NEC V850E/Dx3, Preliminary User'S Manual

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Chapter 16 Asynchronous Serial Interface (UARTA)
Preliminary User’s Manual U17566EE1V2UM00
16.5.6 Continuous transmission procedure
UARTAn can write the next transmit data to the UAnTX register when the
UARTAn transmit shift register starts the shift operation. The transmit timing of
the UARTAn transmit shift register can be judged from the transmission enable
interrupt request signal (INTUAnT).
An efficient communication rate is realized by writing the data to be transmitted
next to the UAnTX register during transfer.
Caution During continuous transmission execution, perform initialization after checking
that the UAnSTR.UAnTSF bit is 0. The transmit data cannot be guaranteed
when initialization is performed while the UAnTSF bit is 1.
Figure 16-5 Continuous transmission processing flow
S t a rt
Regi s ter s etting s
UAnTX write
Ye s
Ye s
No
No
Occ u rrence of tr a n s mi ss ion
interr u pt?
Re qu ired n u m b er of
write s performed?
End
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