#define RCTRL_PADDING(x) ((x << 16) & RCTRL_PAL_MASK)
-#define RSTAT_CLEAR_RHALT 0x00800000
+#define RSTAT_CLEAR_RHALT 0x00800000
+#define RSTAT_CLEAR_RXF0 0x00000080
+#define RSTAT_RXF_MASK 0x000000ff
#define TCTRL_IPCSEN 0x00004000
#define TCTRL_TUCSEN 0x00002000