> Has anyone seen problems like this before?  Is the Mega128 internal 
> BOD not capable of handling slow voltage rises?

I've seen it on other processors.
About nothing built can handle reaaaaaally slow rise times. Some 
manufacturers give a rise time spec (eg Philips), some don't (eg Zilog 
(in cases I am aware of). In the latter type of cases you can claim 
failure to meet published specs, but don't expect that to help.

If you have really slow rise times the only guaranteed way to fix 
things is to control the power supply turn on. Effectively provide a 
brown out detector on the power supply and never apply power to the IC 
until you can turn it up at a guaranteed OK rate. Sounds drastic but 
anything less can cause problems. Ask me how I know ;-) .


        RM 

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