Description
Use compareTicks as activeTicks for noninverting polarity or periodTicks - compareTicks for inverting.
Timer formulas depend on whether endpoints are inclusive, the count direction, prescaling, and wrap behavior. A counter reading alone cannot reveal an arbitrary number of elapsed wraps.
Use compareTicks as activeTicks for noninverting polarity or periodTicks - compareTicks for inverting.
When to use this tool
Use Microcontroller: PWM Compare Polarity Crosswalk when you need a timer period, wrap delta, or explicit count-budget term.
How to use the tool and how it works
- Enter periodTicks, compareTicks, polarity. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read result. Expand result to inspect the returned fields.
Use compareTicks as activeTicks for noninverting polarity or periodTicks - compareTicks for inverting. Divide active ticks by the positive period for dutyFraction.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| periodTicks | Period Ticks | Required. Safe integer. |
| compareTicks | Compare Ticks | Required. Safe integer. |
| polarity | Polarity | Required. Text; one of "noninverting", "inverting". Implementation limit: 8192 Unicode code points and 16384 UTF-16 code units. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| result | Result | Required. Object. |
| result.activeTicks | Active Ticks | Calculated result member: number. |
| result.dutyFraction | Duty Fraction | Calculated result member: number. |
{
"input": {
"periodTicks": 10,
"compareTicks": 3,
"polarity": "inverting"
},
"output": {
"result": {
"activeTicks": 7,
"dutyFraction": 0.7
}
}
}Limitations and assumptions
- This ideal ratio omits endpoint special cases, dead time, and hardware-specific PWM behavior.
- Outputs are nested inside result. Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Check the timer mode and register semantics in the device documentation, including synchronization and latency.
References
Similar or alternative tools
- PWM Edge Center Aligned Resolution
Return edgeTicks as periodTicks or twice periodTicks for center alignment.
- Microcontroller: Timer Counter Inclusive Period
Count top + 1 ticks for a counter visiting zero through top inclusively.