C8051-based frequency division circuit and frequency division control method

Abstract

The invention relates to the technical field of frequency measurement, and in particular relates to a frequency dividing circuit based on C8051. The frequency dividing circuit comprises a single-chipmicrocomputer, an input circuit, an output circuit and a frequency division coefficient circuit. The input circuit has three inputs which are respectively connected with power supply pins of the single-chip microcomputer. The working voltage of external equipment is converted into the power supply voltage of the single-chip microcomputer; the single-chip microcomputer comprises a reset circuit, apower supply and a chip; the chip is provided with PCA module, and comprises a plurality of capture / comparison modules and a 16-bit counter / timer; the plurality of capture / comparison modules are usedfor capturing high-frequency input signals; the frequency dividing circuit is provided with six input ends which are connected with ports of the single-chip microcomputer respectively; the output circuit has three outputs which are connected with output pins of the single-chip microcomputer respectively; and the working voltage of the single-chip microcomputer is boosted through a triode to supply power to the external equipment output1, output2 and output3. The circuit and the method provided by the invention are adjustable in input frequency, and can directly measure higher frequency signals.

Description

technical field [0001] The invention relates to the technical field of frequency measurement, in particular to a C8051-based frequency division circuit and a frequency division control method. Background technique [0002] Periodic signals are ubiquitous in circuit design and measurement. For the measurement of these signals, direct frequency measurement method and periodic measurement method are often used. The direct frequency measurement method is to count the measured signal pulses in unit time, and the periodic measurement method is to count the reference clock pulses in the measured signal period. The basic idea of ​​the two methods is to compare the input unknown quantity with the known reference quantity through the gate control technology, and display it after the quantization technology is processed. In order to improve the measurement accuracy of the frequency meter, it is necessary to adopt the correct frequency division principle. In the traditional applicati...

AI Technical Summary

Problems solved by technology

In traditional application design, the input frequency is fixed and cannot be adjusted, and the maximum counting frequency of the single-chip microcomputer is limited, so it is impossible to directly measure a higher frequency signal, and the input frequency signal must be reduced before counting and measuring by the single-chip microcomputer

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