JPS62171221U

JPS62171221U -

Info

Publication number: JPS62171221U
Application number: JP5856386U
Authority: JP
Priority date: 1986-04-18
Filing date: 1986-04-18
Publication date: 1987-10-30

Description

[Brief explanation of the drawing]

第１図は本考案のフアンクシヨン切換回路の駆
動回路の一実施例を示す回路図、第２図は従来の
フアンクシヨン切換回路の駆動回路、第３図は第
２図のスイツチをトランジスタに置換した場合の
部分回路図、第４図は第１図のフアンクシヨン切
換回路の一部を示すブロツク系統図、第５図は第
１のポート７〜１２の信号のタイムチヤートであ
る。１〜５……入出力兼用の端子、６……正の電源
供給端子、７〜１２……ポート、Ｌ_１〜Ｌ_５……
発光ダイオード、Ｎ_１……フアンクシヨン切換回
路、Ｎ_２……マイクロコンピユータ（制御回路）
、Ｒ_０……共通の抵抗器、Ｒ_６〜Ｒ_１０……抵抗
器、Ｒ_１〜Ｒ_５……高抵抗直の低抗器、Ｑ_１〜Ｑ
_５……スイツチング素子。 Fig. 1 is a circuit diagram showing an embodiment of the drive circuit of the function switching circuit of the present invention, Fig. 2 is a drive circuit of a conventional function switching circuit, and Fig. 3 is a case where the switch in Fig. 2 is replaced with a transistor. 4 is a block system diagram showing a part of the function switching circuit of FIG. 1, and FIG. 5 is a time chart of signals at the first ports 7 to 12. 1 to 5...terminals for both input and output, 6...positive power supply terminals, 7 to 12...ports, _L1 to _L5 ...
Light emitting diode, _N1 ...Function switching circuit, _N2 ...Microcomputer (control circuit)
, R ₀ ... Common resistor, R ₆ - R ₁₀ ... Resistor, R ₁ - _{R 5} ... Low resistance resistor directly connected to high resistance, Q ₁ - Q
₅ ...Switching element.

Claims

[Scope of utility model registration request]

When a signal of a predetermined level is supplied, a plurality of A drive circuit for a function switching circuit having terminals used for both input and output, wherein each of the plurality of terminals used for both input and output is a resistor having a high resistance value, the other end of which is connected to a power supply terminal. One end of
A drive circuit for a function switching circuit in which each cathode or anode of a light emitting diode is connected to a switching element, each anode or cathode being connected to a power supply terminal via a common resistor.