frequency hopping of ad9914 in DRG mode

When I test the frequency hopping of ad9914 in DRG mode,Register CFR2 is set to 00 0E
40 00,Register ox09 and ox0a are added and set at the same time,but the output is not
frequency hopping. What's the problem?
My frequency sweep function is normal. 0x01 ~ 0A registers are set as follows

//------CFR1
--------------------------------------------------------------------------------
RegisterData_DDS[3] = 0x00;
RegisterData_DDS[2] = 0x01;
RegisterData_DDS[1] = 0xC0;
RegisterData_DDS[0] = 0x00;
WriteToAD9914ViaSpi(0x00,4,RegisterData_DDS);

//------CFR2
--------------------------------------------------------------------------------
RegisterData_DDS[3] = 0x00;
RegisterData_DDS[2] = 0x0E;
RegisterData_DDS[1] = 0x40;
RegisterData_DDS[0] = 0x00;
WriteToAD9914ViaSpi(0x01,4,RegisterData_DDS);

//------CFR3
--------------------------------------------------------------------------------
RegisterData_DDS[3] = 0x00;
RegisterData_DDS[2] = 0x00;
RegisterData_DDS[1] = 0x00;
RegisterData_DDS[0] = 0x00;
WriteToAD9914ViaSpi(0x02,4,RegisterData_DDS);

//------CFR4
--------------------------------------------------------------------------------
RegisterData_DDS[3] = 0x01;
RegisterData_DDS[2] = 0x05;
RegisterData_DDS[1] = 0x31;
RegisterData_DDS[0] = 0x20;
WriteToAD9914ViaSpi(0x03,4,RegisterData_DDS);

//-----CFR5-----------------------------------------
RegisterData_DDS[3] = 0x15;
RegisterData_DDS[2] = 0xF1;
RegisterData_DDS[1] = 0x5F;
RegisterData_DDS[0] = 0x15;
WriteToAD9914ViaSpi(0x04,4,RegisterData_DDS);

//------CFR6------------------------------
RegisterData_DDS[3] = 0x49;
RegisterData_DDS[2] = 0x24;
RegisterData_DDS[1] = 0x92;
RegisterData_DDS[0] = 0x4A;
WriteToAD9914ViaSpi(0x05,4,RegisterData_DDS);

//------CFR7-----------------------------------------------
RegisterData_DDS[3] = 0x00;
RegisterData_DDS[2] = 0x00;
RegisterData_DDS[1] = 0x0E;
RegisterData_DDS[0] = 0x5E;
WriteToAD9914ViaSpi(0x06,4,RegisterData_DDS);


//-----CFR8-----------------------------------------------
RegisterData_DDS[3] = 0x00;
RegisterData_DDS[2] = 0x00;
RegisterData_DDS[1] = 0x0E;
RegisterData_DDS[0] = 0x5E;
WriteToAD9914ViaSpi(0x07,4,RegisterData_DDS);
//1E7个点

//------CFR9---------------------------------------------------
RegisterData_DDS[3] = 0x00;
RegisterData_DDS[2] = 0x10;
RegisterData_DDS[1] = 0x00;
RegisterData_DDS[0] = 0x10;
WriteToAD9914ViaSpi(0x08,4,RegisterData_DDS);


//------CFR10-------------------------------------------
RegisterData_DDS[3] = 0x24;
RegisterData_DDS[2] = 0x92;
RegisterData_DDS[1] = 0x49;
RegisterData_DDS[0] = 0x24;
WriteToAD9914ViaSpi(0x09,4,RegisterData_DDS);

//------CFR11-----------------------------------------------
RegisterData_DDS[3] = 0x3A;
RegisterData_DDS[2] = 0x83;
RegisterData_DDS[1] = 0xA8;
RegisterData_DDS[0] = 0x3B;
WriteToAD9914ViaSpi(0x0A,4,RegisterData_DDS);