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Arduino Uno / Leonardo Arduino Mega Stellaris Launchpad
MCU ATmega328 / ATmega32u4 ATmega1280/ATmega2560 LM4F120H5QR
arch 8-bit AVR 8-bit AVR 32-bit ARM Cortex M4F
clock 16 MHz 16 MHz 80 MHz
logic 5 V 5 V 3.3 V
GPIO 14/20 54 35
PWM 6/7 (8-bit) 14 (8-bit) 12 (16-bit) + 12 (32-bit)
ADC 6 (10-bit) 16 (10-bit) 12 (12-bit)
Flash 32 KB 128/256 KB 256 KB
SRAM 2/2.5 KB 8 KB 32 KB
UART 1x 4x 8x
SSI/SPI 1x 1x 4x
I2C - - 4x
CAN - - 1x
USB UART only/UART+HID UART only full client
extra 2x Analog Comparator

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