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> Clock & USB Calculator > Timer & PWM Calculator > ADC Calculator > Communication Timings (UART/SPI/I2C/CAN) > Memory Map Visualizer > CubeMX Utilities

timer pwm calculator

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Timer Registers (TIMx)

APB Timer Clock [MHz]

Prescaler (PSC)

Physical prescaler = PSC + 1 = 84

Auto-Reload Register (ARR)

PWM Resolution = 1000 steps

Capture/Compare (CCR) - for PWM

Parameter Results

Timer Tick Frequency

1,000,000 Hz

Single tick resolution: 1.00 µs

Update Event Interrupt / PWM Frequency

1,000 Hz

Duration (Period): 1.0000 ms

PWM Duty Cycle

25.10 %

📖 STM32 Timer & PWM Calculator

Generating time interrupts and PWM is the most common task in STM32. Hardware timers require values reduced by 1 (since they count from zero). The calculator accepts exact values as you would write them to registers in C code, and visualizes the actual impact on the hardware.

Prescaler (PSC): Divides the main APB bus clock (e.g., 84 MHz / 84 = 1 MHz tick). If you write `83` in the code, the prescaler is 84.
ARR (Auto-Reload): Defines the moment the timer resets. `ARR=999` gives exactly 1000 steps for a full period (great for PWM).
CCR (Capture/Compare): Decides the duration of the high state in PWM mode. Changing CCR continuously modulates the duty cycle without changing the MCU frequency.