JPH02113445U - - Google Patents
Info
- Publication number
- JPH02113445U JPH02113445U JP2263589U JP2263589U JPH02113445U JP H02113445 U JPH02113445 U JP H02113445U JP 2263589 U JP2263589 U JP 2263589U JP 2263589 U JP2263589 U JP 2263589U JP H02113445 U JPH02113445 U JP H02113445U
- Authority
- JP
- Japan
- Prior art keywords
- key
- matrix
- matrix units
- switches
- identifying
- 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
- 239000011159 matrix material Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Input From Keyboards Or The Like (AREA)
Description
第１図は本考案の一実施例を示す回路構成図、
第２図は同実施例に用いられるキー入力セレクタ
を示す回路構成図、第３図は同実施例の動作を説
明するためのタイムチヤート、第４図は同実施例
に用いられるノア回路の動作状態を説明するため
の図、第５図は本考案の他実施例を示す回路構成
図、第６図および第７図はそれぞれ従来のキー入
力回路を示す回路構成図である。
１，２……キーマトリクス部、１１，２１……
キースイツチ、３……キー入力セレクタ、３１，
３２，３４……ノア回路、３３……プリアツプ抵
抗。
FIG. 1 is a circuit diagram showing an embodiment of the present invention;
Fig. 2 is a circuit configuration diagram showing the key input selector used in the same embodiment, Fig. 3 is a time chart for explaining the operation of the same embodiment, and Fig. 4 is the operation of the NOR circuit used in the same embodiment. FIG. 5 is a circuit configuration diagram showing another embodiment of the present invention, and FIGS. 6 and 7 are circuit configuration diagrams each showing a conventional key input circuit. 1, 2...Key matrix section, 11, 21...
Key switch, 3...Key input selector, 31,
32, 34...NOR circuit, 33...Pre-up resistor.
Claims (1)
る少なくとも２組のキーマトリクス部と、上記キ
ースイツチの操作に応じて上記キーマトリクス部
毎に異なるレベルの信号を発生する信号発生手段
と、この信号発生手段からの信号レベルを検出し
て操作されたキースイツチを特定するキー検知手
段とを具備したことを特徴とするキー入力回路。 at least two sets of key matrix units having key switches arranged in a matrix; signal generating means for generating signals of different levels for each of the key matrix units according to the operation of the key switches; A key input circuit comprising key detection means for detecting a signal level and identifying an operated key switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263589U JPH02113445U (en) | 1989-02-28 | 1989-02-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263589U JPH02113445U (en) | 1989-02-28 | 1989-02-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02113445U true JPH02113445U (en) | 1990-09-11 |
Family
ID=31240923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2263589U Pending JPH02113445U (en) | 1989-02-28 | 1989-02-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02113445U (en) |
-
1989
- 1989-02-28 JP JP2263589U patent/JPH02113445U/ja active Pending
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