ADUC7020 SPI issue

Hello, I encounter issue using the aduc7020 in spi slave mode.
I am implementing a spi driver in assembler by polling the SPISTA register status and with a clock parity and clockphase set to 1.

I do observe corrupted reading/writing and can t provide a confident result.

Is there any known limitation or bugs on the silicon of this chip?

Thank you

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