JPS559220A - Keyboard system - Google Patents
Keyboard systemInfo
- Publication number
- JPS559220A JPS559220A JP8006378A JP8006378A JPS559220A JP S559220 A JPS559220 A JP S559220A JP 8006378 A JP8006378 A JP 8006378A JP 8006378 A JP8006378 A JP 8006378A JP S559220 A JPS559220 A JP S559220A
- Authority
- JP
- Japan
- Prior art keywords
- potential
- wires
- read
- detected
- negative potential
- 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 obtain efficient keyboard system, by using the keyboard and the microcomputer.
CONSTITUTION: The microcomputer 2 makes all the output transversal wires to negative potential, sequentially reads in the potential for input longitudinal wires floating in another potential via the resistors Ro to R11 by N wires, and read-in is continued when other potentials are detected, and the read-in is stopped when negative potential is detected and the timer is started. After a given time, the potential for transversal wire group is read in after a given time. When negative potential is detected again, the presence of key is discriminated, the output transversal wires are sequentially into negative potential one by one with the computer 2, the potential of the full input longitudinal wires is sequentially read in by N wires on each occasion and the potential is written RAM. When negative potential is detected on the input longitudinal wires, the depression key is determined from the output transversal wire number and the potential data of the full input longitudinal wires, the code corresponding to each key obtains the depression code from the memory memorized, to perform output on the bus line 3.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8006378A JPS559220A (en) | 1978-06-30 | 1978-06-30 | Keyboard system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8006378A JPS559220A (en) | 1978-06-30 | 1978-06-30 | Keyboard system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS559220A true JPS559220A (en) | 1980-01-23 |
Family
ID=13707766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8006378A Pending JPS559220A (en) | 1978-06-30 | 1978-06-30 | Keyboard system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS559220A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5771038A (en) * | 1980-10-22 | 1982-05-01 | Nec Home Electronics Ltd | Key switch scanning system |
| JPS57174731A (en) * | 1981-04-20 | 1982-10-27 | Matsushita Electric Ind Co Ltd | Controller of audio device and the like |
| JPS5885220U (en) * | 1981-11-30 | 1983-06-09 | 株式会社田村電機製作所 | data reading circuit |
| JPS6034250U (en) * | 1983-08-13 | 1985-03-08 | 松下電工株式会社 | kitchen unit |
| JPS643721A (en) * | 1987-06-25 | 1989-01-09 | Silver Seiko | Key input device |
| JPS6478316A (en) * | 1988-08-20 | 1989-03-23 | Brother Ind Ltd | Electronic controller capable of repeating action |
| JPH02289241A (en) * | 1989-02-24 | 1990-11-29 | Abiomed Inc | Stapler for surgery |
-
1978
- 1978-06-30 JP JP8006378A patent/JPS559220A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5771038A (en) * | 1980-10-22 | 1982-05-01 | Nec Home Electronics Ltd | Key switch scanning system |
| JPS57174731A (en) * | 1981-04-20 | 1982-10-27 | Matsushita Electric Ind Co Ltd | Controller of audio device and the like |
| JPS5885220U (en) * | 1981-11-30 | 1983-06-09 | 株式会社田村電機製作所 | data reading circuit |
| JPS6034250U (en) * | 1983-08-13 | 1985-03-08 | 松下電工株式会社 | kitchen unit |
| JPS6211476Y2 (en) * | 1983-08-13 | 1987-03-18 | ||
| JPS643721A (en) * | 1987-06-25 | 1989-01-09 | Silver Seiko | Key input device |
| JPS6478316A (en) * | 1988-08-20 | 1989-03-23 | Brother Ind Ltd | Electronic controller capable of repeating action |
| JPH02289241A (en) * | 1989-02-24 | 1990-11-29 | Abiomed Inc | Stapler for surgery |
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