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Feb 2, 2023 · Interrupt latency is the time that elapses between the occurrence of an interrupt and the execution of the first instruction of the interrupt service routine (ISR) that handles the interrupt. It is a measure of the system’s ability to respond to external events in a timely manner.
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Introduction. The term interrupt latency refers to the delay between the start of an Interrupt Request (IRQ) and the start of the respective Interrupt Service Routine (ISR). The interrupt latency is expressed in core clock cycles.
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Jul 31, 2011 · You need to somehow take a timestamp at the time the interrupt reaches the processor and then another timestamp at the very beginning of the interrupt handler. An approximation of the interrupt latency can be calculated by subtracting the two.
Interrupt Latency is defined to be the time between the actual interrupt request (IRQ) signal and the CPU starting to execute the first instruction of the (ISR) interrupt handler function. And it’s usually expressed in CPU clock cycles or time (in μs or ns).
Jun 1, 2001 · In simple cases, latency can be calculated from instruction times, but many modern systems with 32-bit CPUs, caches, and multiple interrupt sources, are far too complex for exact latency calculations.
Interrupt latency is the interval of time from an external interrupt request signal being raised to the first fetch of an instruction of a specific interrupt service routine (ISR).
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Apr 1, 2016 · The interrupt latency of Cortex-M processors can be affected by wait states of the on chip bus system, which can result in a small jitter. The Cortex-M0 and Cortex-M0+ processors have an optional feature to force interrupt response time to have zero jitter.