JPS6429955U - - Google Patents
Info
- Publication number
- JPS6429955U JPS6429955U JP12407187U JP12407187U JPS6429955U JP S6429955 U JPS6429955 U JP S6429955U JP 12407187 U JP12407187 U JP 12407187U JP 12407187 U JP12407187 U JP 12407187U JP S6429955 U JPS6429955 U JP S6429955U
- Authority
- JP
- Japan
- Prior art keywords
- control line
- keys
- key
- control
- detection circuit
- 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
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は本考案の実施例の回路図、第２図は従
来例の回路図、第３図はキー操作によつて制御線
に接続されるキー抵抗値と信号電圧の関係を示す
特性図である。
（主な記号）、１０１，１０２，１０３…キー
、２０１，２０２，２０３，６…抵抗、３，４…
制御線、８…マイクロプロセツサユニツト（ＭＰ
Ｕ）、９…Ａ／Ｄ変換器。
Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a circuit diagram of a conventional example, and Fig. 3 is a characteristic diagram showing the relationship between the key resistance value connected to the control line by key operation and the signal voltage. It is. (Main symbols), 101, 102, 103...key, 201, 202, 203, 6...resistance, 3, 4...
Control line, 8...Microprocessor unit (MP
U), 9...A/D converter.
Claims (1)
数のキーの操作情報を同一の制御線を介して制御
部に入力し、制御部で上記キーの操作を識別する
ようにした操作キー検出回路に於いて、上記複数
のキーは互に異なつた値の抵抗を介して上記制御
線に並列に接続されており、上記制御部の処理ユ
ニツトのデータ入力端子と上記制御線との間には
、上記キーの操作により上記制御線に結合される
抵抗の値で決定される信号電圧をデイジタル符号
に変換するＡ／Ｄ変換器が設けられている電話装
置の操作キー検出回路。 The telephone is equipped with a plurality of keys, and the operation key detection circuit inputs the operation information of the plurality of keys to the control unit via the same control line, and the control unit identifies the operation of the key. The plurality of keys are connected in parallel to the control line through resistors of different values, and the control line is connected between the data input terminal of the processing unit of the control section and the control line. An operation key detection circuit for a telephone device, which is provided with an A/D converter that converts a signal voltage determined by the value of a resistor coupled to the control line into a digital code when a key is operated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12407187U JPS6429955U (en) | 1987-08-13 | 1987-08-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12407187U JPS6429955U (en) | 1987-08-13 | 1987-08-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6429955U true JPS6429955U (en) | 1989-02-22 |
Family
ID=31373486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12407187U Pending JPS6429955U (en) | 1987-08-13 | 1987-08-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6429955U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02300690A (en) * | 1989-05-16 | 1990-12-12 | Japan Radio Co Ltd | Rainfall and snowfall measuring instrument |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52138836A (en) * | 1976-05-15 | 1977-11-19 | Kawai Musical Instr Mfg Co | Digital key signal generator |
| JPS6146624B2 (en) * | 1980-03-31 | 1986-10-15 | Misawa Homes Res Inst |
-
1987
- 1987-08-13 JP JP12407187U patent/JPS6429955U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52138836A (en) * | 1976-05-15 | 1977-11-19 | Kawai Musical Instr Mfg Co | Digital key signal generator |
| JPS6146624B2 (en) * | 1980-03-31 | 1986-10-15 | Misawa Homes Res Inst |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02300690A (en) * | 1989-05-16 | 1990-12-12 | Japan Radio Co Ltd | Rainfall and snowfall measuring instrument |
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