JPS55166736A - Keyboard encoder - Google Patents
Keyboard encoderInfo
- Publication number
- JPS55166736A JPS55166736A JP7507679A JP7507679A JPS55166736A JP S55166736 A JPS55166736 A JP S55166736A JP 7507679 A JP7507679 A JP 7507679A JP 7507679 A JP7507679 A JP 7507679A JP S55166736 A JPS55166736 A JP S55166736A
- Authority
- JP
- Japan
- Prior art keywords
- key
- keyboard
- written
- considered
- generated
- 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.)
- Granted
Links
Landscapes
- Input From Keyboards Or The Like (AREA)
Abstract
PURPOSE: To attain secure operation by generating an output only when the result of a complete scan differs from the last one.
CONSTITUTION: Keyboard 1 has keys arranged in a matrix and they are scanned in sequence. The states of each contact, "1" and "0", are written in RAM10. With key K depressed, a signal of "0" is led from its contact and "1" is written at a corresponding address in RAM. At this time, when the state of the last scan is "0", key K is considered to have been pushed and a strobe signal is generated, but when "1", chattering or a slow key stroke is considered to have been made and no strobe signal is generated. This circuit suits to a keyboard using contactless elements such as Hall IC for keys K.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54075076A JPS5816489B2 (en) | 1979-06-14 | 1979-06-14 | keyboard encoder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54075076A JPS5816489B2 (en) | 1979-06-14 | 1979-06-14 | keyboard encoder |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55166736A true JPS55166736A (en) | 1980-12-26 |
JPS5816489B2 JPS5816489B2 (en) | 1983-03-31 |
Family
ID=13565723
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54075076A Expired JPS5816489B2 (en) | 1979-06-14 | 1979-06-14 | keyboard encoder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5816489B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2606527A1 (en) * | 1986-11-07 | 1988-05-13 | Solmer Ste Lorraine Merid Lami | Computer keyboards which can be adapted to the needs of the user and methods of manufacture |
CN109714865A (en) * | 2019-02-27 | 2019-05-03 | 东北林业大学 | A kind of LED drive circuit and method of no stroboscopic High Power Factor |
-
1979
- 1979-06-14 JP JP54075076A patent/JPS5816489B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2606527A1 (en) * | 1986-11-07 | 1988-05-13 | Solmer Ste Lorraine Merid Lami | Computer keyboards which can be adapted to the needs of the user and methods of manufacture |
CN109714865A (en) * | 2019-02-27 | 2019-05-03 | 东北林业大学 | A kind of LED drive circuit and method of no stroboscopic High Power Factor |
Also Published As
Publication number | Publication date |
---|---|
JPS5816489B2 (en) | 1983-03-31 |
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