UCOM_LS_BREAK
mask |= UCOM_LS_BREAK;
if (notch_bits & UCOM_LS_BREAK)
(prev_value & UCOM_LS_BREAK) ? 1 : 0);
if (any_bits & UCOM_LS_BREAK)
(last_value & UCOM_LS_BREAK) ? 1 : 0);
ucom_line_state(sc, UCOM_LS_BREAK, 0);
ucom_line_state(sc, 0, UCOM_LS_BREAK);