JPS57197638A - Input device - Google Patents

Input device

Info

Publication number
JPS57197638A
JPS57197638A JP56083156A JP8315681A JPS57197638A JP S57197638 A JPS57197638 A JP S57197638A JP 56083156 A JP56083156 A JP 56083156A JP 8315681 A JP8315681 A JP 8315681A JP S57197638 A JPS57197638 A JP S57197638A
Authority
JP
Japan
Prior art keywords
input
circuit
input terminal
pieces
scan pulse
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
JP56083156A
Other languages
Japanese (ja)
Other versions
JPS6256530B2 (en
Inventor
Kazuhiro Yamanishi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP56083156A priority Critical patent/JPS57197638A/en
Publication of JPS57197638A publication Critical patent/JPS57197638A/en
Publication of JPS6256530B2 publication Critical patent/JPS6256530B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
    • H03M11/20—Dynamic coding, i.e. by key scanning

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE:To increase number of an input signal without increasing number of a scan pulse or an input terminal of an input circuit by inputting data to it when all the scan pulse outputs have become inactive. CONSTITUTION:When outputs of all scan pulses from n piece terminals of a scan pulse output circuit 1 come to the low potential, the input terminal of an input circuit 2 becomes either low potential or high potential in compliance with the potential of an extra external input terminal 6. The impedance of a circuit to be connected to the external input terminal 6 has been arranged well smaller than a resistance 5. Therefore, it can fetch the n+1th input. Thus, in the case that the output terminals of the circuit 1 are n pieces and those of the circuit 2 are m pieces, it is possible to input (n+1)Xm signals, which means that the number of input signals can be increased by m pieces more than the conventional one.
JP56083156A 1981-05-29 1981-05-29 Input device Granted JPS57197638A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56083156A JPS57197638A (en) 1981-05-29 1981-05-29 Input device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56083156A JPS57197638A (en) 1981-05-29 1981-05-29 Input device

Publications (2)

Publication Number Publication Date
JPS57197638A true JPS57197638A (en) 1982-12-03
JPS6256530B2 JPS6256530B2 (en) 1987-11-26

Family

ID=13794375

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56083156A Granted JPS57197638A (en) 1981-05-29 1981-05-29 Input device

Country Status (1)

Country Link
JP (1) JPS57197638A (en)

Also Published As

Publication number Publication date
JPS6256530B2 (en) 1987-11-26

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