64 MHz Cortex-M0+ — where the timing lands
The STM32G071KBU3 is an STMicroelectronics STM32G0-series MCU built around a 32-bit ARM Cortex-M0+ core running at 64 MHz. That clock rate puts it in the sweet spot for cost-sensitive control loops — fast enough to handle a 20 kHz PWM update with cycle-by-cycle current limit and a Modbus RTU stack running in the background, without needing a Cortex-M3 or M4.
Peripherals and I/O — what connects where
Thirty I/O lines in a 32-UFQFN 5x5 mm package — that is a high pin-to-area ratio, which helps on dense boards but demands careful fan-out routing. The exposed pad (UFQFPN) needs a thermal via stitch under the paddle to pull heat into the ground plane; without it, the junction temperature rises faster than the 125 °C limit allows at sustained 64 MHz operation.
That removes the single-source risk for a design starting today — you are not locking into a soon-to-be-obsolete line.