The microcontroller in question is an ARM Cortex-M4, specifically the STM32F3. It features a 32-bit single-core processor operating at a frequency of 72 MHz. This IC has a built-in flash memory of 64 KB (organized as 64 K x 8 bits) and follows a 48-pin Land Grid Array Flip Chip Ball Grid Array (LQFP) package measuring 7x7 mm.