Back on the BMA400 FIFO, and this might seem like a strange question but...
When using the FIFO watermark feature of the BMA400 accelorometer, it does stop filling at the watermark? I pretty sure it does but, I can't quite provide it...
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No, even though FIFO reaches to watermark level and you don't read FIFO, it can be overflowed.
Please check FIFO part in datasheet. (P.30 )
FIFO will be filled continuously. For example 50 Hz ODR, FIFO will be filled every 20 ms.
Your could read out FIFO length value to check it.