JPS6074342U - Pull-up resistor control circuit in key input section - Google Patents

Pull-up resistor control circuit in key input section

Info

Publication number
JPS6074342U
JPS6074342U JP16575483U JP16575483U JPS6074342U JP S6074342 U JPS6074342 U JP S6074342U JP 16575483 U JP16575483 U JP 16575483U JP 16575483 U JP16575483 U JP 16575483U JP S6074342 U JPS6074342 U JP S6074342U
Authority
JP
Japan
Prior art keywords
key input
pull
control circuit
input section
resistor control
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
Application number
JP16575483U
Other languages
Japanese (ja)
Inventor
祐幸 加藤
Original Assignee
カシオ計算機株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by カシオ計算機株式会社 filed Critical カシオ計算機株式会社
Priority to JP16575483U priority Critical patent/JPS6074342U/en
Publication of JPS6074342U publication Critical patent/JPS6074342U/en
Pending legal-status Critical Current

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  • Power Sources (AREA)
  • Electronic Switches (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来のキー人力部を示す回路構成図、第２図は
本考案の一実施例を示す回路構成図、第３図は同実施例
の動作を説明するためのタイミングチャートである。 ２１・・・・・・入力回路、２２・・・・・・キー、２
３，２４．２８，２９・・・・・・ＭＯＳ）ランジスタ
、２５・・・・・・フリップフロップ、２７・・・・・
・プルアップ抵抗。FIG. 1 is a circuit configuration diagram showing a conventional key input unit, FIG. 2 is a circuit configuration diagram showing an embodiment of the present invention, and FIG. 3 is a timing chart for explaining the operation of the same embodiment. 21...Input circuit, 22...Key, 2
3,24.28,29...MOS) transistor, 25...flip-flop, 27...
・Pull-up resistor.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] キーの非操作時におけるキー入力端子を所定電圧値に保
持するプルアップ抵抗と、このプルアップ抵抗と上記キ
ー入力端子との間に設けられたスイッチング素子と、常
時は上記スイッチング素子をオン状態に保持し、上記キ
ー入力端子にキー人力信号が与えられた場合、上記スイ
ッチング素子をオフする手段とを具備したことを特徴と
するキー人力部におけるプルアップ抵抗制御回路。A pull-up resistor holds the key input terminal at a predetermined voltage value when the key is not operated, a switching element is provided between the pull-up resistor and the key input terminal, and the switching element is normally turned on. A pull-up resistor control circuit in a key input section, comprising means for holding the switching element and turning off the switching element when a key input signal is applied to the key input terminal.
JP16575483U 1983-10-26 1983-10-26 Pull-up resistor control circuit in key input section Pending JPS6074342U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16575483U JPS6074342U (en) 1983-10-26 1983-10-26 Pull-up resistor control circuit in key input section

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16575483U JPS6074342U (en) 1983-10-26 1983-10-26 Pull-up resistor control circuit in key input section

Publications (1)

Publication Number Publication Date
JPS6074342U true JPS6074342U (en) 1985-05-24

Family

ID=30363060

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16575483U Pending JPS6074342U (en) 1983-10-26 1983-10-26 Pull-up resistor control circuit in key input section

Country Status (1)

Country Link
JP (1) JPS6074342U (en)

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