The STM32F20x family is based on the high performance ARM® CortexTM-M3 32-bit RISC core operating at up to 120MHz. This series integrates high-speed embedded memory, flash memory and system SRAM capacity up to 1M byte and 128K bytes, up to 4K bytes of backup SRAM, and a large number of connected to 2 APB bus, 2 AHB bus and 1 Enhanced I/O and peripherals for 32-bit multiple AHB bus matrices.
The series also features an adaptive real-time memory accelerator (ART AcceleratorTM) that achieves zero-waiting performance when the program is running in Flash memory at CPU frequencies up to 120MHz. This performance has been validated using the CoreMark benchmark.
All products feature three 12-bit ADC modules, two DAC modules, one low-power RTC, 12 general-purpose 16-bit timers (including two PWM timers for motor control), and two general-purpose 32-bit Timer. 1 true random number generator (RNG). All products come with standard and advanced communication interfaces. New advanced peripherals include an SDIO, an Enhanced Flexible Static Memory Control (FSMC) interface (100-pin or more), and a camera interface to a CMOS sensor. This series is also equipped with standard peripherals.
Pebble smart watch with TI STM32F205RE high performance ARM Cortex-M3 MCU 
　
Features:
Kernel: Using the ARM 32-bit CortexTM-M3 CPU, the Adaptive Real-Time Accelerator (ART AcceleratorTM) allows the program to run in zero-wait state when executed in Flash at up to 120MHz. The built-in memory protection unit enables Up to 150DMIPS/1.25DMIPS/MHz (Dhrystone 2.1) performance.
Memory
Up to 1 Mbyte of Flash memory
512 bytes of OTP memory
Up to 128 + 4 Kbytes of SRAM
Flexible staTIc memory controller that supports Compact Flash, SRAM, PSRAM, NOR and NAND memories
LCD parallel interface, 8080/6800 modes
Clock, reset, and power management
From 1.65 to 3.6 V applicaTIon supply and I/Os
POR, PDR, PVD and BOR
4 to 26 MHz crystal oscillator
Internal 16 MHz factory-trimmed RC (1% accuracy at 25 °C)
32 kHz oscillator for RTC with calibraTIon
Internal 32 kHz RC with calibration
Low power consumption
Sleep, Stop and Standby modes
VBATsupply for RTC, 20 × 32 bit backup registers, and optional 4 KB backup SRAM
3x12-bit, 0.5μs A/D converter
Up to 24 channels
Up to 6 MSPS in triple interleaved mode
2x12 bit D/A converter
General purpose DMA
16-stream DMA controller with centralized FIFOs and burst support
Up to 17 timers
Up to twelve 16-bit and two 32-bit timers, up to 120 MHz, each with up to 4 IC/OC/PWM or pulse counter and quadrature (incremental) encoder input
Debug mode
Serial wire debug (SWD) & JTAG interfaces
Cortex-M3 Embedded Trace MacrocellTM
Up to 140 I/O ports with interrupt capability:
Up to 136 fast I/Os up to 60 MHz
Up to 138 5 V-tolerant I/Os
Up to 15 communication interfaces
Up to 3 × I2C interfaces (SMBus/PMBus)
Up to 4 USARTs and 2 UARTs (7.5 Mbit/s, ISO 7816 interface, LIN, IrDA, modem control)
Up to 3 SPIs (30 Mbit/s), 2 with muxed I2S to achieve audio class accuracy via audio PLL or external PLL
2 × CAN interfaces (2.0B Active)
SDIO interface
Advanced interconnect function
USB 2.0 full-speed device/host/OTG controller with on-chip PHY
USB 2.0 high-speed/full-speed device/host/OTG controller with dedicated DMA, on-chip full-speed PHY and ULPI
10/100 Ethernet MAC with dedicated DMA: supports IEEE 1588v2 hardware, MII/RMII
8~14-bit parallel camera interface: speed up to 48Mbytes/s
CRC calculation unit
96-bit unique ID
Analog random number generator
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