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.

Clock Hertz (Hz)

Required number input.

Baud Rate (baud)

Required number input.

Oversampling

Required integer input.

Ideal UART oversampling divider before register quantization from peripheral clock, baud rate and oversampling factor. 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]

Ideal Divider

The resulting ideal divider 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.

• 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.

• I2C Bitrate

  Observed I²C SCL bit rate from measured high and low periods of one complete clock pulse.

• Timer Compare Frequency

  Compare-event rate for an up-counter that resets after an inclusive compare value. Enter the effective prescaler divisor; devices with a PSC register may divide by PSC+1.