Core and memory sizing for the BOM
The STM32F030F4P6: With 16 KB of on-chip Flash and 4 KB of SRAM, it targets cost-sensitive control applications where the code footprint stays under the flash ceiling and the stack fits within the RAM budget.
Peripheral mix and I/O allocation
Fifteen general-purpose I/O lines in the 20-pin TSSOP package leave room for a few sensor inputs, a PWM motor drive interface, and a serial link. The integrated DMA, POR, and watchdog reduce external component count. Connectivity includes I²C, SPI, and UART/USART, covering the common serial buses for sensor readout, display communication, or debug output. The 11-channel 12-bit ADC provides analog front-end support without an external converter.