Fujitsu F2MC-16LX MB90580 Series Hardware Manual page 156

12.4 Operations
(3) Start of communication
Communication is started by writing data in the SODR register. Virtual transmission data must be writ-
ten to the SODR register even when only reception is to be performed.
(4) End of communication
The end of communication can be checked by '1' written to the RDRF flag of the SSR register. Use the
ORE bit of the SSR register to check whether communication has been successful.
136 Chapter 12: UART MB90580 Series