STM32 Clock Tree Calculator

STM32 Clock Tree Calculator

Configure STM32 clock tree: HSE, HSI, PLL, AHB, APB1, APB2 prescalers. Output all bus frequencies.

HSE Input (MHz)

PLL Source

PLLM Divider

PLLN Multiplier

PLLP Divider

AHB Prescaler

Key Formulas

VCO = HSE × PLLN / PLLM (192-432MHz)

SYSCLK = VCO / PLLP (≤168MHz F4)