JPH022767U - - Google Patents
Info
- Publication number
- JPH022767U JPH022767U JP7986388U JP7986388U JPH022767U JP H022767 U JPH022767 U JP H022767U JP 7986388 U JP7986388 U JP 7986388U JP 7986388 U JP7986388 U JP 7986388U JP H022767 U JPH022767 U JP H022767U
- Authority
- JP
- Japan
- Prior art keywords
- external device
- selection input
- port
- input port
- connection 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
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Microcomputers (AREA)
Description
第１図は本考案の一実施例によるマイコンの外
部機器接続回路図、第２図は同外部機器（スイツ
チ）の説明図、第３図は従来の同回路図である。
１……マイコン、２……選択入力ポート、３…
…接続ポート、４……外部機器（スイツチ）。
FIG. 1 is a circuit diagram for connecting a microcomputer to an external device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the external device (switch), and FIG. 3 is a conventional circuit diagram. 1...Microcomputer, 2...Selection input port, 3...
...Connection port, 4...External device (switch).
Claims (1)
仕様Ｂで機能する外部機器４の接続ポート３とを
もつマイコン１の外部機器接続回路において、選
択入力ポート２と接続ポート３とを外部機器４を
介して接続し、外部機器４にはそれを接続した場
合仕様Ｂを選択させ、それを接続しなかつた場合
仕様Ａを選択させる機能をもたせたことを特徴と
するマイコンの外部機器接続回路。 (2) 外部機器４をスイツチで構成し、それを接
続した場合選択入力ポート２にＬ信号を入力して
仕様Ｂを選択させ、又それを接続しなかつた場合
選択入力ポート２にＨ信号を入力して仕様Ａを選
択させることを特徴とする実用新案登録請求の範
囲第１項記載のマイコンの外部機器接続回路。 (3) 選択入力ポート２と接続ポート３とに電源
を接続し、選択入力ポート２側のスイツチの端子
をアースすることを特徴とする実用新案登録請求
の範囲第２項記載のマイコンの外部機器接続回路
。[Scope of Claim for Utility Model Registration] (1) In the external device connection circuit of the microcomputer 1 that has specifications A and B, their selection input ports 2, and a connection port 3 for an external device 4 that functions according to specification B, the selection input port 2 and the connection port 3 are connected via the external device 4, and the external device 4 has a function that selects specification B when it is connected, and selects specification A when it is not connected. Features a microcontroller external device connection circuit. (2) External device 4 is configured with a switch, and if it is connected, input an L signal to selection input port 2 to select specification B, and if it is not connected, input an H signal to selection input port 2. The external device connection circuit for a microcomputer according to claim 1, wherein specification A is selected by inputting an input. (3) The external device for the microcomputer according to claim 2 of the utility model registration claim, characterized in that a power source is connected to the selection input port 2 and the connection port 3, and the terminal of the switch on the selection input port 2 side is grounded. connection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7986388U JPH022767U (en) | 1988-06-16 | 1988-06-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7986388U JPH022767U (en) | 1988-06-16 | 1988-06-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH022767U true JPH022767U (en) | 1990-01-10 |
Family
ID=31304710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7986388U Pending JPH022767U (en) | 1988-06-16 | 1988-06-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH022767U (en) |
-
1988
- 1988-06-16 JP JP7986388U patent/JPH022767U/ja active Pending