I am referring to the application note AT11626: SAM D SERCOM USART Configuration. In my setup SAMD21J18A is communicating over uart with other microcontroller. The code given in application pdf worked for 9600 baud rate but if I increase it beyond 115200 baud rate the data transmission/reception fails. I thought that the other microcontroller which I am using is not functioning correctly but after I verified it, I found that samd code is posing a problem. Please help.