Description
Use 2 × top ticks for an up/down cycle and multiply by prescaler / clockHz for periodSeconds.
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 2 × top ticks for an up/down cycle and multiply by prescaler / clockHz for periodSeconds.
When to use this tool
Use Timer Up Down Counter Turnaround Period when you need a timer period, wrap delta, or explicit count-budget term.
How to use the tool and how it works
- Enter top, clockHz, prescaler. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read ticks, periodSeconds. Use the output convention below.
Use 2 × top ticks for an up/down cycle and multiply by prescaler / clockHz for periodSeconds. Top and prescaler are positive integers.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| top | Top | Required. Safe integer; minimum 1; maximum 1000000000. |
| clockHz | Clock frequency in cycles per second (Hz). | Required. Finite number; strictly above 0. |
| prescaler | Prescaler | Required. Safe integer; minimum 1; maximum 1000000. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| ticks | Ticks | Required. Safe integer. |
| periodSeconds | Period Seconds | Required. Finite number. |
{
"input": {
"top": 100,
"clockHz": 1000,
"prescaler": 1
},
"output": {
"ticks": 200,
"periodSeconds": 0.2
}
}Limitations and assumptions
- This assumes turnaround endpoints are not counted twice; device-specific update events and counter modes are not inferred.
- 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
- Microcontroller: Timer Counter Inclusive Period
Count top + 1 ticks for a counter visiting zero through top inclusively.
- PWM Edge Center Aligned Resolution
Return edgeTicks as periodTicks or twice periodTicks for center alignment.