JPS54139443A - Information processor - Google Patents

Information processor

Info

Publication number
JPS54139443A
JPS54139443A JP4654278A JP4654278A JPS54139443A JP S54139443 A JPS54139443 A JP S54139443A JP 4654278 A JP4654278 A JP 4654278A JP 4654278 A JP4654278 A JP 4654278A JP S54139443 A JPS54139443 A JP S54139443A
Authority
JP
Japan
Prior art keywords
case
stop order
software
ram4
data bus
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
JP4654278A
Other languages
Japanese (ja)
Inventor
Hiroshi Ozaki
Kimiya Nishimae
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4654278A priority Critical patent/JPS54139443A/en
Publication of JPS54139443A publication Critical patent/JPS54139443A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent the runaway of the software in case the unpacked memory address is designated by providing the high resistance which changes the logic level of the data bus at the high impedance time into the level equivalent to the software stop order.
CONSTITUTION: The system comprises microprocessor 1, address decoder 2, ROM3, RAM4, output and input port 5 and 6, etc. In case such system as to process unpacked RAM4' is formed, the logic level equivalent to the software stop order is applied to each of signal lines D0WD7 constituting data bus DT via high resistances R0WR7. In other words, the other ends of R7WR4 plus R1 and R0 are connected to +5V to form "1" (+5V) in case D7WD0 are set to "1" "1" "1" "1" "0" "0" "1" "1" respectively with software stop order SWI; and the other ends of R3 and R2 can be connected to 0V to form "0".
COPYRIGHT: (C)1979,JPO&Japio
JP4654278A 1978-04-21 1978-04-21 Information processor Pending JPS54139443A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4654278A JPS54139443A (en) 1978-04-21 1978-04-21 Information processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4654278A JPS54139443A (en) 1978-04-21 1978-04-21 Information processor

Publications (1)

Publication Number Publication Date
JPS54139443A true JPS54139443A (en) 1979-10-29

Family

ID=12750178

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4654278A Pending JPS54139443A (en) 1978-04-21 1978-04-21 Information processor

Country Status (1)

Country Link
JP (1) JPS54139443A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3200626A1 (en) * 1981-01-12 1982-12-23 Nissan Motor Co., Ltd., Yokohama, Kanagawa METHOD FOR CHECKING WHETHER A MEMORY IS INSERTED INTO A MICROCOMPUTER SYSTEM
JPS5829052A (en) * 1981-08-12 1983-02-21 Hitachi Ltd Microcomputer device with malfunction preventing function
JPS58115514A (en) * 1981-12-29 1983-07-09 Hitachi Ltd Connection detecting system
JPS58195916A (en) * 1982-05-11 1983-11-15 Mitsubishi Electric Corp Data transfer device
JPS5916001A (en) * 1982-07-20 1984-01-27 Oki Electric Ind Co Ltd Fail-safe method of on-vehicle computer
US4580212A (en) * 1981-03-23 1986-04-01 Nissan Motor Co., Ltd. Computer having correctable read only memory
JPS61177545A (en) * 1985-02-01 1986-08-09 Nec Corp Data processor with auxiliary processor
JPS61213929A (en) * 1985-03-19 1986-09-22 Nec Corp Data processing device with auxiliary processor
JPS6324331A (en) * 1986-03-31 1988-02-01 Toshiba Corp Runaway detecting device for computer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3200626A1 (en) * 1981-01-12 1982-12-23 Nissan Motor Co., Ltd., Yokohama, Kanagawa METHOD FOR CHECKING WHETHER A MEMORY IS INSERTED INTO A MICROCOMPUTER SYSTEM
US4488257A (en) * 1981-01-12 1984-12-11 Nissan Motor Company, Limited Method for confirming incorporation of a memory into microcomputer system
US4580212A (en) * 1981-03-23 1986-04-01 Nissan Motor Co., Ltd. Computer having correctable read only memory
JPS5829052A (en) * 1981-08-12 1983-02-21 Hitachi Ltd Microcomputer device with malfunction preventing function
JPS58115514A (en) * 1981-12-29 1983-07-09 Hitachi Ltd Connection detecting system
JPS58195916A (en) * 1982-05-11 1983-11-15 Mitsubishi Electric Corp Data transfer device
JPS5916001A (en) * 1982-07-20 1984-01-27 Oki Electric Ind Co Ltd Fail-safe method of on-vehicle computer
JPS61177545A (en) * 1985-02-01 1986-08-09 Nec Corp Data processor with auxiliary processor
JPS61213929A (en) * 1985-03-19 1986-09-22 Nec Corp Data processing device with auxiliary processor
JPS6324331A (en) * 1986-03-31 1988-02-01 Toshiba Corp Runaway detecting device for computer

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