I'm trying to understand the REF pins by reads and I've assumed my own thoughts for lack there of.
The AREF and REFIO are for analog and digital pin interrupt respectively duplicates the entire bay of pins to having their own full set of usage of analog and digital for a usage of it's own, during interrupt cycles between the Arduino being the bus (also needs interrupt, on slave and master situated to all devices connection) and another device, any one to many that also make use of INT0 & INT1 and a REF?
That seems consistent with explanations not really resulting in solid understanding uniformly said, for instance the voltage throughput explained is a variant low spectrum of voltages (as if someone projected interruption was failure applying ON for the entire reference bay new) that which must current the full circuit disposition during interruptions because it's not exacting time, in speed of electricity pausing cycling circuit halts. Therefore establishing stable circuitry with non stable pin complimented what actually occurs on the bays in extremely quickly volt changes, things more fractional of current then then a half of off to on, that's called pulling up, and on each pin at the same time for the whole A or IO bus.
So in general post I'm sort of asking what your thoughts are on that, if you have a exampled use or you see the same sort of theorized mentions that some what stay estranged but not false?
In a global memory sense of interrupt nature a circuit doesn't use any more resource for the amount of connected, only slows the more that are, their just cycle one Arduino, so long as they are designed to properly poke and peek on and off at INT0, INT1, AREF and REFIO in proper interrupt communicate (which Windows 95/98 liked to get in trouble with constantly). Like a P.C. a graphics card talks to the monitor directly, and so on through what ever device it is that is it self a function for in any situation so I suppose it's more a hardware thing.
But I'm guess... I like my guess though.