EPCOM_Data
c = bus_space_read_4(iot, ioh, EPCOM_Data);
bus_space_write_4(iot, ioh, EPCOM_Data,
bus_space_read_4(iot, ioh, EPCOM_Data);
bus_space_write_4(iot, ioh, EPCOM_Data, c);
c = bus_space_read_4(iot, ioh, EPCOM_Data);