Transcription of Measuring Interrupt Latency - NXP
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Measuring Interrupt Latency - NXP
NXP Semiconductors Document Number: AN12078. Application Note Rev. 1, 04/2018. Measuring Interrupt Latency 1. Introduction Contents The term Interrupt Latency refers to the delay between the start 1. Introduction .. 1. 2. Cause of Interrupt Latency .. 2. of an Interrupt Request (IRQ) and the start of the respective 3. RT1050 introduction .. 3. Interrupt Service Routine (ISR). The Interrupt Latency is 4. Arm Cortex-M Interrupt 3. expressed in core clock cycles. There is another exact 5. Measuring Interrupt Latency .. 4. Timer Interrupt 4. definition-the number of clock cycles from the assertion of the Timer Interrupt waking an RTOS task Latency .. 6. Interrupt request to the first ISR instruction executed, as shown GPIO Interrupt Latency .. 8. in Figure 1. 6. Conclusion .. 10. 7. Revision history .. 10. When the clock frequency is known, the Interrupt Latency is also expressed in terms of time (us or ns).
of an Interrupt Request (IRQ) and the start of the respective Interrupt Service Routine (ISR). The interrupt latency is expressed in core clock cycles. 5.There is another exact definition-the number of clock cycles from the assertion of the interrupt request to the first ISR instruction executed, as shown in Figure 6.1. Conclusion
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