• Operating conditions
  • Operating power supply: 1.8 V to 3.6 V Temperature range: −40 °C to 85 °C
• Low-power features
  • 5 low-power modes: Wait, Low-power run (5.1 μA), Low-power wait (3 μA), Active-halt with RTC (1.3 μA), Halt (350 nA)
  • Ultra-low leakage per I/O: 50 nA
  • Fast wakeup from Halt: 5 μs
• Advanced STM8 core
  • Harvard architecture and 3-stage pipeline
  • Max freq: 16 MHz, 16 CISC MIPS peak
  • Up to 40 external interrupt sources
• Reset and supply management
  • Low power, ultra-safe BOR reset with 5 selectable thresholds
  • Ultra-low power POR/PDR
  • Programmable voltage detector (PVD)
• Clock management
  • 32 kHz and 1 to 16 MHz crystal oscillators
  • Internal 16 MHz factory-trimmed RC
  • Internal 38 kHz low consumption RC
  • Clock security system
• Low-power RTC
  • BCD calendar with alarm interrupt
  • Digital calibration with +/- 0.5 ppm accuracy
  • LSE security system
  • Auto-wakeup from Halt w/ periodic interrupt
• Memories
  • 8 Kbytes of Flash program memory and 256 bytes of data EEPROM with ECC
  • Flexible write and read protection modes
  • 1 Kbyte of RAM

• DMA
  • 4 channels supporting ADC, SPI, I2C, USART, timers
  • 1 channel for memory-to-memory
• 12-bit ADC up to 1 Msps/10 channels
  • Internal reference voltage
• Timers
  • Two 16-bit timers with 2 channels (used as IC, OC, PWM), quadrature encoder
  • One 8-bit timer with 7-bit prescaler
  • 2 watchdogs: 1 Window, 1 Independent
  • Beeper timer with 1, 2 or 4 kHz frequencies
• Communication interfaces
  • Synchronous serial interface (SPI)
  • Fast I2C 400 kHz SMBus and PMBus
  • USART
• Up to 18 I/Os, all mappable on interrupt vectors
• Development support
  • Fast on-chip programming and non-intrusive debugging with SWIM
  • Bootloader using USART

STM8L051F3 as all the value line STM8L ultra-low-power products are based on the same architecture with the same memory mapping and a coherent pinout.