ADE7880 Phase Voltage Reading

Hello, Sir

I develop ADE7880 Hardware.

I am getting default value of all registers correctly but when i am trying to read AVRMS, its give me wrong value.

Here i connect  single phase only.

first i lock I2C port than start DSP using RUN register=1

I am trying to read value of AVRMS(0x43C1), BVRMS(0x43C3) and CVRMS(0x43C5) but its give me wrong value like......

With single phase volatage 230v, 50Hz to phase-A ONLY

AVRMS=0x001864FE (aproxi.. means not static value)

BVRMS=0x001864FE (aproxi.. means not static value)

CVRMS=0x001864FE (aproxi..means not static value)

connection with only neutral line without any phase

I can't able to find that what I have to change for proper reading  RMS value of phase voltage????????????????

Please help me

Thanking you