AVR-Chat

The regulator probably needs 1 - 1.5 volts head room, which your battery is not supplying. Just remove the regulator. Or use two batteries in series to push the voltage up.

--- In AVR-Chat@yahoogroups.com, Phillip Vogel <phillip@...> wrote:
>
> 
> 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?
>