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.

Head Index

Required integer input.

Offset

Required integer input.

Capacity

Required integer input.

Wrap a signed offset around a zero-based circular buffer without changing the stored head index. 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]

Wrapped Index

The resulting wrapped index 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.

• PWM Duty Count

  Nearest PWM active-tick count for a target duty fraction over an inclusive zero-to-period-register timer cycle.

• ADC Code To Voltage

  Ideal unipolar endpoint-inclusive ADC code-to-voltage conversion, where the maximum code maps to Vref.