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Chapter 15
Asynchronous Serial Interface C (UARTC)
User’s Manual U16580EE3V1UD00
15.5.5 UART
transmit
operation
The transmission enabled status is set by setting the UCnTXE bit of the UCnCTL0 register to 1, after
UCnPWR bit was set to 1, and transmission is started by writing transmit data to the UCnTX register.
The start bit, parity bit, and stop bit are automatically added.
The data in the UCnTX register is transferred to the UARTCn transmit shift register upon the start of the
transmit operation.
A transmission enable interrupt (INTUCnT) is generated upon completion of transmission of the data of
the UCnTX register to the UARTCn transmit shift register, and thereafter the contents of the UARTCn
transmit shift register are output to the TXDCn pin LSB first.
Write of the next transmit data to the UCnTX register is enabled by generating the INTUCnT signal.
Continuous transmission is enabled by writing the data to be transmitted next to the UCnTX register
during transfer.
Figure 15-16:
UART Transmission
Remark:
If new data is written to the UCnTX register due to a transmission enable interrupt
(INTUCnT) before the complete frame has been transferred, the next transmission enable
interrupt occurs at that time the stop bit begins.
Start
bit
D0
D1
D2
D3
D4
D5
D6
D7
Parity
bit
Stop
bit
INTUCnT
Содержание V850E/PH2
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