Datasheet

V850ES/JG3 CHAPTER 15 ASYNCHRONOUS SERIAL INTERFACE A (UARTA)
R01UH0015EJ0300 Rev.3.00 Page 468 of 870
Sep 30, 2010
15.6.6 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 When initializing transmissions during the execution of continuous transmissions, make sure that
the UAnSTR.UAnTSF bit is 0, then perform the initialization. Transmit data that is initialized when the
UAnTSF bit is 1 cannot be guaranteed.
Figure 15-11. Continuous Transmission Processing Flow
Start
Register settings
UAnTX write
Yes
Yes
No
No
Occurrence of transmission
interrupt?
Required number of
writes performed?
End