JPS57195396A - Data storage control system - Google Patents
Data storage control systemInfo
- Publication number
- JPS57195396A JPS57195396A JP56079554A JP7955481A JPS57195396A JP S57195396 A JPS57195396 A JP S57195396A JP 56079554 A JP56079554 A JP 56079554A JP 7955481 A JP7955481 A JP 7955481A JP S57195396 A JPS57195396 A JP S57195396A
- Authority
- JP
- Japan
- Prior art keywords
- data
- storage area
- flag
- storage
- channel
- 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
- Power Sources (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Abstract
PURPOSE: To read correct data out of storage parts after a main power source is recovered, by providing a couple of data storage areas and a flag area which can be changed in state every time storing operation ends.
CONSTITUTION: In the data storage area A of the channel CH1 of an RAM12, last frequency data is sotred and in the storage area B, up-to-date frequency data is stored; when the flag in a flag area F1 is set to 1, varied frequency data transferred to this channel is stored in the storage area A. If a main power source becomes abnormal during the storage of said data, incomplete data remains in the storage area A. Since said flag is still set to 1, the data in the storage area B is read out as effective data when frequency data is read out from this channel CH1 after the main power source recovers.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56079554A JPS57195396A (en) | 1981-05-26 | 1981-05-26 | Data storage control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56079554A JPS57195396A (en) | 1981-05-26 | 1981-05-26 | Data storage control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57195396A true JPS57195396A (en) | 1982-12-01 |
Family
ID=13693222
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56079554A Pending JPS57195396A (en) | 1981-05-26 | 1981-05-26 | Data storage control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57195396A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62107329A (en) * | 1985-11-05 | 1987-05-18 | Toshiba Corp | Document generating device |
JPH0573431A (en) * | 1991-09-17 | 1993-03-26 | Nec Ic Microcomput Syst Ltd | Storage circuit |
US5668726A (en) * | 1993-12-17 | 1997-09-16 | Nippondenso Co, Ltd. | Data backup apparatus utilized in an electronic control system and data backup method performed in the data backup apparatus |
-
1981
- 1981-05-26 JP JP56079554A patent/JPS57195396A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62107329A (en) * | 1985-11-05 | 1987-05-18 | Toshiba Corp | Document generating device |
JPH0573431A (en) * | 1991-09-17 | 1993-03-26 | Nec Ic Microcomput Syst Ltd | Storage circuit |
US5668726A (en) * | 1993-12-17 | 1997-09-16 | Nippondenso Co, Ltd. | Data backup apparatus utilized in an electronic control system and data backup method performed in the data backup apparatus |
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