When a character is received, the controller checks to see if the RxFIFO has room. If it does, then the character is written into the RxFIFO. If the RxFIFO is full, then the controller waits. If a subsequent start bit on RxD is detected and the RxFIFO is still full, then data is lost and the controller sets the Rx overflow interrupt bit, uart.Chnl_int_sts [OVER] = 1. An interrupt is generated, if enabled.