Atmega328 vs STM32F103

	STM32F103C8T6		ATmega328
Price	$1.38		$2.15
Core	72 MHz		16MHz
Memories	64 or 128 Kbytes of Flash memory –   20 Kbytes of SRAM		32KBytes of In-System Self-Programmable Flash program Memory – 1KBytes EEPROM – 2KBytes Internal SRAM
Clock, reset and supply management	2.0 to 3.6 V application supply and I/Os –   POR, PDR, and programmable voltage detector (PVD) –   4-to-16 MHz cr ystal oscillator –   Internal 8 MHz factory-trimmed RC –   Internal 40 kHz RC –   PLL for CPU clock –   32 kHz oscillator for RTC with calibration		2.7 - 5.5V
Timers	7 timers –   Three 16-bit timers, each with up to 4 IC/OC/PWM or pulse counter and quadrature (incremental) encoder input –   16-bit, motor control PWM timer with dead- time generation and emergency stop –   2 watchdog timers (Independent and Window) –   SysTick timer 24-bit downcounter		3
Communications interfaces	Up to 9 communication interfaces –   Up to 2 x I2C interfaces (SMBus/PMBus) –   Up to 3 USARTs (ISO 7816 interface, LIN, IrDA capability, modem control) –   Up to 2 SPIs (18 Mbit/s) –   CAN interface (2.0B Active) –   USB 2.0 full-speed interface
Analog to digital converter (ADC)	2 x 12-bit, 1 μs A/D converters (up to 16 channels)
I/Os	Up to 80 fast I/O ports –   26/37/51/80 I/Os, all mappable on 16 external interrupt vectors and almost all 5 V-tolerant