Control Register 3 (Usart_Cr3) - ST STM32F40 Series Reference Manual

Universal synchronous asynchronous receiver transmitter (USART)
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.
Note: These 3 bits (CPOL, CPHA, LBCL) should not be written while the transmitter is enabled.
26.6.6

Control register 3 (USART_CR3)

Address offset: 0x14
Reset value: 0x0000 0000
31 30 29 28
15 14 13 12
Reserved
Bits 31:12 Reserved, must be kept at reset value
Bit 11 ONEBIT: One sample bit method enable
Bit 10 CTSIE: CTS interrupt enable
Note: This bit is not available for UART4 & UART5.
789/1422
27 26 25
11 10 9
ONEBIT CTSIE CTSE
rw rw rw
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
0: Interrupt is inhibited
1: An interrupt is generated whenever CTS=1 in the USART_SR register
Doc ID 018909 Rev 4
24 23 22 21
Reserved
8 7 6 5
RTSE DMAT DMAR SCEN
rw rw rw rw
20 19 18 17
4 3 2 1
NACK HDSEL IRLP IREN
rw rw rw rw
RM0090
16
0
EIE
rw