Over the last year or two Atmel have updated their AVR line with a 32bit machine (AVR32), new small processors with lots more features, picoPower technology to keep things cool, and now - ATXmega.
Take an ATmega, add multiple DMA channels, an event handler system, four SPI ports, four TWI ports and EIGHT USARTs in a 100 pin chip! Talk about packing it in! Oh, did I tell you that without losing ANY of the specialist ports, it can also access up to 16mb of RAM, and has an SDRAM controller built in?
Things have come a long way since the AT90S8515!
Look at Atmel or AVRfreaks for more information
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