Hi Spencer,

I am assuming you mean flash ram for code. You should be able to cycle power to your heart's content without corrupting it. The only time I've had code flash corrupted was when we zapped a module with a BBQ igniter to test it for ESD sensitivity...and that just required reprogramming it.

If you have a uC that has flash for data, that's a different story. It depends on what's happening when power is going off. If you're in the middle of a write, it is going to get corrupted. Use a brownout detector/power monitor, either internal or external, to give you an interrupt so you can finish writes in process (and not start any new writes) before power gets below critical levels.

Dennis