The datasheet says to measure power just measure frequency, and this can be done almost with any PIC microcontroller regardless it is 8bits or 32 bits.
Even the dataasheet of ADE7757 suggest how to measure power using a microcontroller, i.e. using a timer / counter to measure frequency.
it seems that my question is not clear. :sad: sorry about that. what i meant to say is that even though i use ade7757 which is 16-bit, is it okay to use an 8-bit microcontroller? im actually concern about the transfer of data..