Hi,
I want to interface the SIGFOX ATA8520E RF TRANSCEIVER interface with Ardunio uno R3(ATMEGA328P).
For that ,Is here any sample code ..can you all give some suggestion.
You might be lucky to find any sample Arduino code, but there's an ATMega328P ATmel Studio example provided on their website, along with plenty of other documentation.
The examples are in the zipped "software" folder on this page:- ATA8520, and the one for the ATMega328P is in the "ATA8520-EK1-E" folder.
It should help you to get started.
In fact, if you download the docs from Atmel's website as advised by @OldSteve you'll get some Arduino samples. They're buried in Software > ATA8520-EK2-E > Arduino.zip
You can find the hello world (sending temp & voltage) on my github: GitHub - nicolsc/AtmelSigfoxShieldEx
It should work well with the 8520E, event if it's from last year
- A full tutorial for a "connected plant" using the ATA8520 evaluation kit here : http://www.instructables.com/id/Sigfox-Talking-Plant/
Let me know if it helps ... or if you need more info 
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