User’s Manual U11969EJ3V0UM00
209
CHAPTER 8 SERIAL INTERFACE FUNCTION
8.2.3 Control registers
(1) Asynchronous serial interface mode registers 0, 1 (ASIM0, ASIM1)
These registers specify the transfer mode of the UART.
They can be read/written in 8- or 1-bit units.
Bit Position
Bit Name
Function
7
TXE
Transmit Enable
Enable/disable transmission.
0 : Disable transmission
1 : Enable transmission
6
RXE
Receive Enable
Enable/disable reception.
0 : Disable reception
1 : Enable reception
When reception is disabled, the receive shift register does not detect the start bit.
Data is not shifted into the receive shift register and neither is any transfer to the receive
buffer performed. Therefore, the previous contents of the receive buffer are retained. When
reception is enabled, the data is shifted into the receive shift register and transferred to the
receive buffer when one complete frame has been received. A reception completion interrupt
(INTSRn) is generated in synchronization with the transfer to the receive buffer.
If this bit is set to receive disabled status during receive operation, the data being received is
relinquished and the data before the receive operation is started is read out.
7
TXE
ASIM0
6
RXE
5
PS1
4
PS0
3
CL
2
SL
1
0
0
SCLS
Address
FFFFF0C0H
After reset
80H
Содержание V854 UPD703006
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