In XMega devices this concept is expanded, allowing more options in designs and coding. In Mega/Tiny AVRs there are basically three registers to make an I/O pin/port work and these are DDRx, PINx and PORTx registers. People who have been using Mega/Tiny AVR will find similarities but not monotony. XMega devices are not same as Mega/Tiny AVRs. The reference manuals and documentations of XMega devices come in colours, legends and bookmarks and so navigating these docs is pretty easy provided that one knows how to use PDF reader like the Adobe Reader efficiently. They are highly user friendly and when it comes to XMega’s documentations, there is one word I can say “Awesome”. I have always admired Atmel’s documentations, particularly datasheet and reference manuals. A quick view of the XMega I/O pins reveals the purpose of these pins. XMega I/Os have digital, analog and special purpose functions. The ATXMega32A4U just like any other micro has 34 programmable I/O pins divided unevenly amongst six IO ports. Any microcontroller must have I/O pins for taking inputs and providing outputs.
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