The ARM Cortex-M4 SAM4L is a microcontroller IC featuring a single-core, 32-bit processor with a clock speed of 48 MHz. It comes equipped with 128 KB of Flash memory organized as 128 K x 8 bits and is packaged in a 64-WLCSP (Wafer Level Chip Scale Package) measuring 4.31 mm x 4.43 mm.