I did my typical forum search and never found what I believed to be a clear answer to my question. Per the datasheets (Atmega32U4 in particular) when they show the specification for Max speed vs Vcc, I see this as being ambiguous. Does MAX SPEED refer to the CPU clocking frequency or the input clock frequency. i.e. if I use a 16 MHz crystal and set the clock prescaler to give myself a CPU speed of 8 Mhz and if Vcc is at 3.2V, does this comply with the spec?
I would appreciate your thoughts regarding this.