JPS6413541U - - Google Patents
Info
- Publication number
- JPS6413541U JPS6413541U JP10697087U JP10697087U JPS6413541U JP S6413541 U JPS6413541 U JP S6413541U JP 10697087 U JP10697087 U JP 10697087U JP 10697087 U JP10697087 U JP 10697087U JP S6413541 U JPS6413541 U JP S6413541U
- Authority
- JP
- Japan
- Prior art keywords
- counter
- keyboard
- control circuit
- value
- counts
- 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
- 238000010586 diagram Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 1
Description
第１図は本考案の一実施例を示すブロツク図、
第２図は本考案実施例の動作を示すフローチヤー
ト、第３図、第４図はキーボードのキーマトリツ
クスを示す図である。
１……キーボード、２……制御回路、２ａ……
制御部、２ｂ……カウンタ、３……ＣＰＵ。
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a flowchart showing the operation of the embodiment of the present invention, and FIGS. 3 and 4 are diagrams showing the key matrix of the keyboard. 1...Keyboard, 2...Control circuit, 2a...
Control unit, 2b...Counter, 3...CPU.
Claims (1)
を介さずに行われるキーボードの制御回路におい
て、押下されているキーの総数を数えるカウンタ
と、このカウンタの値が３以下の場合、通常のキ
ー処理を行い、カウンタの値が４以上の場合、キ
ー入力を無効とする制御部とを具備することを特
徴とするキーボード制御回路。 In the control circuit of a keyboard where the contact between the row line and the column line is made without a diode, there is a counter that counts the total number of pressed keys, and if the value of this counter is 3 or less, normal key processing is performed, A keyboard control circuit comprising: a control section that disables key input when the value of the counter is 4 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10697087U JPS6413541U (en) | 1987-07-14 | 1987-07-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10697087U JPS6413541U (en) | 1987-07-14 | 1987-07-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6413541U true JPS6413541U (en) | 1989-01-24 |
Family
ID=31340955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10697087U Pending JPS6413541U (en) | 1987-07-14 | 1987-07-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6413541U (en) |
-
1987
- 1987-07-14 JP JP10697087U patent/JPS6413541U/ja active Pending