Circuit and method for automatically detecting Baud rate of multiple paths of serial communication interfaces

The invention relates to the field of industrial control in the field of communication, in particular to a method for automatically detecting a Baud rate of multiple paths of serial communication interfaces and a circuit for realizing the method. In the invention, automatic detection of the Baud rate of the multiple paths of serial communication interfaces is realized by depending on automatic Baud rate detection capacity and mechanism for realizing software flow control by using an LPC23xx chip. The communication Baud rate is set by an automatic Baud rate functional part of the LPC23xx chip through measuring time consumed by a bit of receiving a data stream. The circuit is suitable for occasions for carrying out serial communication at a standard Baud rate or non-standard Baud rate.