Baud rate generating method, baud rate generator and communication device

Abstract

The embodiment of the invention discloses a baud rate generator which is applied to communication equipment. The baud rate generator comprises a baud rate counter which is connected with a system internal clock of the communication equipment and is used for generating duration of one communication bit, a baud rate clock signal generating module for generating a baud rate clock signal when the counting result of the baud rate counter is up to a preset threshold value, an ETU (Elementary Time Unit) counter for counting and accumulating when the counting result of the baud rate counter is up to the preset threshold value, and an initial value loading module for loading an initial value to the baud rate counter according to the counting result of the ETU counter, wherein the initial value is 0 or 1. According to the baud rate generator provided by the embodiment of the application, different initial values are set for the baud rate counter to realize fractional frequency division, so that a baud rate error between both communication parties is reduced, and a higher communication rate requirement is met. The embodiment of the application further provides a baud rate generation method and the communication equipment.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, relates to a baud rate generation method, a baud rate generator and a communication device. Background technique [0002] The baud rate is the modulation rate, which refers to the change in the unit time after the signal is modulated, that is, the number of times the carrier parameter changes in the unit time. The role of the baud rate generator is to generate the required baud rate from the chip system clock. Generally, baud rate clock frequency / baud rate factor=baud rate, for example, the traditional baud rate generation method can be expressed as: [0003] BaudRate = Fsys / (Div*16) (1) [0004] Among them, BaudRate is the baud rate, Fsys is the frequency of the clock inside the chip, and Div is the value of the frequency division factor register used to generate the baud rate. [0005] It can be seen from the formula (1) that the traditional baud rate gen...

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Problems solved by technology

[0008] However, the inventor found in the process of realizing the present invention that although the above-mentioned improved method has fine-tuned the baud rate, so that the baud rate is not limited to integer multiples of 16, it still can only pass integer Frequency division generates the baud rate, therefore, the accuracy of the baud rate generated by the improved method is still low, when the target baud rate is not an integer multiple of Fsys (that is, the reciprocal of the baud rate is not the Integer multiples of the clock cycle), there will still be a deviation between the baud rates of the two communicating parties

When the target baud rate is low, this deviation is not large; but when the target baud rate is high, the deviation between the baud rates of the two communicating parties will still be relatively large, and in severe cases, it will lead to failure of normal communication

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