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