STM32 SDK Terms

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RCC

  • HSI internal high speed crystal
  • HSE external high speed crystal
  • LSE external low speed crystal, 32.768Khz
  • HSE = High-speed external clock signal
  • HSI = High-speed internal clock signal
  • LSI = Low-speed internal clock signal
  • LSE = Low-speed external clock signal
  • MSI = Multispeed internal clock signal


  • clock source (SYSCLKS)
  • PCLK1 low speed / The APB1 clock (PCLK1) = APB low-speed clock (PCLK1)
  • PCLK2 high speed / The APB2 clock (PCLK2) = APB highspeed clock (PCLK2)
  • AHB clock (HCLK)

reference