The Datasheet contains two conflicting descriptions: In the timing diagram on
page 8, D0 = LSB first sent from the microcontroller. From page 18 'Shift
Register', I understand that bit 15 = MSB is sent first by the microcontroller.
Which description is correct?
The MSB should be shifted first. Figure 4 is probably a bit confusing but when
the data is sampled (falling edge of \SYNC) the data is X.