STM32F103器件采用Cortex-M3内核，CPU速度达72 MHz。该产品系列具有16KB ~ 1MB Flash、多种控制外设、USB全速接口和CAN。

STM32F103器件介绍:
实时时钟（RTC）精度在大多数嵌入式应用的要求，但由于外部环境–温度变化、频率变化的晶体时钟RTC–RTC精度可能不准确的预期。

RTC嵌入在STM32F101xx和STM32F103xx附带一个数字时钟适用于制造环境校准电路，允许应用程序补偿晶体和温度变化。

本应用笔记讨论了RTC校准和解释了RTC校准可用于提高计时精度。

Key Features

• 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, I2 Cs 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 I2 C 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
• Packages are ECOPACK®

电路原理图