PC16550D Datasheet, PDF (8/22 Pages) National Semiconductor (TI) – PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs

4 0 Timing Waveforms (Continued)
RCVR FIFO First Byte (This Sets RDR)
RCVR FIFO Bytes Other Than the First Byte (RDR Is Already Set)
TL C 8652 – 10
Receiver Ready (Pin 29) FCR0e0 or FCR0e1 and FCR3e0 (Mode 0)
TL C 8652 – 11
Note 1 This is the reading of the last byte in the FIFO
Note 2 If FCR0 e 1 then t_SINT e 3 RCLKs For a timeout interrupt t_SINT e 8 RCLKs
8
TL C 8652 – 12