Low frequency clock signal generating method and low frequency cloc ksignal generator

Abstract

A method for generating low frequency clock signal includes confirming frequency multiplication number N1 and frequency division number N2 according to low frequency clock signal cycle T0 and source clock pulse signal TS ; receiving signal Ts and enlarging it to be clock signal of frequency N1 / TS ; narrowing clock signal of frequency N1 / TS to be 1 / N2 then outputting it for obtaining low frequency clock signal with cycle T0 .The device for generating this low frequency clock signal is also disclosed .

Description

technical field [0001] The invention relates to IT fields such as communications and networks, and in particular to a device and method for generating a low-frequency clock signal. Background technique [0002] Low-frequency clock signals are widely used in IT industries such as communications and networks, such as the lighting of system indicators and the control of watchdogs. see figure 1 , which is a schematic structural diagram of a low-frequency clock signal generating device in the prior art. It includes a clock source 1 and a CPLD (Programmable Logic Device) 2 . The clock source 1 is usually a crystal oscillator, which generates a high-frequency clock signal with a frequency of tens of megahertz (HZ). The CPLD2 needs to divide the frequency of the high-frequency clock signal to obtain a low-frequency clock signal whose frequency meets the requirements. [0003] The existing low-frequency clock signal generation method is that CPLD2 first calculates the input high-...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a low-frequency clock signal generation device and a low-frequency clock signal generation method to solve the problem of the need to add additional devices to generate low-frequency clock signals when the frequency division factor is not an integer in the prior art, or save a lot of time compared with traditional methods CPLD resources, which in turn make the generation of low-frequency clock signals costly and difficult to implement technical defects

Images