JPS57208474A - Measuring device for duty ratio - Google Patents

Measuring device for duty ratio

Info

Publication number
JPS57208474A
JPS57208474A JP9393781A JP9393781A JPS57208474A JP S57208474 A JPS57208474 A JP S57208474A JP 9393781 A JP9393781 A JP 9393781A JP 9393781 A JP9393781 A JP 9393781A JP S57208474 A JPS57208474 A JP S57208474A
Authority
JP
Japan
Prior art keywords
counter
duty ratio
signal
microcomputer
signalnot
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
JP9393781A
Other languages
Japanese (ja)
Inventor
Kazuo Yoshimura
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.)
Fujitsu General Ltd
Aerojet Rocketdyne Holdings Inc
Original Assignee
Fujitsu General Ltd
Gencorp Inc
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 Fujitsu General Ltd, Gencorp Inc filed Critical Fujitsu General Ltd
Priority to JP9393781A priority Critical patent/JPS57208474A/en
Publication of JPS57208474A publication Critical patent/JPS57208474A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
    • G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
    • G01R29/0273—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values the pulse characteristic being duration, i.e. width (indicating that frequency of pulses is above or below a certain limit)

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

PURPOSE:To simplify an interface circuit between a signal soure and a microcomputer, by measuring a duty ratio of a signal by means of a microcomputer without the use of a counter, a timer circuit and the like. CONSTITUTION:When a program starts, a number N equivalent to a measuring time is set at a counter 14 of a RAM11, and an oscillating signal from a given signal souce 4a selected and assigned by an input data line connected to an interface circuit 12 is inputted to a microcomputer 1. A microprocessor unit (MPU)9 detects a level in a data. When[a signalnot equal to 0]is set to[NO], a counter 14 counts -1 at each loop, and[a signalnot equal to 0]is set to[YES], a counter 13 conts +1 and further a counter 14 counts -1. When the counter 14 attains ''0'', the MPU9 computes and finds a duty ratio from accumulating addition values M and N of the counters 13 and 14, operating D=M/N.
JP9393781A 1981-06-19 1981-06-19 Measuring device for duty ratio Pending JPS57208474A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9393781A JPS57208474A (en) 1981-06-19 1981-06-19 Measuring device for duty ratio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9393781A JPS57208474A (en) 1981-06-19 1981-06-19 Measuring device for duty ratio

Publications (1)

Publication Number Publication Date
JPS57208474A true JPS57208474A (en) 1982-12-21

Family

ID=14096342

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9393781A Pending JPS57208474A (en) 1981-06-19 1981-06-19 Measuring device for duty ratio

Country Status (1)

Country Link
JP (1) JPS57208474A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011076103A1 (en) * 2009-12-22 2011-06-30 Byd Company Limited Method and device for detecting pwm wave
JP2019007886A (en) * 2017-06-27 2019-01-17 ラピスセミコンダクタ株式会社 Duty cycle detection circuit and duty cycle detection method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011076103A1 (en) * 2009-12-22 2011-06-30 Byd Company Limited Method and device for detecting pwm wave
US8878603B2 (en) 2009-12-22 2014-11-04 Shenzhen Byd Auto R&D Company Limited Method and device for detecting PWM wave
JP2019007886A (en) * 2017-06-27 2019-01-17 ラピスセミコンダクタ株式会社 Duty cycle detection circuit and duty cycle detection method

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