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Chapter 15
Asynchronous Serial Interface C (UARTC)
User’s Manual U16580EE3V1UD00
15.5.6 Continuous transmit operation
UARTCn can write the next transmit data to the UCnTX register when the UARTCn transmit shift
register starts the shift operation. The transfer timing of the UARTCn transmit shift register can be
judged from the transmission enable interrupt (INTUCnT). Transmission can be performed without
interruption even during interrupt processing following the transmission of 1 data frame via the
INTUCnT signal, and an efficient communication rate can thus be achieved.
During continuous transmission, overrun (the completion of the next transmission before the first
transmission completion processing has been executed) may occur.
An overrun can be detected by incorporating a program that can count the number of transmit data and
by referencing transfer status flag (UCnTSF bit of UCnSTR register).
Caution:
During continuous transmission execution, perform initialization after checking that
the UCnTSF bit is 0. The transmit data cannot be guaranteed when initialization is
performed when the UCnTSF bit is 1.
Figure 15-17:
Continuous Transmission Processing Flow
Start
Register settings
UCnTX write
Yes
Yes
No
No
Occurrence of transmission
interrupt?
Required number of
writes performed?
End
Содержание MuPD70F3187
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