JPS57164320A - Reset system for microprocessor - Google Patents

Reset system for microprocessor

Info

Publication number
JPS57164320A
JPS57164320A JP56049769A JP4976981A JPS57164320A JP S57164320 A JPS57164320 A JP S57164320A JP 56049769 A JP56049769 A JP 56049769A JP 4976981 A JP4976981 A JP 4976981A JP S57164320 A JPS57164320 A JP S57164320A
Authority
JP
Japan
Prior art keywords
microprocessor
monostable multivibrator
given
time
time constant
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
JP56049769A
Other languages
Japanese (ja)
Inventor
Yuji Kubota
Tomoyuki Kodaira
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP56049769A priority Critical patent/JPS57164320A/en
Publication of JPS57164320A publication Critical patent/JPS57164320A/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 reduce the period in failure, by immediately resetting a microprocessor without giving effect on the content of a read/write memory connected to the microprocessor, if normal program can not be executed. CONSTITUTION:When addresses are outputted from a microprocessor 5, a specific address is selected with a decoder 16. This is ANDed with an input and output write signal at a gate circuit 17, and given to a retriggerable monostable multivibrator 11. The time constant of the monostable multivibrator 11 is set longer than a time of program scanning. If a failure takes place and a trigger signal is not given to the monostable multivibrator 11, after a time determined by the time constant, the monostable multivibrator is inverted, the output drives flip-flops 12 and 13 and a reset signal is given to a reset terminal 6 of the microprocessor 5.
JP56049769A 1981-04-02 1981-04-02 Reset system for microprocessor Pending JPS57164320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56049769A JPS57164320A (en) 1981-04-02 1981-04-02 Reset system for microprocessor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56049769A JPS57164320A (en) 1981-04-02 1981-04-02 Reset system for microprocessor

Publications (1)

Publication Number Publication Date
JPS57164320A true JPS57164320A (en) 1982-10-08

Family

ID=12840370

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56049769A Pending JPS57164320A (en) 1981-04-02 1981-04-02 Reset system for microprocessor

Country Status (1)

Country Link
JP (1) JPS57164320A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59225418A (en) * 1983-06-03 1984-12-18 Koito Mfg Co Ltd Power supply controlling circuit
JPS605532U (en) * 1983-06-23 1985-01-16 株式会社山武 Processor operation monitoring circuit
JPS61208550A (en) * 1985-03-13 1986-09-16 Nec Corp Emulator for microcomputer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59225418A (en) * 1983-06-03 1984-12-18 Koito Mfg Co Ltd Power supply controlling circuit
JPS605532U (en) * 1983-06-23 1985-01-16 株式会社山武 Processor operation monitoring circuit
JPS61208550A (en) * 1985-03-13 1986-09-16 Nec Corp Emulator for microcomputer
JPH0456342B2 (en) * 1985-03-13 1992-09-08 Nippon Electric Co

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