JPS5457832A - Switch sense system - Google Patents

Switch sense system

Info

Publication number
JPS5457832A
JPS5457832A JP12496777A JP12496777A JPS5457832A JP S5457832 A JPS5457832 A JP S5457832A JP 12496777 A JP12496777 A JP 12496777A JP 12496777 A JP12496777 A JP 12496777A JP S5457832 A JPS5457832 A JP S5457832A
Authority
JP
Japan
Prior art keywords
switch
column
point
state
contact
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
JP12496777A
Other languages
Japanese (ja)
Inventor
Takeshi Yoshioka
Kuniaki Kihara
Noboru 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.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon 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 NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP12496777A priority Critical patent/JPS5457832A/en
Publication of JPS5457832A publication Critical patent/JPS5457832A/en
Pending legal-status Critical Current

Links

Landscapes

  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE: To obtain a switch sence system which enables a microcomputer to be adapted to a hardly-adaptive system by shortening the time needed for a read-in process in the ON-OFF state of a switch.
CONSTITUTION: With one of N switches turned ON, output point A of the 2nd contact group 18 to which at least one of contacts of each switch is connected in parallel is grounded. The microcomputer reads and discriminates the potential state at point A every time according to each process flow. As a result, when the gound is detected or when an interruption is caused at the potential at point A, column-selective driving circuit 5 scans sequentially each column of the 1st contact group 17 of the contact matrix with its column output and row output obtained by connecting at least on contact in a matrix shape, and the ON-OFF state of the switch in each column is read into the microcomputer via buffer register 6 and control circuit 14
COPYRIGHT: (C)1979,JPO&Japio
JP12496777A 1977-10-17 1977-10-17 Switch sense system Pending JPS5457832A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12496777A JPS5457832A (en) 1977-10-17 1977-10-17 Switch sense system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12496777A JPS5457832A (en) 1977-10-17 1977-10-17 Switch sense system

Publications (1)

Publication Number Publication Date
JPS5457832A true JPS5457832A (en) 1979-05-10

Family

ID=14898638

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12496777A Pending JPS5457832A (en) 1977-10-17 1977-10-17 Switch sense system

Country Status (1)

Country Link
JP (1) JPS5457832A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5534763A (en) * 1978-09-05 1980-03-11 Hitachi Ltd Keyboard input device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5250628A (en) * 1975-10-22 1977-04-22 Fujitsu Ltd Key input reading system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5250628A (en) * 1975-10-22 1977-04-22 Fujitsu Ltd Key input reading system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5534763A (en) * 1978-09-05 1980-03-11 Hitachi Ltd Keyboard input device

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