Stimmt das jetzt, dass die High Adresse zuerst kommt und dann die Low-Adresse?
Wenn man dem Datenblatt vertrauen kann, stimmt es.

Therefore the next byte transmitted by
the master is the high-order byte of the word address
and will be written into the address pointer of the 24C64.
The next byte is the least significant address byte . After
receiving another acknowledge signal from the 24C64
the master device will transmit the data word to be written
into the addressed memory location.