Meaning
Memory structures containing the execution addresses of exception handlers dictate how a processor responds to external hardware triggers or internal software faults. This array of pointers, designated as the interrupt vector table, links specific interrupt lines directly to their corresponding service routines. Microcontroller systems read this structure at boot time to establish the basic runtime environment.
Memory Allocation
System architects place the pointers in a dedicated region of non-volatile memory or map them to the start of the RAM block. Dynamic systems can adjust the interrupt vector table during execution to allow different device drivers to handle events as peripheral states change. This flexibility allows the system to prioritize critical communication tasks over routine logging procedures.
Execution Sequence
Hardware-level events trigger an immediate save of the current processor registers before loading the target handler address. The cpu reads the active slot within the interrupt vector table and jumps directly to the indicated subroutine.
Diagnostic Validation
Firmware validation procedures test the integrity of the pointer array to prevent unpredictable system jumps during high-voltage noise spikes. Automated tests verify that every entry in the interrupt vector table points to a valid handler instead of an unmapped memory area.
