Dual-core ARM Cortex M0+ processor, running up to 133 MHz
264KB of SRAM, and 2MB of on-board Flash memory
Castellated module allows soldering direct to carrier boards USB
1.1 Host and Device support
Low-power sleep and dormant modes
Comprehensive C/C++/Micropython SDK, software examples,
Drag & drop programming using mass storage over USB
26 × multi-function GPIO pins
2 × SPI, 2 × I2C, 2 × UART, 3 × 12-bit ADC, 16 × controllable PWM channels Accurate clock and timer on-chip
Temperature sensor
Accelerated floating-point libraries on-chip
8 × Programmable I/O (PIO) state machines for custom peripheral support