Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 17 ASYNCHRONOUS SERIAL INTERFACE C (UARTC)
R01UH0042EJ0500 Rev.5.00 Page 746 of 1513
Aug 12, 2011
17.6.6 Continuous transmission procedure
UARTCn can write the next transmit data to the UCnTX register when the UARTCn transmit shift register starts the shift
operation. The transmit timing of the UARTCn transmit shift register can be judged from the transmission enable interrupt
request signal (INTUCnT). An efficient communication rate is realized by writing the data to be transmitted next to the
UCnTX register during transfer.
Caution When initializing transmissions during the execution of continuous transmissions, make sure that
the UCnSTR.UCnTSF bit is 0, then perform the initialization. Transmit data that is initialized when the
UCnTSF bit is 1 cannot be guaranteed.
Figure 17-13. Continuous Transmission Processing Flow
Start
Register settings
UCnTX write
Yes
Yes
No
No
Occurrence of transmission
interrupt?
Required number of
writes performed?
End