JPS6021123U

JPS6021123U - Keyboard interface circuit

Info

Publication number: JPS6021123U
Application number: JP11332883U
Authority: JP
Inventors: 香川　好正
Original assignee: フアナツク株式会社
Priority date: 1983-07-20
Filing date: 1983-07-20
Publication date: 1985-02-14

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

[Brief explanation of the drawing]

第１図は１個のキーボードを２台の装置で共用する場合
のキーボードと装置の従来の接続構成を示すブロック図
、第２図はこの考案の一実施例のインターフェイス回路
を使用して１個のキニボードを２台の装置で共用する装
置系の要部回路図、第３図はこの考案の別の実施例の電
気回路図である。１０はキーボード、Ｋ１１〜ＫＩｍはキー、１１□〜１
１１はコモン線、１２１〜１２ｍは読出し線、１３．１
４は装置、１５□〜１５１，２１．〜２１１はコモン選
択信号用ゲート回路を構成するナンド回路、１６１〜１
６ｍｔ２２１〜２２ｍはバッファゲート回路を構成する
アンド回路、１９゜２５はゲート線、２７．３１は切換
スイッチである。Fig. 1 is a block diagram showing a conventional connection configuration between a keyboard and a device when one keyboard is shared by two devices, and Fig. 2 is a block diagram showing a conventional connection configuration between a keyboard and a device when one keyboard is shared by two devices. FIG. 3 is an electrical circuit diagram of another embodiment of this invention. 10 is the keyboard, K11~KIm are the keys, 11□~1
11 is a common line, 121 to 12m are read lines, 13.1
4 is a device, 15□-151, 21. ~211 is a NAND circuit constituting a common selection signal gate circuit, 161~1
6mt221 to 22m are AND circuits constituting a buffer gate circuit, 19°25 is a gate line, and 27.31 is a changeover switch.

Claims

[Scope of utility model registration request]

One input terminal in a keyboard interface circuit of a device connected to a keyboard in which a plurality of keys are arranged in a matrix circuit and outputs on/off information of a group of keys selected by a common line to a readout line. a plurality of open collector or tri-state type common selection signal gates, each of which has a common selection signal line of the device, another input terminal connected to the gate line of the device, and an output terminal connected to the common line of the keyboard; a plurality of buffer gate circuits, one input terminal of which is connected to a readout line of the keyboard, another input terminal of which is connected to the gate line, and an output terminal of which is connected to a key readout signal line of the device; An interface circuit for a keyboard, characterized in that the plurality of common selection signal gate circuits and buffer gate circuits are controlled by a control signal applied to a gate line. −