JPS57197637A - Interface circuit for multipoint data input - Google Patents

Interface circuit for multipoint data input

Info

Publication number
JPS57197637A
JPS57197637A JP56084141A JP8414181A JPS57197637A JP S57197637 A JPS57197637 A JP S57197637A JP 56084141 A JP56084141 A JP 56084141A JP 8414181 A JP8414181 A JP 8414181A JP S57197637 A JPS57197637 A JP S57197637A
Authority
JP
Japan
Prior art keywords
data
power supply
serial
column
closing
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
JP56084141A
Other languages
Japanese (ja)
Inventor
Hiroshi Sato
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56084141A priority Critical patent/JPS57197637A/en
Publication of JPS57197637A publication Critical patent/JPS57197637A/en
Pending 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 improve the reliability of software through reducing the scale of a system and the work of an operator, by fetching a large number of data in a microcomputor in the form of serial data. CONSTITUTION:When a fetching instruction is issued by a microcomputer 1 to a prallel-serial converting part 11 through a control line 14, a clock signal is applied to a power supply controlling part 12 through a scanning clock line 13, and generates 8-bit power supply pattern 00000001, which is given to 8 row wires in a key switch group 4. In this case, only the first row wire of logic 1 goes to an enable state and data showing closing and opening states are fetched in the converting part 11 in parallel from a connected keyswitch 5 through No.1-No.8 column wires. Then, through a control line 15 a convertion completing signal is sent to the computor 1, which fetches the parallel input data as serial data through a transfer line 16, and completes reading of the closing and opening states of the key switches equivalent to one column.
JP56084141A 1981-05-29 1981-05-29 Interface circuit for multipoint data input Pending JPS57197637A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56084141A JPS57197637A (en) 1981-05-29 1981-05-29 Interface circuit for multipoint data input

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56084141A JPS57197637A (en) 1981-05-29 1981-05-29 Interface circuit for multipoint data input

Publications (1)

Publication Number Publication Date
JPS57197637A true JPS57197637A (en) 1982-12-03

Family

ID=13822212

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56084141A Pending JPS57197637A (en) 1981-05-29 1981-05-29 Interface circuit for multipoint data input

Country Status (1)

Country Link
JP (1) JPS57197637A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60225927A (en) * 1984-04-25 1985-11-11 Ascii Corp Keyboard interface in composite function cpu
EP1675269A1 (en) * 2004-12-22 2006-06-28 LG Electronics Inc. Serial interface to control sequential scanning of the lines of a keyboard matrix

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60225927A (en) * 1984-04-25 1985-11-11 Ascii Corp Keyboard interface in composite function cpu
EP1675269A1 (en) * 2004-12-22 2006-06-28 LG Electronics Inc. Serial interface to control sequential scanning of the lines of a keyboard matrix
US7388520B2 (en) 2004-12-22 2008-06-17 Lg Electronics Inc. Apparatus and method for decoding a key press

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