Universal synchronous asynchronous receiver transmitter (USART) RM0008
646/690
24.6.6 Control register 3 (USART_CR3)
Address offset: 0x14
Reset value: 0x0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved
1514131211109876543210
Reserved CTSIE CTSE RTSE DMAT DMAR SCEN NACK
HD
SEL
IRLP IREN EIE
Res. rw rw rw rw rw rw rw rw rw rw rw
Bits 31:11 Reserved, forced by hardware to 0.
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.
Bit 9 CTSE: CTS Enable.
0: CTS hardware flow control disabled
1: CTS mode enabled, data is only transmitted when the nCTS input is asserted (tied to 0). If the
nCTS input is deasserted while a data is being transmitted, then the transmission is completed
before stopping. If a data is written into the data register while nCTS is asserted, the transmission is
postponed until nCTS is asserted.
Note: This bit is not available for UART4 & UART5.
Bit 8 RTSE: RTS Enable.
0: RTS hardware flow control disabled
1: RTS interrupt enabled, data is only requested when there is space in the receive buffer. The
transmission of data is expected to cease after the current character has been transmitted. The
nRTS output is asserted (tied to 0) when a data can be received.
Note: This bit is not available for UART4 & UART5.
Bit 7 DMAT: DMA Enable Transmitter.
This bit is set/reset by software
1: DMA mode is enabled for transmission.
0: DMA mode is disabled for transmission.
Note: This bit is not available for UART5.
Bit 6 DMAR: DMA Enable Receiver.
This bit is set/reset by software
1: DMA mode is enabled for reception.
0: DMA mode is disabled for reception.
Note: This bit is not available for UART5.
Bit 5 SCEN: Smartcard mode enable.
This bit is used for enabling Smartcard mode.
0: Smartcard Mode disabled
1: Smartcard Mode enabled
Note: This bit is not available for UART4 & UART5.
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