JPS5688529A - Key input control system - Google Patents
Key input control systemInfo
- Publication number
- JPS5688529A JPS5688529A JP16555679A JP16555679A JPS5688529A JP S5688529 A JPS5688529 A JP S5688529A JP 16555679 A JP16555679 A JP 16555679A JP 16555679 A JP16555679 A JP 16555679A JP S5688529 A JPS5688529 A JP S5688529A
- Authority
- JP
- Japan
- Prior art keywords
- time
- bounce
- key
- input
- key input
- 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
- Input From Keyboards Or The Like (AREA)
Abstract
PURPOSE: To improve the operativity of a key input device with conductive rubber contacts, metallic contacts, or the like that provides fast, light key touch input, by detecting and judging a make shorter than a monitor time as a bounce.
CONSTITUTION: During a key read, input key discriminating circuit 23 reads a key signal by timer 29 at any time; when a key signal is turned off owing to a bounce, the off time is counted by monitoring circuit 28, which when the count value is less than a certain value, judges that as a bounce. On the other hand, when the off-time is longer than a certain time, that is considered to be caused by the key input. Since the normal bounce time is 10W20ms and the time interval of the repetitive depression of keys is about 100ms, they can be distinguished. For this purpose, the ≤30ms off-time is set as a bounce to monitoring circuit 28, so that an influence of the bounce can be eliminated.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16555679A JPS5688529A (en) | 1979-12-21 | 1979-12-21 | Key input control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16555679A JPS5688529A (en) | 1979-12-21 | 1979-12-21 | Key input control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5688529A true JPS5688529A (en) | 1981-07-18 |
Family
ID=15814601
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16555679A Pending JPS5688529A (en) | 1979-12-21 | 1979-12-21 | Key input control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5688529A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5860340A (en) * | 1981-10-06 | 1983-04-09 | Brother Ind Ltd | Keyboard controlling device |
CN111949137A (en) * | 2019-05-17 | 2020-11-17 | 凯杰益欧洲有限公司 | Switch device with bounce noise suppression function and method for suppressing bounce noise |
-
1979
- 1979-12-21 JP JP16555679A patent/JPS5688529A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5860340A (en) * | 1981-10-06 | 1983-04-09 | Brother Ind Ltd | Keyboard controlling device |
CN111949137A (en) * | 2019-05-17 | 2020-11-17 | 凯杰益欧洲有限公司 | Switch device with bounce noise suppression function and method for suppressing bounce noise |
CN111949137B (en) * | 2019-05-17 | 2024-05-07 | 美商沃耶特拉海龟滩有限公司 | Switch device with bounce noise suppression function and method for suppressing bounce noise |
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