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❍ Signal method
The UART can handle data in the Non Return to Zero (NRZ) format only.
❍ Operation enable
The UART has the TXE (sending) and RXE (receiving) operation enable bits separately for
sending and receiving, which are used to control send and receive operations. If operation
becomes disabled while the operation is in progress, the following occurs.
•
If the receive operation is disabled during reception (while data is being input into the
receive-shift register), the receive operation stops when reception of the frame is completed
and receive data is stored in the input-data register (SIDR0-3).
•
If the send operation is disabled during sending (while data is being output from the send-
shift register), the send operation stops after the output-data register (SODR0-3) runs out of
data.
CHAPTER 15 UART
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