Hello,
I apologize for asking a question that is so basic.  Using an Atmel Microcontroller and nRFAP2 in Async UART mode.
I read from various documents that when using multiple bytes, they are sent in little endian format. This is OK.
I also read: 
The bit order and USART details should follow relatively standard parameters: 
 8 Bits per Transfer, 1 Stop Bit, Least Significant Bit Sent First 
 So, for example, A4 (10100100) should be sent from first bit to last -> 00100101. This is the same for all bytes.
The system I use would transmit each byte  [A4] as 10100100 by default.  Do I need to reverse the bit order before I transmit from Micro to nRF????
OR, does this really mean:  the Transmitter sends 10100100 from left to right and the Receiver sees 00100101 from right to left AND both see the same thing!
Thanks