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.

Frame Count

Required integer input.

Bits Per Frame

Required number input.

Clock Hertz (Hz)

Required number input.

Ideal SPI clocking time for fixed-length frames, excluding chip-select setup, inter-frame delays and software overhead. 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]

Transfer Seconds (s)

The resulting transfer seconds returned as a number.

• 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.

• UART Frame Bits

  Bits on the wire per UART character from start, data, optional parity and stop bit counts; excludes idle time.

• ADC Code To Voltage

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

• Sleep Average Current

  Time-weighted average current of one active/sleep cycle; peripheral leakage outside these measured currents is not inferred.