AtMega164A verses ATMega164PA

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Hi,
Sorry if this has been covered a million times before, but what's the difference between A and PA vesions of ATMega164 ?

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Generally, "P" means "PicoPower". These often have one or more power control registers that the non-P versions omit. There may be a few small spec differences but I think that is the big one.

Jim

 

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Thank-you for the info Jim.

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What is the difference between 164PA and 164P(V)? Is 164PA just a new revision replacing both 164P (2.7V) and 164PV (1.8V)?

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A chips are just a manufacturing process change to a smaller process (could be 0.12um from 0.18 or 0.35um?). This was forced on Atmel who closed their fab plants and now go to a third party to get the chips made. The A variants are binary compatible - their 3 signature bytes are the same which guarantees this. If you use tools that have never heard of the "A" variants it's safe to just select the non-A versions.

(There is one exception to this rule except I can never remember which model it is - in that case the A also changed the signature - it involved a silicon fix in one register).

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Thank you for the answer