Fujitsu MB90460 Series Hardware Manual page 524

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Communication procedure
Communication starts from the transmitting system at an optional timing when transmission data has been
prepared. An ANS is returned periodically (byte by byte in this example) when the receiving system
receives transmission data. Figure 17.7-6 shows an example of a bidirectional communication flowchart.
Figure 17.7-6 Example of Bidirectional Communication Flowchart
(Transmitting system)
Set operation mode
Set 1-byte data in UODR
and perform communication
Any received data?
NO
Read and process received data.
Start
(0 or 2)
Data transmission
YES
Data transmission
(ANS)
(Receiving system)
Start
Set operation mode(same mode
as that for the transmitting side)
Any received data?
NO
YES
Read and process received data.
Transmit 1-byte data
CHAPTER 17 UART
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