DCM_USPERCH
DCM_USPERCH(tp->t_ospeed));
DELAY(DCM_USPERCH(tp->t_ospeed));
DELAY(16 * DCM_USPERCH(tp->t_ospeed));
DELAY(DCM_USPERCH(rate));
DELAY(16 * DCM_USPERCH(rate));
DELAY(DCM_USPERCH(tp->t_ospeed));