JPS5515531A - Malfunction prevention circuit of microcomputer - Google Patents

Malfunction prevention circuit of microcomputer

Info

Publication number
JPS5515531A
JPS5515531A JP8743778A JP8743778A JPS5515531A JP S5515531 A JPS5515531 A JP S5515531A JP 8743778 A JP8743778 A JP 8743778A JP 8743778 A JP8743778 A JP 8743778A JP S5515531 A JPS5515531 A JP S5515531A
Authority
JP
Japan
Prior art keywords
circuit
program
microcomputer
μcpu1
control
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
JP8743778A
Other languages
Japanese (ja)
Inventor
Yoshito Tabuchi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP8743778A priority Critical patent/JPS5515531A/en
Publication of JPS5515531A publication Critical patent/JPS5515531A/en
Pending legal-status Critical Current

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  • Debugging And Monitoring (AREA)

Abstract

PURPOSE: To improve reliability by preventing a program from getting out of control due to a noise, by periodically making the program of a microcomputer return to a fixed address by inputting a constant-perid pulse.
CONSTITUTION: A signal generated by oscillation circuit 3 is inputted to microcomputer μCPU1 via differentiating circuit 4. In μCPU1, its program returns to a specific address periodically by this signal and even if a noise causes the program to get out of control, it can be prevented at this point in time. In addition, the oscillation period of circuit 3 is set shorter than the delay time of the transfer of the whole output circuit of control circuit 2 so as to prevent influence of the malfunction of μCPU1 from appearing outside of circuit 2.
COPYRIGHT: (C)1980,JPO&Japio
JP8743778A 1978-07-17 1978-07-17 Malfunction prevention circuit of microcomputer Pending JPS5515531A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8743778A JPS5515531A (en) 1978-07-17 1978-07-17 Malfunction prevention circuit of microcomputer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8743778A JPS5515531A (en) 1978-07-17 1978-07-17 Malfunction prevention circuit of microcomputer

Publications (1)

Publication Number Publication Date
JPS5515531A true JPS5515531A (en) 1980-02-02

Family

ID=13914832

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8743778A Pending JPS5515531A (en) 1978-07-17 1978-07-17 Malfunction prevention circuit of microcomputer

Country Status (1)

Country Link
JP (1) JPS5515531A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5637937A (en) * 1979-08-31 1981-04-11 Ricoh Co Ltd Paper feeder for photocopier or the like
JPS59108928U (en) * 1983-01-13 1984-07-23 カルソニックカンセイ株式会社 Malfunction prevention circuit for electronic circuit systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5637937A (en) * 1979-08-31 1981-04-11 Ricoh Co Ltd Paper feeder for photocopier or the like
JPS59108928U (en) * 1983-01-13 1984-07-23 カルソニックカンセイ株式会社 Malfunction prevention circuit for electronic circuit systems

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