JPS5688529A - Key input control system - Google Patents

Key input control system

Info

Publication number
JPS5688529A
JPS5688529A JP16555679A JP16555679A JPS5688529A JP S5688529 A JPS5688529 A JP S5688529A JP 16555679 A JP16555679 A JP 16555679A JP 16555679 A JP16555679 A JP 16555679A JP S5688529 A JPS5688529 A JP S5688529A
Authority
JP
Japan
Prior art keywords
time
bounce
key
input
key input
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
JP16555679A
Other languages
Japanese (ja)
Inventor
Hiroshi Uehara
Naruhiro Fujii
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 JP16555679A priority Critical patent/JPS5688529A/en
Publication of JPS5688529A publication Critical patent/JPS5688529A/en
Pending legal-status Critical Current

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  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE: To improve the operativity of a key input device with conductive rubber contacts, metallic contacts, or the like that provides fast, light key touch input, by detecting and judging a make shorter than a monitor time as a bounce.
CONSTITUTION: During a key read, input key discriminating circuit 23 reads a key signal by timer 29 at any time; when a key signal is turned off owing to a bounce, the off time is counted by monitoring circuit 28, which when the count value is less than a certain value, judges that as a bounce. On the other hand, when the off-time is longer than a certain time, that is considered to be caused by the key input. Since the normal bounce time is 10W20ms and the time interval of the repetitive depression of keys is about 100ms, they can be distinguished. For this purpose, the ≤30ms off-time is set as a bounce to monitoring circuit 28, so that an influence of the bounce can be eliminated.
COPYRIGHT: (C)1981,JPO&Japio
JP16555679A 1979-12-21 1979-12-21 Key input control system Pending JPS5688529A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16555679A JPS5688529A (en) 1979-12-21 1979-12-21 Key input control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16555679A JPS5688529A (en) 1979-12-21 1979-12-21 Key input control system

Publications (1)

Publication Number Publication Date
JPS5688529A true JPS5688529A (en) 1981-07-18

Family

ID=15814601

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16555679A Pending JPS5688529A (en) 1979-12-21 1979-12-21 Key input control system

Country Status (1)

Country Link
JP (1) JPS5688529A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5860340A (en) * 1981-10-06 1983-04-09 Brother Ind Ltd Keyboard controlling device
CN111949137A (en) * 2019-05-17 2020-11-17 凯杰益欧洲有限公司 Switch device with bounce noise suppression function and method for suppressing bounce noise

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5860340A (en) * 1981-10-06 1983-04-09 Brother Ind Ltd Keyboard controlling device
CN111949137A (en) * 2019-05-17 2020-11-17 凯杰益欧洲有限公司 Switch device with bounce noise suppression function and method for suppressing bounce noise
CN111949137B (en) * 2019-05-17 2024-05-07 美商沃耶特拉海龟滩有限公司 Switch device with bounce noise suppression function and method for suppressing bounce noise

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