US_MR_CHRL_8
at91usart_writereg(sc, US_MR, US_MR_CHRL_8 | US_MR_PAR_NONE | US_MR_NBSTOP_1);
at91usart_writereg(sc, US_MR, US_MR_USCLKS_MCK | US_MR_CHRL_8 \