Hello, I am working on the DDS AD9911 with processor ATxmega128a (atmel). Maybe anybode faced the challenge of AD9911 SPI. I can write data to register 0x00 and I read the data I have written. But when I write the data to another register, the data read from this register is different (from those written), I always read default value. For example, I write in register 0x03 the data 0x40_0x03_0x02 but read from this register 0x00_0x03_0x02. The oscillogrames of the test are below.