I'm having what I hope is a minor problem. My circuit contains a mega644p powered by a lithium battery through a 3.3V regulator. There is a 12MHz crystal, and the CKDIV8 fuse is set, resulting in a clock speed of 1.5MHz. If I set the brown out detector to 2.7V, the chip never comes out of reset. It starts up OK if I set the BOD to off or 1.8V, but not 2.7V. I have checked the supply voltage, and it is, indeed, 3.30V. What am I missing here?
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Mega644 Brown Out Detector Problem
2011-09-15 by Phillip Vogel