The SAM3U is the first Cortex-M3 MCU with USB High speed Device and integrated transceiver capable of running at up to 96MHz. It embeds general-purpose DMA and distributed SRAM to sustain high data transfer rates between multiple high-speed peripherals such as the High-speed SDIO, SD/MMC Card, SPI snd 12-bit ADC. The Cortex-M3 core improves code protection and secures multi-application/ task execution. It is also the first Cortex-M3 MCU with the boot flash bank selection for IAP. A look will now be taken at the most important features and peripherals which ease hardware design and software development.