Datasheet

Writing this bit to one will reduce the divisor of the baud rate divider from 16 to 8 effectively doubling the
transfer rate for asynchronous communication.
Bit 0 – MPCMm: Multi-processor Communication Mode
This bit enables the Multi-processor Communication mode. When the MPCMm bit is written to one, all the
incoming frames received by the USART Receiver that do not contain address information will be
ignored. The transmitter is unaffected by the MPCMm setting. For more detailed information, refer to
Multi-Processor Communication Mode on page 261.
Atmel ATmega64A [DATASHEET]
Atmel-8160E-ATmega64A_Datasheet_Complete-09/2015
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