KR920006136A - Cover Open Checking Method and Circuit Using Key Scan Port of Central Processing Unit of Electronic Typewriter - Google Patents

Cover Open Checking Method and Circuit Using Key Scan Port of Central Processing Unit of Electronic Typewriter Download PDF

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Publication number
KR920006136A
KR920006136A KR1019900014012A KR900014012A KR920006136A KR 920006136 A KR920006136 A KR 920006136A KR 1019900014012 A KR1019900014012 A KR 1019900014012A KR 900014012 A KR900014012 A KR 900014012A KR 920006136 A KR920006136 A KR 920006136A
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KR
South Korea
Prior art keywords
processing unit
central processing
cover open
key
electronic typewriter
Prior art date
Application number
KR1019900014012A
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Korean (ko)
Inventor
조배환
Original Assignee
정용문
삼성전자 주식회사
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.)
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Publication date
Application filed by 정용문, 삼성전자 주식회사 filed Critical 정용문
Priority to KR1019900014012A priority Critical patent/KR920006136A/en
Publication of KR920006136A publication Critical patent/KR920006136A/en

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Abstract

내용 없음No content

Description

전자식 타자기의 중앙처리장치의 키(Key) 스캔포트(Scan Port)를 이용한 커버오픈 체크방법과 그 회로Cover Open Checking Method and Circuit Using Key Scan Port of Central Processing Unit of Electronic Typewriter

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제2도는 이 발명에 따른 중앙처리장치의 키 스캔포트를 이용한 커버오픈 체크회로도.2 is a cover open check circuit using a key scan port of a central processing unit according to the present invention.

제3도는 제2도에서의 중앙처리장치의 키 스캔(Key Scan)출력파형도이다.3 is a key scan output waveform diagram of the central processing unit in FIG.

Claims (2)

키 매트릭스에 연결되는 키 스캔포트와 키 리턴포트를 포함하는 중앙처리장치를 구비한 전자식 타자기에서 있어서, 상기 키 스캔포트에서 1듀티동안 키 스캔수와 동일한 로직 "L"신호를 발생하여 이 로직신호들 사이의 로직 "H"레벨 기간에 커버오픈 스위치의 입력을 체크하도록 되는 전자식 타자기의 중앙처리장치의 키 스캔포트를 이용한 커버오픈 체크방법.In an electronic typewriter having a central processing unit including a key scan port and a key return port connected to a key matrix, the logic scan signal is generated by generating a logic "L" signal equal to the number of key scans for one duty at the key scan port. Cover open check method using the key scan port of the central processing unit of the electronic typewriter to check the input of the cover open switch in the logic "H" level period between the two. 중앙처리장치(1)의 키스캔포트(P1)에 커버오픈 스위치(SW)의 온,오프에 따라 출력로직이 전환되는 인버터(I1)가 접속되어서 되는 전자식 타자기의 중앙처리장치의 키 스캔포트를 이용한 커버오픈 체크회로.The key scan port of the central processing unit of the electronic typewriter, which is connected to the kiss can port P1 of the central processing unit 1, is connected to an inverter I1 which output logic is switched on or off by the cover open switch SW. Cover open check circuit used. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019900014012A 1990-09-05 1990-09-05 Cover Open Checking Method and Circuit Using Key Scan Port of Central Processing Unit of Electronic Typewriter KR920006136A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019900014012A KR920006136A (en) 1990-09-05 1990-09-05 Cover Open Checking Method and Circuit Using Key Scan Port of Central Processing Unit of Electronic Typewriter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019900014012A KR920006136A (en) 1990-09-05 1990-09-05 Cover Open Checking Method and Circuit Using Key Scan Port of Central Processing Unit of Electronic Typewriter

Publications (1)

Publication Number Publication Date
KR920006136A true KR920006136A (en) 1992-04-27

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ID=67542556

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019900014012A KR920006136A (en) 1990-09-05 1990-09-05 Cover Open Checking Method and Circuit Using Key Scan Port of Central Processing Unit of Electronic Typewriter

Country Status (1)

Country Link
KR (1) KR920006136A (en)

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