Use this embedded-systems calculation to configure or check a timer, serial bus, ADC, PWM, buffer, power mode, flash budget, or watchdog from known clock and device parameters.

Duty Fraction

Required number input.

Period Register

Required integer input.

Nearest PWM active-tick count for a target duty fraction over an inclusive zero-to-period-register timer cycle. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Active Ticks

The resulting active ticks returned as an integer.

• Register widths, clock trees, prescalers, oscillator tolerance, interrupt latency, peripheral modes, voltage references, quantization, sleep states, endurance conditions, and silicon errata are device-specific.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Confirm equations against the exact datasheet and reference manual, derive register values with integer rounding visible, and verify timing or voltage on hardware.

• Timer Overflow Period

  Overflow interval for a free-running N-bit timer with a zero-based counter. Prescaler is the effective clock divisor, not necessarily the raw register value.

• Timer Tick Period

  Timer tick interval from source clock and the effective prescaler divisor, before rollover or compare logic. If a device uses a PSC register with divisor PSC+1, enter PSC+1.

• PWM Frequency

  Edge-aligned PWM frequency with an inclusive auto-reload value and effective prescaler divisor. On timers whose PSC register divides by PSC+1, enter PSC+1.