Now, 2^68, let's get there first, irrespective of others who may already have done it already.
There's probably not enough time for this poor micro to get anywhere near it, but when I expire I can say I gave it a shot...
Note the battery arrangement even for the briefest of power outages...or up to several hours, even here they're very rare for more than a few seconds...not so 20 years ago...
Stupid and worthless idea? Yep, you bet!
A question a few may ask is why use a 28-pin device when there's so many pins free? The future implementations might/would be one response, but smaller (physically) devices mostly cannot reach these speeds...the white LED, "Record Set" is just whimsical hopefulness.
I wanted to reduce the +5V current consumption when power does fail. So the micro continues on with no real LED drain on the battery supply. If it's been running two years I don't want it to have to start over...therefore I need a way to replace the batteries without compromising that ethos...
Steve A