The load value for interrupts every one milliseconds is
The load value for interrupts every millisecond is
However, we can only load integer values, therefore we apply
When the delay is 1 ms, it is accurate, but when the delay is 1 us, it is a little bit less. We are unable to provide an accurate 1 us delay interrupt because this requires a fractional value was calculated.
<h3>What does a SysTick timer do?</h3>- The systick timer has an auto reload and a 24-bit countdown timer.
- An RTOS scheduler typically uses it to provide a periodic interrupt.
- The Cortex-M CPU clock is used as the default clock source for the systick timer.
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