JPS5690327A - Keyboard control circuit - Google Patents

Keyboard control circuit

Info

Publication number
JPS5690327A
JPS5690327A JP16775779A JP16775779A JPS5690327A JP S5690327 A JPS5690327 A JP S5690327A JP 16775779 A JP16775779 A JP 16775779A JP 16775779 A JP16775779 A JP 16775779A JP S5690327 A JPS5690327 A JP S5690327A
Authority
JP
Japan
Prior art keywords
matrix
output
resistance
signal
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.)
Granted
Application number
JP16775779A
Other languages
Japanese (ja)
Other versions
JPS5911930B2 (en
Inventor
Takatoshi Ishii
Yuichi Saito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP54167757A priority Critical patent/JPS5911930B2/en
Publication of JPS5690327A publication Critical patent/JPS5690327A/en
Publication of JPS5911930B2 publication Critical patent/JPS5911930B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE: To prevent an operation error in case when plural keys have been operated at the same time, by scanning the key matrix arrayed in matrix, by hardware, and preventing a noise radio wave from occurring, by use of the LPF.
CONSTITUTION: The NOT circuit 11 for inputting a matrix scanning signal from the control circuit, and the LPF14 by the resistance 12 and the capacitor 13 are connected to each line of the key matrix 10 which has arrayed the key switches in matrix. Also, the pull-up resistance 16 is provided, and it detects a matrix signal which is output from each row of the matrix 10, and an output signal which has ben detected by this resistance 16 is output through the NOT circuit 15. And, generation of a noise signal is prevented by the LPF4 by scanning the matrix 10 in order by hardware. Also, in case when voltage of the output signal is below the prescribed level, the output of logic 1 can be output from the NOT circuit 15 by setting the value of the resistance 16, and an operation error is prevented when plural keys have been depressed as the same time.
COPYRIGHT: (C)1981,JPO&Japio
JP54167757A 1979-12-24 1979-12-24 keyboard control circuit Expired JPS5911930B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54167757A JPS5911930B2 (en) 1979-12-24 1979-12-24 keyboard control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54167757A JPS5911930B2 (en) 1979-12-24 1979-12-24 keyboard control circuit

Publications (2)

Publication Number Publication Date
JPS5690327A true JPS5690327A (en) 1981-07-22
JPS5911930B2 JPS5911930B2 (en) 1984-03-19

Family

ID=15855521

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54167757A Expired JPS5911930B2 (en) 1979-12-24 1979-12-24 keyboard control circuit

Country Status (1)

Country Link
JP (1) JPS5911930B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012525621A (en) * 2009-04-29 2012-10-22 ソニーモバイルコミュニケーションズ， エービー Mobile phone and method with improved keyboard scanning and reduced components

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6177505A (en) * 1984-09-26 1986-04-21 Kinugawa Rubber Ind Co Ltd Rebound bumper
JPS62177941U (en) * 1986-05-01 1987-11-12
JPS62188637U (en) * 1986-05-22 1987-12-01
JPH0378146U (en) * 1989-11-30 1991-08-07

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012525621A (en) * 2009-04-29 2012-10-22 ソニーモバイルコミュニケーションズ， エービー Mobile phone and method with improved keyboard scanning and reduced components

Also Published As

Publication number Publication date
JPS5911930B2 (en) 1984-03-19

Similar Documents

Publication Publication Date Title
JPS5690327A (en) Keyboard control circuit
JPS5567828A (en) Keyboard input device
JPS5574629A (en) Key unit
JPS5334243A (en) Device for diagnosing malfunction of elevator control unit
JPS52119122A (en) Input device for chinese character
JPS53126216A (en) Key input circuit
JPS5439636A (en) Preset counter apparatus
JPS5543632A (en) Keyboard device
JPS5515532A (en) Character input system
JPS5435626A (en) Keyboard encoder
JPS5224436A (en) Key input unit
JPS5786932A (en) Keyboard
SU1282109A1 (en) Information input device
JPS542020A (en) Key control system
JPS55140929A (en) Keyboard encoder
JPS5547739A (en) Input circuit
JPS5378731A (en) Keyboard with preference output control
JPS5690333A (en) Character processing device
JPS52153337A (en) Desk-top electronic calculator
JPS55164927A (en) Keyboard with lock function
JPS5792991A (en) Remote control device
JPS522357A (en) Key input system
JPS5541537A (en) Information recording device
JPS5478625A (en) Book mat type keybord
JPS5413221A (en) Key input system