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• 2xCAN
• 2xUART
• Connect DAC to ADC.
• 2 further ADC inputs with different resistor dividers.
• Can even test debouncing; PWM to GPIO Input
• Program internal flash
• Verify CRC calculation
• Any present SPI flash
• Any present I2C flash

Cheapest would be:

• STM32G0B1CBU6; UFQFPN48; 128 Kbytes flash; 2048 erase page