The maximum clock frequency of the MSP430F249TRGCR is 16 MHz.
The MSP430F249TRGCR has 60 KB of flash memory.
Yes, the MSP430F249TRGCR can operate at 3.3V, but it is also 5V tolerant.
Yes, the MSP430F249TRGCR has two built-in UARTs (USCI_A0 and USCI_A1).
The MSP430F249TRGCR can be programmed using the Spy-Bi-Wire (SBW) interface or the JTAG interface with a programmer/debugger such as the MSP-FET430UIF.