KR910010281A - Key recognition device by PWM demodulation - Google Patents

Key recognition device by PWM demodulation Download PDF

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Publication number
KR910010281A
KR910010281A KR1019890016300A KR890016300A KR910010281A KR 910010281 A KR910010281 A KR 910010281A KR 1019890016300 A KR1019890016300 A KR 1019890016300A KR 890016300 A KR890016300 A KR 890016300A KR 910010281 A KR910010281 A KR 910010281A
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KR
South Korea
Prior art keywords
key
recognition device
comparator com
key recognition
microcomputer
Prior art date
Application number
KR1019890016300A
Other languages
Korean (ko)
Inventor
김영선
Original Assignee
강진구
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.)
Filing date
Publication date
Application filed by 강진구, 삼성전자 주식회사 filed Critical 강진구
Priority to KR1019890016300A priority Critical patent/KR910010281A/en
Publication of KR910010281A publication Critical patent/KR910010281A/en

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Abstract

내용 없음No content

Description

PWM복조에 의한 키인식 장치Key recognition device by PWM demodulation

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

제1도는 본 발명의 회로도,1 is a circuit diagram of the present invention,

제2도는 본 발명의 동작 파형도,2 is an operational waveform diagram of the present invention,

제3도는 본 발명의 흐름도.3 is a flow chart of the present invention.

Claims (1)

전자 응용기기의 키인식장치에 있어서, 시스템을 제어하는 마이컴(10)과, 다수의 스위치로 이루어져 선택된 스위치의 온/오프상태에 따라 해당 키인식신호를 발생하는 키입력부(20)와, 상기 키 인식신호와 소정의 기준신호를 비교한 결과 상기 마이컴(10)의 제1포트(A)로 PWM펄스를 발생하는 비교기(COM)와, 상기 비교기(COM)의 반전단자(-)와 전원공급단 사이에 접속된 저항(R)와, 상기 비교기(COM)의 반전단자(-)와 접지사이에 접속된 콘덴서(C)와, 상기 비교기(COM)의 반전단자(-)에 애노드가 접속되고 캐소드가 상기 마이컴(10)의 제1포트(B)에 접속된 다이오드(D5)로 이루어진 기준전압 설정부로 구성됨을 특징으로 하는 키인식장치.In the key recognition device of the electronic application device, the microcomputer 10 for controlling the system, a key input unit 20 consisting of a plurality of switches to generate the corresponding key recognition signal according to the on / off state of the selected switch, and the key A comparator COM generating a PWM pulse to the first port A of the microcomputer 10 as a result of comparing the recognition signal with a predetermined reference signal, an inverting terminal (-) of the comparator COM and a power supply terminal. A cathode is connected to the resistor R connected between the capacitor C, a capacitor C connected between the inverting terminal of the comparator COM, and the ground, and an inverting terminal of the comparator COM. Key recognition device, characterized in that consisting of a reference voltage setting unit consisting of a diode (D5) connected to the first port (B) of the microcomputer (10). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019890016300A 1989-11-10 1989-11-10 Key recognition device by PWM demodulation KR910010281A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019890016300A KR910010281A (en) 1989-11-10 1989-11-10 Key recognition device by PWM demodulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019890016300A KR910010281A (en) 1989-11-10 1989-11-10 Key recognition device by PWM demodulation

Publications (1)

Publication Number Publication Date
KR910010281A true KR910010281A (en) 1991-06-29

Family

ID=67660948

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019890016300A KR910010281A (en) 1989-11-10 1989-11-10 Key recognition device by PWM demodulation

Country Status (1)

Country Link
KR (1) KR910010281A (en)

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