STM32F1 PWM Calculator
Quickly compute the PSC, ARR, and CCR values for STM32F1 timers and generate accurate PWM signals without trial and error. Just select your timer, enter the APB clock, desired PWM frequency, and duty cycle — the calculator instantly provides optimized values along with a ready-to-use configuration for STM32CubeIDE or CubeMX.
This tool is tailored specifically for the STM32F1 series, so keep in mind that timer availability, bus assignments, and clock limits can vary across other STM32 families.
Configuration
Register values
PSC
—
ARR
—
CCR / Pulse
—
Timer clock
—
Actual freq
—
Freq error
—
DC resolution
—
Timer details
Formulas
Timer clk = APB × multiplier
Maximise ARR → best resolution
PSC = ⌊Tclk / (F × (ARR+1))⌋ − 1Maximise ARR → best resolution
CCR = round(ARR × Duty / 100)F_actual = Tclk / ((PSC+1)×(ARR+1))
STM32CubeIDE / HAL snippet
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