I'm using a Mega128 and I've been experiencing some problems with slow rise (and possibly fall) times on the supply rail.  I have the internal BOD enabled at 2.7volts (nominal 3.3v operation).  

If the power switches on too slowly, I get a power on reset, often a few gibberish characters coming out of my serial link and then a watchdog timeout after which all is usualy ok.  At the same time I have experience numerous EEPROM corruption problems, despite the fact that during normal operation the EEPROM is not being written to. However there are functions that write to EEPROM for calibration purposes, I suspect that the micro is not being reset cleanly and program counter is off in the weeds and happens to trample over these functions occaisionaly.

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

Regards

Mike
 

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