@JSP- I don't really cover the types of processors your are asking about, but hopefully some of the techniques and triacks will still apply. Power off as much as you can (hopefully Enet, USB etc cab be powered off/down or at least gate the clocks) and make sure any external devices that are running off your battery are in low power states too. Could you use an external MCU to do the wake-up and put your processor in a really low power state? Wake time of your processor seems to be the big issue however.
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For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This discussion will examine what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.