ADT7310 anomaly DOUT of continuous read mode

Hello

Why DOUT output below red square area?

<Setup>

After power up

1) Configuration: To write 0x0880 (command data + Register data ) for address 0x01 

2) Command send: 0x54

Yellow: CS

Blue: SCLK

Purple: DIN

Green: DOUT

<back ground>

My customer is evaluating ADT7310 on their trial PCB.

They observed above scope shot.

Best Regards

T.Kamino