MK20DX256 32 bit ARM Cortex-M4 72 MHz (96 Mhz overclockable)
262144 Flash memory
65536 Ram Memory
34 I/O Pins, runs on 3.3 V and is 5 Volt tolerant
21 Analogue Ins, 12 PWM’s, 3 UARTS, 2 I2C and 1 SPI input.
It comes with it’s own loader, compiler and Arduino Software Tools integration.
The RFu – 328/SRF is an Arduino compatible wireless node.It’s equipped with a 16Mhz Atmel ATMega 328P preloaded with the Arduino Uno bootloader. It can be programmed over the air as well as directly to the board’s serial or SPI pins with an FTDI breakout board.