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Automatic detection of baud rate serial communication 80C51 This paper introduces a 80C51 serial communications applications in the automatic detection of baud rate method. Based on experience, the program received after starting the first a character used to measure the baud rate. This method can be difficult to remember not to set the switch, but also can avoid the use of a variety of applications in the different baud rate troubles. One can imagine: a reliable method of automatic baud detection is possible, it does not have strict restrictions on the characters that can be identified. The question is: in a variety of conditions, how can a large number of characters allowed in to find out the baud rate timing interval.