JPS61196332U - - Google Patents
Info
- Publication number
- JPS61196332U JPS61196332U JP7452885U JP7452885U JPS61196332U JP S61196332 U JPS61196332 U JP S61196332U JP 7452885 U JP7452885 U JP 7452885U JP 7452885 U JP7452885 U JP 7452885U JP S61196332 U JPS61196332 U JP S61196332U
- Authority
- JP
- Japan
- Prior art keywords
- input
- output
- mode
- terminals
- switched
- 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
Landscapes
- Input From Keyboards Or The Like (AREA)
Description
第１図は本考案によるキイー入力回路の一実施
例を示す回路図、第２図はそのマイコン内の要部
の構成を簡略化して示す回路図、第３図は上記実
施例の動作タイムチヤートである。
１……マイコン、Ｐ０〜Ｐ４……入出力兼用端
子、Ｋ１〜Ｋ２０……キイースイツチ。
Fig. 1 is a circuit diagram showing an embodiment of the key input circuit according to the present invention, Fig. 2 is a circuit diagram showing a simplified configuration of the main parts in the microcomputer, and Fig. 3 is an operation time chart of the above embodiment. It is. 1...Microcomputer, P0 to P4 ...Input/output terminals, K1 to K20 ...Key switch.
Claims (1)
入出力兼用端子を備えるマイコンを使用し、その
ｎ個の端子のうち各１個と残りの（ｎ―１）との
間にそれぞれ１個づつキイースイツチを接続する
と共に、前記ｎ個の端子、入力モードの状態から
一定出力を導出する出力モードの状態に１個づつ
選択的に切換えて行き、その出力モードに切換ら
れた端子から上記出力が投入されたキイースイツ
チを介して入力モードの端子に印加されるように
してなるキイー入力回路。 A microcomputer with n input/output terminals that can be switched between input mode and output mode is used, and one terminal is placed between each one of the n terminals and the remaining (n-1). While connecting the key switch, the n terminals are selectively switched one by one from the input mode state to the output mode state that derives a constant output, and the above output is input from the terminal switched to the output mode. The key input circuit is configured such that the voltage is applied to the input mode terminal via the key switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7452885U JPS61196332U (en) | 1985-05-20 | 1985-05-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7452885U JPS61196332U (en) | 1985-05-20 | 1985-05-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61196332U true JPS61196332U (en) | 1986-12-08 |
Family
ID=30614914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7452885U Pending JPS61196332U (en) | 1985-05-20 | 1985-05-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61196332U (en) |
-
1985
- 1985-05-20 JP JP7452885U patent/JPS61196332U/ja active Pending
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