ATM90E26 no energy data from registers

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hi, all

I have been working with atm90e26 interfaced with arduino the factors for voltage,current,power are calibrated and all values I am getting accurate the measured values are compared with standard meter and everything seems fine but,the energy registers give values zero and no cf pulse output also I doubt if my circuit is improper(because all I have followed from application note. And I am doing CT  based energy measurement) because all values except energy are proper.

The PL_constant high and low is also made zero so that some accumulation if energy takes place but,at that time ic's o/p's fixed constant 3-4 different values all the time for all energy related registers,

Can someone help me in this regard as why is this happening?

I replaced the IC still same problem.

I have placed isolation IC and checked but, no improvement.