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tech info regarding TL16CP754C UART

I am unable to continuously read from the UART RX FIFO. If i set the trigger level to 60 bytes of data, i can read only 60 bytes of data, though i am giving 80 bytes of data. Rest 20 bytes of data are not stored in the RX FIFO. may i know why it happens so? is it the limitation of UART?