Flag_RXFE
if (!(ISSET(flagr, Flag_RXFE))) {
if (ISSET(flagr, Flag_RXFE))
while ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) == 0
while ((bus_space_read_4(iot, ioh, EPCOM_Flag) & Flag_RXFE) != 0)
while(!ISSET(EPCOM_READ(Flag), Flag_RXFE));