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11.2.4. Receiver Logic
These two registers provide double buffering. The rxdata register can hold a previously received character while the subsequent character is being shifted into the receiver shift register.
A host peripheral can monitor the receiver's status by reading the status register's read-ready (RRDY), receiver-overrun error (ROE), break detect (BRK), parity error (PE), and framing error (FE) bits. The receiver logic automatically detects the correct number of start, stop, and parity bits in the serial RXD stream as required by the RS-232 specification. The receiver logic checks for four exceptional conditions, frame error, parity error, receive overrun error, and break, in the received data and sets corresponding status register bits.