SF16FMR2_DATA_ON
data = bit ? SF16FMR2_DATA_ON : SF16FMR2_DATA_OFF;
res = i & SF16FMR2_DATA_ON;
res |= bus_space_read_1(iot, ioh, off) & SF16FMR2_DATA_ON;
SF16FMR2_DATA_ON | SF16FMR2_CLCK_OFF | SF16FMR2_WREN_OFF
SF16FMR2_DATA_ON | SF16FMR2_CLCK_ON | SF16FMR2_WREN_OFF