The Verona didn't have an Atmel processor, the atmel part is a serial memory module . The processor is a proprietary Kino3 IC from Frontier Silicon. No info available for that part...
So far I have figured out the buttonworks on Verona pin 25/26, the audio out on 3/5 and the LCD SPI part on pins 7/10/13/16. There are also a number of NC pins namely 8/9/12/15/17/21/23/24, GND on 4/6/14/22. Note that the NC pins are not connected on this radios main PCB! These pins have probably functions not implemented such as S/PDIF, 8ch I2S and so forth. Powerpins are 1=1.2V and 2=3.3V. Maybe pin 18 should be considered a power pin since it is taken down to 2.6V by an R-net and the buttonpins shows 2.4V - coinsidence? Maybe. I still have to follow traces on the Verona module to see if there are any clues. Left are a few pins (4) I have to think about - I have no clue yet of their workings.
There is another thread on DIYAUDIO in parts about the LCD - I believe I have found if not the specific part but almost certain the pin functions of the LCD.
The DAC part of the Verona is built on a CS4344 24/192 capable chip. The datasheet is available on the net so interfacing to a better chip is easy.
And there we go - soon we can DIY our own DAB+/FM/RDS capable radio tuners but to get full control of everything the Verona can do we need the SDK!