In summary, there are quite a few standards to choose from when considering a serial communications protocol and in many MCUs, multiple standards are supported on the same IC. RS232 or UART is one of the most popular standards and is fully supported by some Silicon Labs MCUs. This training module provided an in-depth discussion about how this protocol is implemented, what registers are involved in initialization and during Tx/Rx, how the baud rate is generated from a timer, and what support is available from Silicon Labs.