Like issac said,

I knew my explanation was confusing, but I couldn't see why, FIFO is the
key word I missed, along with the important fact of being ready to accept a
byte, not 4 bytes as I  originally said.

On 11 December 2011 21:29, Isaac Marino Bavaresco <
isaacbavaresco@yahoo.com.br> wrote:

> The UART will keep setting the interrupt flag until the transmit FIFO is
> full. Then it will generate another interrupt only after one byte is
> transmitted and the FIFO can accept one more byte.
>
>
> Isaac
>
>
>
--=20
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