JPS56110141A - Key input device - Google Patents
Key input deviceInfo
- Publication number
- JPS56110141A JPS56110141A JP1206880A JP1206880A JPS56110141A JP S56110141 A JPS56110141 A JP S56110141A JP 1206880 A JP1206880 A JP 1206880A JP 1206880 A JP1206880 A JP 1206880A JP S56110141 A JPS56110141 A JP S56110141A
- Authority
- JP
- Japan
- Prior art keywords
- key
- terminals
- become
- dphi
- 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
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Input From Keyboards Or The Like (AREA)
Abstract
PURPOSE:To remarkably decrease the number of input/output terminals of the IC required for the key detection work, by arranging 3 terminals to one key, and adopting the key constitution by which said 3 terminals all become the same potential by depressing the key. CONSTITUTION:The control circuit IC is provided with 3 strobe output terminals Dphi-D2, and the key input terminals Kphi-K2 and K3-K5 are provided, placing the terminals Dphi-D2 between them. The keys 0-44 which are used in this case have a contact D and two contacts K to one key, respectively, and are able to make three signal lines conduct at the same time by depressing the key. Now, when the key 44 is made to conduct, the IC starts scanning, and scans as to whether one of the termianls Kphi-K5 has become ''1'' by making the terminals Dphi-D2 ''1'' in order. Since the terminals D2, K2, K5 are conducting, however, when the terminal D2 has become 1, K2 and K5 become 1, and it is detected that the key 44 has been depressed. In this way, 45 keys can be detected by nine input/output terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1206880A JPS56110141A (en) | 1980-02-05 | 1980-02-05 | Key input device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1206880A JPS56110141A (en) | 1980-02-05 | 1980-02-05 | Key input device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56110141A true JPS56110141A (en) | 1981-09-01 |
Family
ID=11795279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1206880A Pending JPS56110141A (en) | 1980-02-05 | 1980-02-05 | Key input device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56110141A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59128718A (en) * | 1983-01-13 | 1984-07-24 | 株式会社東海理化電機製作所 | Matrix switch |
| JPS59169640U (en) * | 1983-04-28 | 1984-11-13 | カシオ計算機株式会社 | key input device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5093337A (en) * | 1973-12-19 | 1975-07-25 |
-
1980
- 1980-02-05 JP JP1206880A patent/JPS56110141A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5093337A (en) * | 1973-12-19 | 1975-07-25 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59128718A (en) * | 1983-01-13 | 1984-07-24 | 株式会社東海理化電機製作所 | Matrix switch |
| JPS59169640U (en) * | 1983-04-28 | 1984-11-13 | カシオ計算機株式会社 | key input device |
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