Low Power UART Example

This example wakes up and receives data from a transmitter. Connect the TX of
the transmitter (P2.1) to RX (P2.0) of the receiver. Connect CTS of the
transmitter (P2.2) to RTS (P2.3) of the receiver. The debugger has the potential
to reset the receiver as it's transitioning from LP1 to LP3 so it's best to
disconnect the debugger after programming. Once both devices are programmed,
reset the transmitter, reset the receiver, press PB0 on the receiver, and press
PB0 on the transmitter to start the test.

Note: This example requires two Maxim Evaluation Kits, one for the LP_UART_RX
      application and one for the LP_UART_TX application.
