JPS5773434A - Output reading system of code selecting circuit - Google Patents

Output reading system of code selecting circuit

Info

Publication number
JPS5773434A
JPS5773434A JP14832980A JP14832980A JPS5773434A JP S5773434 A JPS5773434 A JP S5773434A JP 14832980 A JP14832980 A JP 14832980A JP 14832980 A JP14832980 A JP 14832980A JP S5773434 A JPS5773434 A JP S5773434A
Authority
JP
Japan
Prior art keywords
circuit
code
output
supplied
switch
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
JP14832980A
Other languages
Japanese (ja)
Inventor
Takashi Nagaoka
Takeyoshi Koseki
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14832980A priority Critical patent/JPS5773434A/en
Publication of JPS5773434A publication Critical patent/JPS5773434A/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)

Abstract

PURPOSE:To reduce the time required for the reading process, by simultantously carrying out the selection of a switch and the reading for the code output of a selected switch only with a reading indstruction. CONSTITUTION:Both commands CMDO- 3 of the terminals to be connected and a control signal DEV are supplied to a switch selection circuit 3 when a reading instruction is produced from a microprocessor. Thus the output of the circuit 3 is supplied to a latching ciruit 4. Then a read strobe signal IOR is supplied to the circuit 4 from the microprocessor, and accordingly the output of the circuit 4 is produced. This output is supplied to a code covering circuit 6 via a code selection circuit 5 to be converted into a prescribed code. The circuit 6 produces a prescribed code output of the switch group selected at the circuit 5 in the form of code signals B0-B3 when the signal IOR is supplied.
JP14832980A 1980-10-24 1980-10-24 Output reading system of code selecting circuit Pending JPS5773434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14832980A JPS5773434A (en) 1980-10-24 1980-10-24 Output reading system of code selecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14832980A JPS5773434A (en) 1980-10-24 1980-10-24 Output reading system of code selecting circuit

Publications (1)

Publication Number Publication Date
JPS5773434A true JPS5773434A (en) 1982-05-08

Family

ID=15450334

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14832980A Pending JPS5773434A (en) 1980-10-24 1980-10-24 Output reading system of code selecting circuit

Country Status (1)

Country Link
JP (1) JPS5773434A (en)

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