STM32F103xx performance line family incorporates the high-performance ARM® Cortex™-M3 32-bit RISC core operating at a 72 MHz frequency, high-speed embedded memories, and an extensive range of enhanced I/Os and peripherals connected to two APB buses. All devices offer two 12-bit ADCs, three general-purpose 16-bit timers plus one PWM timer, as well as standard and advanced communication interfaces: up to two I²Cs and SPIs, three USARTs, an USB and a CAN. The STM32F103xx low-density performance line family operates from a 2.0 to 3.6 V power supply. It is available in both the –40 to +85 °C temperature range and the –40 to +105 °C extended temperature range. A comprehensive set of power-saving mode allows the design of low-power applications.

The STM32F103xx low-density performance line family includes devices in four different package types: from 36 pins to 64 pins. Depending on the device chosen, different sets of peripherals are included, the description below gives an overview of the complete range of peripherals proposed in this family.

Specs

With respect to the STM32F103C8T6, It has less Flash and SRAM, one less timer, and one less Serial.

	STM32F103C6T6	STM32F103C8T6
Flash	32K	64K
RAM	10K	20K
Timer	3 (No timer 4)	4
Serial port	2 (No serial port 3)	3
I₂C	1	2
SPI	1	2+

ARM 32-bit Cortex™-M3 CPU Core
- 72 MHz maximum frequency,1.25 DMIPS/MHz (Dhrystone 2.1) performance at 0 wait state memory access
- Single-cycle multiplication and hardware division
Memories
- 16 or 32 Kbytes of Flash memory
- 6 or 10 Kbytes of 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 crystal oscillator
- Internal 8 MHz factory-trimmed RC
- Internal 40 kHz RC
- PLL for CPU clock
- 32 kHz oscillator for RTC with calibration
Low power
- Sleep, Stop and Standby modes
- VBAT supply for RTC and backup registers
2 x 12-bit, 1 μs A/D converters (up to 16 channels)
- Conversion range: 0 to 3.6 V
- Dual-sample and hold capability
- Temperature sensor
DMA
- 7-channel DMA controller
- Peripherals supported: timers, ADC, SPIs, I²Cs and USARTs

Up to 51 fast I/O ports
- 26/37/51 I/Os, all mappable on 16 external interrupt vectors and almost all 5 V-tolerant
Debug mode
- Serial wire debug (SWD) & JTAG interfaces
6 timers
- Two 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
6 communication interfaces
- 1 x I²C interface (SMBus/PMBus)
- 2 × USARTs (ISO 7816 interface, LIN, IrDA capability, modem control)
- 1 × SPI (18 Mbit/s)
- CAN interface (2.0B Active)
- USB 2.0 full-speed interface
CRC calculation unit, 96-bit unique ID