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Chapter 15
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UARTDn receive data register (UDnRX)
The UDnRX register is an 8-bit register that holds receive data. When
7 characters are received, 0 is stored in the highest bit (when data is received
LSB first).
In the reception enabled status, receive data is transferred from the UARTDn
receive shift register to the UDnRX register in synchronization with the
completion of shift-in processing of 1 frame.
Transfer to the UDnRX register also causes the reception complete interrupt
request signal (INTUDnR) to be output.
UARTDn transmit shift register
The transmit shift register is a shift register used to convert the parallel data
transferred from the UDnTX register into serial data.
When 1 byte of data is transferred from the UDnTX register, the shift register
data is output from the TXDDn pin.
This register cannot be manipulated directly.
UARTDn transmit data register (UDnTX)
The UDnTX register is an 8-bit transmit data buffer. Transmission starts when
transmit data is written to the UDnTX register. When data can be written to the
UDnTX register (when data of one frame is transferred from the UDnTX
register to the UARTDn transmit shift register), the transmission enable
interrupt request signal (INTUDnT) is generated.
User's Manual U18743EE1V2UM00
Asynchronous Serial Interface (UARTD)
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