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CHAPTER 20 USART
synchronous mode 2.
• Select operation mode 1 for the master-slave connection method and use it either for the master or slave
system.
■ Synchronization methods
In asynchronous operation USART reception clock is automatically synchronized to the falling edge of a
received start bit.
In synchronous mode the synchronization is performed either by the clock signal of the master device or by
USART itself if operating as master.
■ Signal mode
USART can treat data only in non-return to zero (NRZ) format.
■ Operation enable bit
USART controls both transmission and reception using the operation enable bit for transmission (SCRn:
TXE) and reception (SCRn: RXE).
• If reception operation is disabled during reception (data is input to the reception shift register), finish
frame reception and read the received data of the reception data register (RDRn). Then stop the reception
operation.
• If the transmission operation is disabled during transmission (data is output from the transmission shift
register), wait until there is no data in the transmission data register (TDRn) before stopping the
transmission operation.
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MB96300 Super Series Hardware Manual
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