I have a SiLabs C8051F41x.

When I receive a SPIF interrupt, can I read from SPI0DAT, then write to it right afterwards? Should I check TXBMT? It seems redundant to do so. I'm missing bytes on the receive side of the SPI transmit from my module, so I was hoping some of you can lend me a clue here. Thanks!

interrupt()
{
    if (SPIF)
    {
        rx = SPI0DAT;

        [...do things depending on rx's value...]

        SPI0DAT = my_data;

        SPIF = 0;
    }

    ... (clear WCOL, MODF, and RXOVRN if needed)
}