https://test-devzone.nordicsemi.com/f/nordic-q-a/87997/software-interrupt-number-----codeI&#39;m using SEGGER&#39;s SystemView tool to get some insights on my code. I see which interrupt number is activated, and want to figure out which code actually runs. looking at nrf52840.h I can see that ISR20 and ISR22 are software interrupts, but that&#39;sen-USTelligent Community 13 Non-ProductionWed, 18 May 2022 11:10:54 GMThttps://test-devzone.nordicsemi.com/thread/368296?ContentTypeID=1Wed, 18 May 2022 11:10:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:06ca3a27-d33e-47d7-9f37-26993b477b7auser4240<p>Hello,</p> <p>You need to subtract the ISR number by 16 as the numbers listed in the header start at negative 15. Therefore the ISR22 is the same as GPIOTE_IRQn and ISR20 the same as SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1_IRQn.&nbsp;</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>