NCR_ESPCFG3
bus_space_write_1(iot, ioh, NCR_ESPCFG3,
bus_space_read_1(iot, ioh, NCR_ESPCFG3) | NCRESPCFG3_FCLK);
epd->sc_isfast = bus_space_read_1(iot, ioh, NCR_ESPCFG3)
sc->sc_cfg3 = NCR_READ_REG(sc, NCR_ESPCFG3);