I user ADE7880 initialization encounter a problem.
What reasons can cause this kind of state?
Serial Interface Choice
Second, execute three SPI write operations to a location in the
address space that is not allocated to a specific ADE7880 register
(for example 0xEBFF, where eight bit writes can be executed).
These writes allow the SS/HSA pin to toggle three times. See the
SPI Write Operation section for details on the write protocol