Like are the in/out pins the same (On the TQFP)?
No, they aren't. Perhaps they have the same pinout, but they are from different product ranges:ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P andATmega16A/32AWhat means the registers etc. can be different.As steveastrouk already sad, look into the datasheets. You'll learn a lot.JanD
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WHat did the datasheet tell you ?