Fujitsu MB90895 Series Hardware Manual page 441

G
Communication procedure
Communications start at any timing from the transmitting end when transmit data is provided.On the
transmission side, load transmit data into the serial output data register (SODR0) and set the transmission
enable bit (SCR0: TXE) in the serial control register to 1 to start transmission.
Figure 14.6-8 gives an example of transferring receive data to the transmitting end to inform the
transmitting end of normal reception.
Figure 14.6-8 Flowchart for Bidirectional Communication
(Transmission side)
Operating mode setting
(one of 0,1,2)
Setting 1-byte data to
SODR0 and communication
With reception
NO
Reception data reading
and processing
Start
Data transmission
data
YES
Data transmission
(Reception side)
Start
Operating mode setting
(synchronized with tranmission side)
With reception
NO
data
YES
Reception data reading
and processing
1-byte data transmission
CHAPTER 14 UART0
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