Description
For positive ticks and nominalHz, divide ticks by nominalHz × (1 + relativeTolerance) for minimumSeconds and by nominalHz × (1 - relativeTolerance) for maximumSeconds.
A watchdog refresh window is an interval of allowed elapsed time. Clock tolerance and inclusive endpoints affect whether a nominal refresh time falls inside that interval.
For positive ticks and nominalHz, divide ticks by nominalHz × (1 + relativeTolerance) for minimumSeconds and by nominalHz × (1 - relativeTolerance) for maximumSeconds.
When to use this tool
Use Watchdog Clock Tolerance Interval when you need an explicit watchdog timing window or clock bound.
How to use the tool and how it works
- Enter ticks, nominalHz, relativeTolerance. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read minimumSeconds, maximumSeconds. Use the output convention below.
For positive ticks and nominalHz, divide ticks by nominalHz × (1 + relativeTolerance) for minimumSeconds and by nominalHz × (1 - relativeTolerance) for maximumSeconds.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| ticks | Ticks | Required. Safe integer; minimum 1. |
| nominalHz | Nominal clock frequency in Hz. | Required. Finite number; strictly above 0. |
| relativeTolerance | Dimensionless fractional tolerance; the applicable bound is specified above. | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| minimumSeconds | Minimum Seconds | Required. Finite number. |
| maximumSeconds | Maximum Seconds | Required. Finite number. |
{
"input": {
"ticks": 100,
"nominalHz": 100,
"relativeTolerance": 0
},
"output": {
"minimumSeconds": 1,
"maximumSeconds": 1
}
}Limitations and assumptions
- Tolerance is a fraction in [0, 1), not percent; this bounds a clock-derived interval without startup, quantization, or software latency.
- 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 device datasheet and measured worst-case execution timing before relying on a refresh schedule.
References
Similar or alternative tools
- Watchdog Refresh Window Membership
Mark allowed on the inclusive interval, early below opens, and late above closes.
- Timer Prescale Resolution
Divide positive prescaler by clockHertz for tickSeconds and multiply by nonnegative tickCount for durationSeconds.