JPS6481057A - Memory device - Google Patents
Memory deviceInfo
- Publication number
- JPS6481057A JPS6481057A JP23745687A JP23745687A JPS6481057A JP S6481057 A JPS6481057 A JP S6481057A JP 23745687 A JP23745687 A JP 23745687A JP 23745687 A JP23745687 A JP 23745687A JP S6481057 A JPS6481057 A JP S6481057A
- Authority
- JP
- Japan
- Prior art keywords
- pseudo
- runaway
- cpu
- transmitted via
- microcomputer
- 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
- Storage Device Security (AREA)
Abstract
PURPOSE:To ensure the sure protection of important data despite the runaway of a microcomputer by using a means which delivers a write permission signal only when a specific address designated by a control part is normal. CONSTITUTION:When a microcomputer CPU 1 has runaway, the pseudo data information is transmitted via a data bus 11. At the same time, the pseudo address information is transmitted via an address bus 13 together with a pseudo write signal caused by the noises, etc. However no command is produced for output of a trigger signal to a monostable multivibrator 9 from the CPU 1 due to the runaway of the CPU 1. Thus an OR circuit 7 can inhibit the transmission of the pseudo write signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23745687A JPS6481057A (en) | 1987-09-24 | 1987-09-24 | Memory device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23745687A JPS6481057A (en) | 1987-09-24 | 1987-09-24 | Memory device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6481057A true JPS6481057A (en) | 1989-03-27 |
Family
ID=17015612
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23745687A Pending JPS6481057A (en) | 1987-09-24 | 1987-09-24 | Memory device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6481057A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01180054A (en) * | 1988-01-11 | 1989-07-18 | Nec Corp | Memory contents protecting circuit |
-
1987
- 1987-09-24 JP JP23745687A patent/JPS6481057A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01180054A (en) * | 1988-01-11 | 1989-07-18 | Nec Corp | Memory contents protecting circuit |
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