Single-chip microcomputer frequency testing system and method

Abstract

The invention provides a single-chip microcomputer frequency testing system comprising a single-chip microcomputer and an integrating circuit. The invention further provides a method based on the single-chip microcomputer frequency testing system. The method comprises the following steps of sending a reference signal and a test signal to a reference frequency counter and a test frequency counter,and setting a reference frequency and a test frequency; starting the counting of M periods by the reference frequency counter and the test frequency counter simultaneously, wherein the reference frequency counter counts to an M value, the PW pin is arranged at a high level, the ADC pin is arranged at the high resistance, and the integrating circuit starts to work, and the test frequency counter counts to the M value, the PW pin is arranged at the high resistance, and the ADC pin is configured to have the ADC function, and the integrating circuit is maintained, and the single-chip microcomputer measures the voltage value representing the difference between the test frequency and the reference frequency through the ADC. Compared with the related art, the single-chip microcomputer frequencytesting system and method can break through the limitation of the single-chip microcomputer speed and the counter bits, and the precision and the accuracy of the testing result are improved.

Description

technical field [0001] The invention relates to the technical field of frequency testing, in particular to a single-chip frequency testing system and method. Background technique [0002] With the development of the electronic information industry, the signal is its most basic element, and its frequency measurement plays an increasingly important role in scientific and technological research and practical applications, and the range of frequency measurement required is getting wider and wider. There are many ways to measure frequency, which are mainly divided into two categories: analog method and digital method. The traditional analog frequency test method usually uses a large number of hardware circuits such as combination circuits and sequential circuits for frequency measurement. The product is not only large in size, but also runs The speed is slow, and the measurement range is low, and the accuracy is low. Therefore, with the improvement of the requirements for freque...

AI Technical Summary

Problems solved by technology

[0004] The test frequency of single-chip microcomputer generally adopts digital frequency test method, but due to the limitation of the speed of single-chip microcomputer and the number of counter digits, it is often impossible to accurately test the higher signal frequency

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