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Interrupt and status register (USART_ISR) Bit 19 RWU: Receiver wakeup from Mute mode Bit 18 SBKF: Send break flag Bit 17 CMF: Character match flag Bit 16 BUSY: Busy flag Bit 15 ABRF: Auto baud rate flag Bit 14 ABRE: Auto baud rate error Bit 11 RTOF: Receiver timeout Bit 10 CTS: CTS flag Bit 9 CTSIF: CTS interrupt flag Bit 7 TXE: Transmit data register empty Bit 6 TC: Transmission complete Bit 5 ..

Control register 3 (USART_CR3) Bit 15 DEP: Driver enable polarity selection Bit 14 DEM: Driver enable mode Bit 13 DDRE: DMA Disable on Reception Error Bit 12 OVRDIS: Overrun Disable Bit 11 ONEBIT: One sample bit method enable 0: Three sample bit method 1: One sample bit method Bit 10 CTSIE: CTS interrupt enable Bit 9 CTSE: CTS enable Bit 8 RTSE: RTS enable Bit 7 DMAT: DMA enable transmitter Bit..

Control register 2 (USART_CR2) Bits 31:28 ADD[7:4]: Address of the USART node Bits 27:24 ADD[3:0]: Address of the USART node Bit 23 RTOEN: Receiver timeout enable Bits 22:21 ABRMOD[1:0]: Auto baud rate mode 00: Measurement of the start bit is used to detect the baud rate. 01: Falling edge to falling edge measurement. 10: 0x7F frame detection. 11: 0x55 frame detection Bit 20 ABREN: Auto baud rate..

Control register 1 (USART_CR1) Bits 31:29 Reserved, must be kept at reset value Bit 28 M1: Word length M[1:0] = 00: 1 Start bit, 8 data bits, n stop bits M[1:0] = 01: 1 Start bit, 9 data bits, n stop bits M[1:0] = 10: 1 Start bit, 7 data bits, n stop bits This bit can only be written when the USART is disabled (UE=0). Bit 27 Reserved, must be kept at reset value Bit 26 RTOIE: Receiver timeout in..