JPS6474601A - Electronic controller for automobile - Google Patents
Electronic controller for automobileInfo
- Publication number
- JPS6474601A JPS6474601A JP23114387A JP23114387A JPS6474601A JP S6474601 A JPS6474601 A JP S6474601A JP 23114387 A JP23114387 A JP 23114387A JP 23114387 A JP23114387 A JP 23114387A JP S6474601 A JPS6474601 A JP S6474601A
- Authority
- JP
- Japan
- Prior art keywords
- cpu
- halt signal
- inhibit
- written
- ram
- 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
Landscapes
- Safety Devices In Control Systems (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
PURPOSE:To surely prevent abnormal data from being written in a storage part by operating an inhibiting means consisting of hardware at the time of input of a halt signal to inhibit the access to the storage part from an operation processing part. CONSTITUTION:When an operating voltage VCC applied to a CPU 11 is dropped to a prescribed value or lower, an input/output device 12 outputs a halt signal to the CPU 11. When the halt signal is inputted from the device 12, the CPU 11 stops the operation processing of the controlled variable and opens a switch 15. Then, a data bus 14 is opened to inhibit the access from the CPU 11 to a RAM 13, and therefore, abnormal data is surely prevented from being written in the RAM 13 though the voltage VCC cannot detect the halt signal thereafter to cause the abnormal operation of the CPU 11.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23114387A JPS6474601A (en) | 1987-09-17 | 1987-09-17 | Electronic controller for automobile |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23114387A JPS6474601A (en) | 1987-09-17 | 1987-09-17 | Electronic controller for automobile |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6474601A true JPS6474601A (en) | 1989-03-20 |
Family
ID=16918962
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23114387A Pending JPS6474601A (en) | 1987-09-17 | 1987-09-17 | Electronic controller for automobile |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6474601A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0328044A (en) * | 1989-06-26 | 1991-02-06 | Zexel Corp | Monitoring device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61262803A (en) * | 1985-05-15 | 1986-11-20 | Nippon Denso Co Ltd | Electronic controller |
-
1987
- 1987-09-17 JP JP23114387A patent/JPS6474601A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61262803A (en) * | 1985-05-15 | 1986-11-20 | Nippon Denso Co Ltd | Electronic controller |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0328044A (en) * | 1989-06-26 | 1991-02-06 | Zexel Corp | Monitoring device |
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