JPS54139443A - Information processor - Google Patents
Information processorInfo
- 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
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
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)
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 |
-
1978
- 1978-04-21 JP JP4654278A patent/JPS54139443A/en active Pending
Cited By (10)
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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