Datasheet
Bit 0 – TXB80 Transmit Data Bit 8 0
TXB80 is the ninth data bit in the character to be transmitted when operating with serial frames with nine
data bits. Must be written before writing the low bits to UDR0.
This bit is reserved in MSPIM.
ATmega48PA/88PA/168PA
Universal Synchronous Asynchronous Receiver ...
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Datasheet Complete
DS40002011A-page 260