Introduction
This datasheet provides the ordering information and mechanical device characteristics of the STM32F100x4, STM32F100x6, STM32F100x8 and STM32F100xB microcontrollers.
In the rest of the document, the STM32F100x4 and STM32F100x6 are referred to as low-density devices while the STM32F100x8 and STM32F100xB are identified as medium-density devices.

FEATUREs
• Core: ARM® 32-bit Cortex®-M3 CPU
   – 24 MHz maximum frequency, 1.25 DMIPS/MHz (Dhrystone 2.1) performance
   – Single-cycle multiplication and hardware division
• Memories
   – 16 to 128 Kbytes of Flash memory
   – 4 to 8 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-24 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
• Debug mode
   – Serial wire debug (SWD) and JTAG interfaces
• DMA
   – 7-channel DMA controller
   – Peripherals supported: timers, ADC, SPIs, I2Cs, USARTs and DACs
• 1 × 12-bit, 1.2 µs A/D converter (up to 16 channels)
   – Conversion range: 0 to 3.6 V
   – Temperature sensor
• 2 × 12-bit D/A converters
• Up to 80 fast I/O ports
   – 37/51/80 I/Os, all mappable on 16 external interrupt vectors and almost all 5 V-tolerant
• Up to 12 timers
   – Up to three 16-bit timers, each with up to 4 IC/OC/PWM or pulse counter
   – 16-bit, 6-channel advanced-control timer: up to 6 channels for PWM output, dead time generation and emergency stop
   – One 16-bit timer, with 2 IC/OC, 1 OCN/PWM, dead-time generation and emergency stop
   – Two 16-bit timers, each with IC/OC/OCN/PWM, dead-time generation and emergency stop
   – 2 watchdog timers (Independent and Window)
   – SysTick timer: 24-bit downcounter
   – Two 16-bit basic timers to drive the DAC
• Up to 8 communications interfaces
   – Up to two I2C interfaces (SMBus/PMBus)
   – Up to 3 USARTs (ISO 7816 interface, LIN, IrDA capability, modem control)
   – Up to 2 SPIs (12 Mbit/s)
   – Consumer electronics control (CEC) interface
• CRC calculation unit, 96-bit unique ID
• ECOPACK® packages