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JPS57208472A - Measuring device for frequency - Google Patents

Measuring device for frequency

Info

Publication number
JPS57208472A
JPS57208472A JP9393481A JP9393481A JPS57208472A JP S57208472 A JPS57208472 A JP S57208472A JP 9393481 A JP9393481 A JP 9393481A JP 9393481 A JP9393481 A JP 9393481A JP S57208472 A JPS57208472 A JP S57208472A
Authority
JP
Japan
Prior art keywords
interrupting
counter
signal source
rise
microcomputer
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
JP9393481A
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 JP9393481A priority Critical patent/JPS57208472A/en
Publication of JPS57208472A publication Critical patent/JPS57208472A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave

Landscapes

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

Abstract

PURPOSE:To simplify an interface circuit between a signal source and a microcomputer, by measuring a frequency by means of a microcomputer without the use of a counter, a timer circuit and the like. CONSTITUTION:An oscillating signal of a signal source 4a selected and assigned by a signal source selecting circuit 3 is inputted to a microcomputer 1 through a gate circuit 15. A microprocessor unit (MPU)9 determines the presence of a rise in a data from an interrupting control line 5, an interrupting demaned bit and an interrupting mask bit are cleared by an intitial rise, and a counter of an RAM11 starts counting. A determining loop is repeated by means of a succeeding rise until an interrupting bit attains ''1'', and a counter adds 1 each time the repetition takes place. A return address is set at a program counter by an interrupting demand due to a succeeding rise, and the MPU9 frequency F of the signal source 4a, based on a content N of the counter and a period Tl of a loop, by operating a Formula F=1/N.Tl.
JP9393481A 1981-06-19 1981-06-19 Measuring device for frequency Pending JPS57208472A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9393481A JPS57208472A (en) 1981-06-19 1981-06-19 Measuring device for frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9393481A JPS57208472A (en) 1981-06-19 1981-06-19 Measuring device for frequency

Publications (1)

Publication Number Publication Date
JPS57208472A true JPS57208472A (en) 1982-12-21

Family

ID=14096258

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9393481A Pending JPS57208472A (en) 1981-06-19 1981-06-19 Measuring device for frequency

Country Status (1)

Country Link
JP (1) JPS57208472A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61284672A (en) * 1985-06-11 1986-12-15 Diesel Kiki Co Ltd Frequency measuring instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61284672A (en) * 1985-06-11 1986-12-15 Diesel Kiki Co Ltd Frequency measuring instrument

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