We use ADF5902, but we can not configure R7 register. We program 5902 registers by ADF5902_data initialization sequence.
The step 9 , We program R7 with value "0x01800827", but we read R7 , the value is "0x00000000". We read the other register is all right.
For this part, data is read from DOUT. The data that is read back depends on the setting of Readback Control (Reg3[10:5]). Please see register 3 map in datasheet for more info and figure 2 for timing…
I have checked this in our lab using our EV-ADF5902SD1Z and readback for R7 works fine , can you re-check your read sequence of DOUT ? regards Brigid.