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JPS5473520A - Keyboard input circuit - Google Patents

Keyboard input circuit

Info

Publication number
JPS5473520A
JPS5473520A JP14115977A JP14115977A JPS5473520A JP S5473520 A JPS5473520 A JP S5473520A JP 14115977 A JP14115977 A JP 14115977A JP 14115977 A JP14115977 A JP 14115977A JP S5473520 A JPS5473520 A JP S5473520A
Authority
JP
Japan
Prior art keywords
output
counter
input
data
scan
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
JP14115977A
Other languages
Japanese (ja)
Inventor
Fumiaki Mukoyama
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP14115977A priority Critical patent/JPS5473520A/en
Publication of JPS5473520A publication Critical patent/JPS5473520A/en
Pending legal-status Critical Current

Links

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  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE: To form a keyboard input circuit with a simple constitution by making the information of the counter double the scan, the data output and the ratch respectively.
CONSTITUTION: When clock is supplied to OR gate 7, counter 11 is started. And 4-input/11-output encoder 9 and 3-input/8-output encoder 10 scan both the X and Y lines to turn on switch group 13 and 12 by one unit each. In this case, if the key corresponding to the keyboard scanning line is pushed, the output of inverter 15 triggers FF16 to "1". Then the output of FF17 chaged to "1" by clock to close gate 7. As a result, counter 11 stops, and the 7-bit output data is held and transmitted to outside. In external apparatus, the data is taken in when the output of FF17 turns to "1". And signal R is turned to "1" with FF16 reset, and thus the key input action is started again. In other words, the decorder to obtain the binary information as well as the conventional ratch circuit becomes unnecessary owing to existence of counter 11.
COPYRIGHT: (C)1979,JPO&Japio
JP14115977A 1977-11-25 1977-11-25 Keyboard input circuit Pending JPS5473520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14115977A JPS5473520A (en) 1977-11-25 1977-11-25 Keyboard input circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14115977A JPS5473520A (en) 1977-11-25 1977-11-25 Keyboard input circuit

Publications (1)

Publication Number Publication Date
JPS5473520A true JPS5473520A (en) 1979-06-12

Family

ID=15285496

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14115977A Pending JPS5473520A (en) 1977-11-25 1977-11-25 Keyboard input circuit

Country Status (1)

Country Link
JP (1) JPS5473520A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725876A (en) * 1980-07-24 1982-02-10 Sofuia Kk Device for successively stopping coin game machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725876A (en) * 1980-07-24 1982-02-10 Sofuia Kk Device for successively stopping coin game machine
JPS6332469B2 (en) * 1980-07-24 1988-06-30 Sophia Co Ltd

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