The GND pins are internally connected together, so you could get away with leaving 1 or more of them unconnected... but it's good practice to connect all the GND pins to circuit ground to minimise power rail glitches and give the best performance for analog-digital conversions.
The same goes for Vcc connections - connect them all and use decoupling capacitors as advised in data sheets for the most robust performance, especially where you are sourcing/sinking significant current on the I/O pins. _________________ If all else fails, read the manual. Even better: read the manual before something fails. If you can't find it in the manual, search the forum.
BascomAVR 2.0.8.5
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