UMCON_RTS
sc->sc_mcr_rts = UMCON_RTS;
sc->sc_mcr_dtr = UMCON_DTR | UMCON_RTS;
SET(sc->sc_umcon, UMCON_RTS);
CLR(sc->sc_umcon, UMCON_RTS);
bus_space_write_2(iot, ioh, SSCOM_UMCON, UMCON_RTS);
ISSET(umcon, UMCON_RTS) ? "+" : "-",
sc->sc_umcon = UMCON_RTS|UMCON_DTR;
SET(sscombits, UMCON_RTS);
if (ISSET(sscombits, UMCON_RTS))
#define UMCON_HW_MASK (UMCON_RTS)
OUTW(SSCOM_UMCON, UMCON_RTS);