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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..