The NXP MKL17Z128VMP4 is a 32-bit ARM Cortex-M0+ microcontroller from the Kinetis KL1 series, running at 48 MHz.
At 48 MHz, the Cortex-M0+ executes single-cycle multiply and a two-stage pipeline, leaving headroom for communication stack overhead in a control loop.
Memory sizing for firmware and data buffers
128 KB of Flash holds a moderate FreeRTOS image plus application code. The 32 KB RAM is split across SRAM and a small cache.
Package and layout note
The 64-MAPBGA (5x5 mm) package is a ball grid array. A four-layer PCB with microvias or blind vias is the practical minimum for routing all 54 I/O and power/ground balls.
The base product number MKL17Z128 covers the whole Flash/RAM/package matrix.