JPS57103558A - Runaway detecting circuit of processor - Google Patents

Runaway detecting circuit of processor

Info

Publication number
JPS57103558A
JPS57103558A JP55166640A JP16664080A JPS57103558A JP S57103558 A JPS57103558 A JP S57103558A JP 55166640 A JP55166640 A JP 55166640A JP 16664080 A JP16664080 A JP 16664080A JP S57103558 A JPS57103558 A JP S57103558A
Authority
JP
Japan
Prior art keywords
timer
reset
runaway
reset instruction
cpu1
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
JP55166640A
Other languages
Japanese (ja)
Inventor
Hiroya Tanaka
Joji Saito
Shigeki Yanagida
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP55166640A priority Critical patent/JPS57103558A/en
Publication of JPS57103558A publication Critical patent/JPS57103558A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
    • G06F11/0751—Error or fault detection not based on redundancy
    • G06F11/0754—Error or fault detection not based on redundancy by exceeding limits
    • G06F11/0757—Error or fault detection not based on redundancy by exceeding limits by exceeding a time limit, i.e. time-out, e.g. watchdogs

Landscapes

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

Abstract

PURPOSE:To automatically prevent the runaway of a CPU, by providing a timer that is reset by a timer reset instruction and delivering the detection of a runaway in case no timer reset instruction is received for a prescribed period of time from the resetting of the timer. CONSTITUTION:A timer reset instruction is delivered from an output OUT of a CPU1 with every step of a program executed to be applied to a reset input (r) of a self-running timer 2. The timer 2 runs by itself by the clock which is applied to a clock input cl from a clock input terminal 4 to produce a CPU reset signal at its output after having an overflow in the lapse of a prescribed time as long as the next timer reset instruction is not supplied for a prescribed period after a timer reset instruction is delivered. In other words, no timer reset instruction is applied from the output OUT when the CPU1 has a runaway, and accordingly the timer 2 has an overflow in a prescribed period. Then the CPU reset signal is produced from the output of the timer 2, and the CPU1 is reset via an OR gate 3.
JP55166640A 1980-11-28 1980-11-28 Runaway detecting circuit of processor Pending JPS57103558A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55166640A JPS57103558A (en) 1980-11-28 1980-11-28 Runaway detecting circuit of processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55166640A JPS57103558A (en) 1980-11-28 1980-11-28 Runaway detecting circuit of processor

Publications (1)

Publication Number Publication Date
JPS57103558A true JPS57103558A (en) 1982-06-28

Family

ID=15835017

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55166640A Pending JPS57103558A (en) 1980-11-28 1980-11-28 Runaway detecting circuit of processor

Country Status (1)

Country Link
JP (1) JPS57103558A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54101237A (en) * 1978-01-26 1979-08-09 Omron Tateisi Electronics Co Malfunction prevention system for electronic circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54101237A (en) * 1978-01-26 1979-08-09 Omron Tateisi Electronics Co Malfunction prevention system for electronic circuit

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