Descr iption: This program demonstrates a half-duplex 9600-baud UART using

// Timer_A3 using no XTAL and an external resistor for DCO ROSC. DCO used for

// TACLK UART baud generation. The program will wait in LPM4, echoing back

// a received character using 8N1 protocol. On valid RX character, the

// character is echoed back.

// Using a 100k resistor on ROSC, with default DCO setting, set DCOCLK ~ 2MHz.

// ACLK = n/a, MCLK = SMCLK ~2MHz DCOCLK