JPH0246441U - - Google Patents
Info
- Publication number
- JPH0246441U JPH0246441U JP12491188U JP12491188U JPH0246441U JP H0246441 U JPH0246441 U JP H0246441U JP 12491188 U JP12491188 U JP 12491188U JP 12491188 U JP12491188 U JP 12491188U JP H0246441 U JPH0246441 U JP H0246441U
- Authority
- JP
- Japan
- Prior art keywords
- key
- signal
- display
- electronic device
- small electronic
- 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 description 4
- 238000005070 sampling Methods 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 4
- 238000013500 data storage Methods 0.000 description 1
Landscapes
- Calculators And Similar Devices (AREA)
- Input From Keyboards Or The Like (AREA)
Description
第１図はこの考案を適用した小型電子機器の回
路構成を示すブロツク図、第２図は従来の小型電
子機器における表示セグメント信号およびキー信
号の波形を示す図、第３図は第１図の一部を詳細
に示す回路図、第４図は第３図における各部の出
力信号の波形を示す図である。
１…ＣＰＵ、２…制御部、３…表示データ記憶
部、４…セグメントドライバ、５…表示部、６…
コモンドライバ、７…キースイツチ、７ａ…コモ
ン信号ライン、７ｂ…キー出力ライン、７ｃ…キ
ー接点、８…表示コモンカウンタ、９…キー入力
検出部、９ａ…キー検出回路。
Fig. 1 is a block diagram showing the circuit configuration of a small electronic device to which this invention is applied, Fig. 2 is a diagram showing the waveforms of display segment signals and key signals in a conventional small electronic device, and Fig. 3 is the same as that of Fig. FIG. 4 is a circuit diagram showing a part of the circuit in detail, and FIG. 4 is a diagram showing waveforms of output signals of each part in FIG. 3. DESCRIPTION OF SYMBOLS 1...CPU, 2...Control unit, 3...Display data storage unit, 4...Segment driver, 5...Display unit, 6...
Common driver, 7... Key switch, 7a... Common signal line, 7b... Key output line, 7c... Key contact, 8... Display common counter, 9... Key input detection section, 9a... Key detection circuit.
Claims (1)
の表示信号を発生する信号発生手段とを備えた小
型電子機器であつて、 上記表示信号をキーサンプリング信号として出
力するキーサンプリング手段と、 上記キーサンプリング信号に対し開閉動作を行
いキー入力信号を得るためのキースイツチと、 このキースイツチを介して入力される上記キー
サンプリング信号の特定電圧レベルを検出する検
出回路と、 この検出回路の検出信号に基づきキー入力を判
断する判断手段 を具備したことを特徴とする小型電子機器。[Claims for Utility Model Registration] A small electronic device comprising a display device and signal generating means for generating a display signal for driving the display device, the device outputting the display signal as a key sampling signal. a key sampling means; a key switch for performing an opening/closing operation in response to the key sampling signal to obtain a key input signal; a detection circuit for detecting a specific voltage level of the key sampling signal input via the key switch; A small electronic device characterized by being equipped with a judgment means for judging key input based on a detection signal of a circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12491188U JPH0246441U (en) | 1988-09-24 | 1988-09-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12491188U JPH0246441U (en) | 1988-09-24 | 1988-09-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0246441U true JPH0246441U (en) | 1990-03-29 |
Family
ID=31375050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12491188U Pending JPH0246441U (en) | 1988-09-24 | 1988-09-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0246441U (en) |
-
1988
- 1988-09-24 JP JP12491188U patent/JPH0246441U/ja active Pending
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