LAUNCHXL-CC1350: Technical question regarding ISR: Not defined in the reference manual

Part Number: LAUNCHXL-CC1350
Other Parts Discussed in Thread: CC1350

Hi,

I am contacting you in regards to CC13x0, CC26x0 SimpleLink™ Wireless MCU Technical Reference Manual (Rev. I). I am trying to understand what and ISR is. I cannot find any formal definition in the reference manual that is not cyclical. Here is the best thing I could find in the manual:

"Interrupt Service Routines (ISRs): Interrupts (IRQx) are the exceptions handled by ISRs." on page 231.

I would appreciate some clarification regarding this manner.

Best Regards,

Alex Tokar