Interrupts & Interrupt Service Routines

How hardware interrupts preempt normal execution, and the discipline required to write an ISR that doesn't corrupt shared state or blow the interrupt budget.

Read

55 min

Practice MCQs

25

Interview QA

25

Edition

v3

Editorial status

Reviewed

Relevant for

Embedded Systems Engineer

Scope: CMSIS-Core 6.2 interrupt APIs; current FreeRTOS Cortex-M port guidance; current GCC interrupt attributes and Arm ABI reviewed 2026-09-04.