit for on-vehicle equipment
EP0398194A2 (en) * 1989-05-19 1990-11-22 Compaq Computer Corporation Minimum reset time hold circuit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59100958A (en) * 1982-12-02 1984-06-11 Aisin Seiki Co Ltd Runaway detecting circuit of microcomputer
JPS6319896B2 (en) * 1982-12-02 1988-04-25 Aisin Seiki
JPS6143348A (en) * 1984-08-07 1986-03-01 Hitachi Ltd Fail-safe computer system
JPS61133829U (en) * 1985-02-05 1986-08-21
JPS62106524A (en) * 1985-11-01 1987-05-18 Clarion Co Ltd Microcomputer resetting circuit for on-vehicle equipment
EP0398194A2 (en) * 1989-05-19 1990-11-22 Compaq Computer Corporation Minimum reset time hold circuit
US5247654A (en) * 1989-05-19 1993-09-21 Compaq Computer Corporation Minimum reset time hold circuit for delaying the completion of a second and complementary operation

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