Fujitsu MB90480 Series Hardware Manual page 455

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Communication procedure for two-way communication function
Communication is started from the sending side with an arbitrary timing when data for
transmission is ready.
When the receiving side receives the transmission data, returns ANS (in this example,
separately for each byte) periodically.
Figure 19.5-8 illustrates the procedure for communication with the two-way communication
function.
Figure 19.5-8 Communication procedure for two-way communication function
(Sending side)
Setting the operation mode (0 or 2)
Communication after storing 1-byte data in SODR
Reception data
NO
Reading and processing reception data
Start
available?
YES
Setting the operation mode
(Matching the setting of the
Sending data
NO
Reading and processing reception data
Sending data
Sending 1-byte data
(ANS)
CHAPTER 19 UART
(Receiving side)
Start
sending side)
Reception data
available?
YES
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