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FIFO in 16c750 UART

Discussion in 'Electronic Design' started by Valentin Tihomirov, Nov 18, 2003.

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  1. Hi,
    UART has Transmitter Hold Register Empty (THRE) flag signaling that there is
    at least 1 byte in FIFO. What is this information intended for? Transmitter
    Shift Register Empty (TSRE) tells whether UART transmits something, this is
    useful to keep our rs232 driver enabled. I want to write into FIFO. My
    qestion is how do I know that there is at least one available location in
    FIFO? Using THRE for this purpose means very poor resourse (FIFO)
    utilization. Cannot find Tx-Fifo-is-Full flag.
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