I'm using ATmega1280 with an external clock and I have some questions about the "safe operating area" for preventing EEPROM corruption with BOD.
The external clock is: Crystals 14.7456MHz 18pF HC49S SMD by CITIZEN, without clock division.
The line is linear between 2.7V and 4.5V, so according to this figure I'm supposed to be above 4.21V to be in the safe zone, but my Vcc is 3.3V and the system works great without any problems. what I'm missing? this graph is for the internal clock? (page 359)
How do I need to calculate my safe zone according to my external clock?