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Arduino Main Boards and Compatibles - Arduino A000111, The Arduino M0 Pro uses an Atmel SAMD21 processor with a 32-bit ARM Cortex M0+ core running at 48MHz. It features 256Kbytes of program (flash) memory and 32Kbytes of SRAM and can emulate up to 16Kbytes of EEPROM, providing a dramatic increase in power compared to the Arduino UNO for example. A particularly exciting feature is the Atmel Embedded Debugger (EDBG) which significantly improves your ability to debug your software without requiring additional hardware. The M0 is pin compatible with Arduino UNO shields although it operates at 3.3V, so check your shield before you plug it in. Arduino M0 Pro A000111