Universal synchronous asynchronous receiver transmitter (USART)
RM0090
1006/1731
DocID018909 Rev 11
Note:
These 3 bits (CPOL, CPHA, LBCL) should not be written while the transmitter is enabled.
30.6.6
Control register 3 (USART_CR3)
Address offset: 0x14
Reset value: 0x0000 0000
Bit 8
LBCL
: Last bit clock pulse
This bit allows the user to select whether the clock pulse associated with the last data bit
transmitted (MSB) has to be output on the SCLK pin in synchronous mode.
0: The clock pulse of the last data bit is not output to the SCLK pin
1: The clock pulse of the last data bit is output to the SCLK pin
Note: 1: The last bit is the 8th or 9th data bit transmitted depending on the 8 or 9 bit format selected
by the M bit in the USART_CR1 register.
2: This bit is not available for UART4 & UART5.
Bit 7 Reserved, must be kept at reset value
Bit 6
LBDIE
: LIN break detection interrupt enable
Break interrupt mask (break detection using break delimiter).
0: Interrupt is inhibited
1: An interrupt is generated whenever LBD=1 in the USART_SR register
Bit 5
LBDL
:
lin
break detection length
This bit is for selection between 11 bit or 10 bit break detection.
0: 10-bit break detection
1: 11-bit break detection
Bit 4 Reserved, must be kept at reset value
Bits 3:0
ADD[3:0]
: Address of the USART node
This bit-field gives the address of the USART node.
This is used in multiprocessor communication during mute mode, for wake up with address mark
detection.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reserved
ONEBIT
CTSIE
CTSE
RTSE
DMAT
DMAR
SCEN
NACK
HDSEL
IRLP
IREN
EIE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
Bits 31:12 Reserved, must be kept at reset value
Bit 11
ONEBIT
: One sample bit method enable
This bit allows the user to select the sample method. When the one sample bit method is
selected the noise detection flag (NF) is disabled.
0: Three sample bit method
1: One sample bit method
Bit 10
CTSIE
: CTS interrupt enable
0: Interrupt is inhibited
1: An interrupt is generated whenever CTS=1 in the USART_SR register
Note: This bit is not available for UART4 & UART5.