64 MHz Cortex-M0+ — what the clock speed means for the BOM
The 64 MHz core clock is the top end for the Cortex-M0+ in ST's G0 lineup. At this speed the part can handle typical UART polling at 115.2 kbaud, timer-based PWM updates at tens of kilohertz, and moderate ADC sampling rates without saturating the CPU. For a BOM decision, the 64 MHz rating tells you the part is not the performance tier — that is the G4 series at 170 MHz — but it is fast enough for the majority of cost-optimized sensor-and-actuator loops. The flash wait state configuration at this frequency is a firmware detail, not a procurement one: the part boots at a lower speed and the application code bumps the clock up, which is standard for this family.
Memory budget: 64 KB Flash, 18 KB RAM
This is enough for a single-protocol stack (e.g., a simple Modbus RTU slave or a LIN node), a moderate control loop with a few hundred lines of state machine code, and a small data buffer. For a BOM fit, check your compiled firmware size against the 64 KB ceiling; the 18 KB RAM must also cover stack, global variables, and any DMA buffers.
It is a current-generation part from ST, and the base product number STM32G050 is still in full manufacturing. The 48-LQFP package is a standard, widely stocked footprint, which helps with supply continuity.