RM0016 Universal asynchronous receiver transmitter (UART)
Doc ID 14587 Rev 8 353/449
Bit 3 TEN: Transmitter enable
(1)
(2)
This bit enables the transmitter. It is set and cleared by software.
0: Transmitter is disabled
1: Transmitter is enabled
Bit 2 REN: Receiver enable
This bit enables the receiver. It is set and cleared by software.
0: Receiver is disabled
1: Receiver is enabled and begins searching for a start bit
Bit 1 RWU: Receiver wakeup
–UART mode
This bit determines if the UART is in mute mode or not. It is set and cleared by software and can be
cleared by hardware when a wakeup sequence is recognized.
(3)
(4)
– LIN slave mode (UART2 and UART3 only, if bits LINE and LSLV are set)
While LIN is used in slave mode, setting the RWU bit allows the detection of Headers only and
prevents the reception of any other characters. Refer to Mute mode and errors on page 340. In LIN
slave mode, when RXNE is set, the software can not set or clear the RWU bit.
0: Receiver in active mode
1: Receiver in mute mode
Bit 0 SBK: Send break
This bit set is used to send break characters. It can be set and cleared by software.It should be set
by software, and will be reset by hardware during the stop bit of break.
0: No break character is transmitted
1: Break character will be transmitted
1. During transmission, a “0” pulse on the TEN bit (“0” followed by “1”) sends a preamble (idle line) after the current word.
2. When TEN is set there is a 1 bit-time delay before the transmission starts.
3. Before selecting Mute mode (by setting the RWU bit) the UART must first receive a data byte, otherwise it cannot function
in Mute mode with wakeup by Idle line detection.
4. In Address Mark Detection wakeup configuration (WAKE bit=1) the RWU bit cannot be modified by software while the
RXNE bit is set.
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