JPH0466846U - - Google Patents
Info
- Publication number
- JPH0466846U JPH0466846U JP10943790U JP10943790U JPH0466846U JP H0466846 U JPH0466846 U JP H0466846U JP 10943790 U JP10943790 U JP 10943790U JP 10943790 U JP10943790 U JP 10943790U JP H0466846 U JPH0466846 U JP H0466846U
- Authority
- JP
- Japan
- Prior art keywords
- key
- circuit
- input
- telephone
- switching 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.)
- Granted
Links
- 239000011159 matrix material Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Telephone Set Structure (AREA)
Description
第１図は本考案の実施例を示すブロツク図、第
２図及び第３図は第１図に示された回路を有する
電話機用ＩＣの使用例を示す図である。
１……キースキヤン入力回路、２……電話機能
回路、３……データバス、４……インターフエイ
ス回路、５，６，７……切り替え回路、８……シ
フトレジスタ、９……ラツチ回路。
FIG. 1 is a block diagram showing an embodiment of the present invention, and FIGS. 2 and 3 are diagrams showing an example of use of a telephone IC having the circuit shown in FIG. 1. 1... Key scan input circuit, 2... Telephone function circuit, 3... Data bus, 4... Interface circuit, 5, 6, 7... Switching circuit, 8... Shift register, 9... Latch circuit.
Claims (1)
スキヤンすることにより操作されたキーのキーコ
ードを出力するキースキヤン入力回路と、 前記キースキヤン入力回路によつて出力された
キーコードが指示する動作を行う電話機能回路を
備えた電話機用ＩＣのキー入力切り替え回路であ
つて、 外部制御機器から任意のデータを受け取るため
のインターフエイス回路と、 前記キースキヤン入力回路にキー入力信号を印
加するための任意の信号線と前記インターフエイ
スに外部から印加する信号線を選択的に外部端子
に接続する切り替え回路と、 該切り替え回路の切り替えを制御するための信
号が印加される外部端子と、 を備えたことを特徴とする電話機用ＩＣのキー入
力切り替え回路。[Claims for Utility Model Registration] A key scan input circuit that outputs a key code of an operated key by key scanning key switches arranged in a matrix, and a key code outputted by the key scan input circuit indicates an instruction. A key input switching circuit for a telephone IC equipped with an operational telephone function circuit, comprising: an interface circuit for receiving arbitrary data from an external control device; and an interface circuit for applying a key input signal to the key scan input circuit. A switching circuit selectively connects an arbitrary signal line and a signal line applied to the interface from the outside to an external terminal, and an external terminal to which a signal for controlling switching of the switching circuit is applied. A key input switching circuit for a telephone IC, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10943790U JP2523190Y2 (en) | 1990-10-18 | 1990-10-18 | Key input switching circuit for telephone IC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10943790U JP2523190Y2 (en) | 1990-10-18 | 1990-10-18 | Key input switching circuit for telephone IC |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0466846U true JPH0466846U (en) | 1992-06-12 |
| JP2523190Y2 JP2523190Y2 (en) | 1997-01-22 |
Family
ID=31856641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10943790U Expired - Lifetime JP2523190Y2 (en) | 1990-10-18 | 1990-10-18 | Key input switching circuit for telephone IC |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2523190Y2 (en) |
-
1990
- 1990-10-18 JP JP10943790U patent/JP2523190Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2523190Y2 (en) | 1997-01-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |