ATMEL_US_NBSTOP
mode &= ~(ATMEL_US_NBSTOP | ATMEL_US_PAR | ATMEL_US_CHRL |
mode &= ~(ATMEL_US_USCLKS | ATMEL_US_NBSTOP | ATMEL_US_PAR);
#define ATMEL_US_NBSTOP_1 FIELD_PREP(ATMEL_US_NBSTOP, 0)
#define ATMEL_US_NBSTOP_1_5 FIELD_PREP(ATMEL_US_NBSTOP, 1)
#define ATMEL_US_NBSTOP_2 FIELD_PREP(ATMEL_US_NBSTOP, 2)