Fujitsu MB90460 Series Hardware Manual page 518

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Operation enable bit
UART controls both transmission and reception using the operation enable bit for TXE (transmission) and
that for RXE (reception). If each of the operations is disabled, stop it as follows:
• If reception operation is disabled during reception (data is input to the reception shift register), finish
frame reception and store the received data in the input data register (SIDRI). 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 output data register (SODR0/SODR1) before stopping the
transmission operation.
CHAPTER 17 UART
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