First of all, the new Universal Serial Communication Interface, or USCI, is an improvement over previous serial communication peripherals on the MSP430. It is fully code compatible with other 5xx serial code. Additionally, there is a register map available in the application note on migrating to this family from the other MSP430 generations. It is not very difficult, but some registers have been expanded and changed to facilitate this new performance. New features include its own hardware interrupt for both transmit exceptions and start bit detection in UART mode, a de-glitch filter for increased flexibility and robustness, and an enhanced baud rate calculator for more flexible modulation pattern settings.