4.13.5.2.4 Receiver Overrun

The OVRE status bit in DBGU_SR is set if DBGU_RHR has not been read by the software (or the DMA Controller) since the last transfer, the RXRDY bit is still set and a new character is received. OVRE is cleared when the software writes a 1 to the bit RSTSTA (Reset Status) in DBGU_CR.