The microcontroller in question is the ARM Cortex-M3, specifically featured within the STM32F1 series. This 32-bit single-core processor operates at a frequency of 36 MHz and comes equipped with 64 KB of flash memory, which is organized as a single block of 64 K x 8 bits. It is packaged in a 48-pin LQFP (Lead-Free Package) format measuring 7x7mm.