![]() Interrupt Request by a peripheral, or software request System Service Call when call SVC instruction The Vector Interrupt Table defines different types with priority of handling order as below: Exception Number Whenever an interrupt happens, the processor stops the current code, and handle the interrupt by running an Interrupt Service Routines (ISR) which is located in a pre-defined table called Vector Interrupt Table (VIC). Active and pending The exception is being serviced by the processor and there is a pending exception from the same source Exception types # In this case both exceptions are in the active state. ![]() ![]() Note: An exception handler can interrupt the execution of another exception handler. Active An exception that is being serviced by the processor but has not completed. An interrupt request from a peripheral or from software can change the state of the corresponding interrupt to pending. Pending The exception is waiting to be serviced by the processor. Exception states # Inactive The exception is not active and not pending. Whenever the processor meets an exception or interrupt, the core will stop the application code, change its mode to “Handler mode” to process that event.Ĭortex-M processors have 15 system Exceptions and 240 Interrupts. ![]() The current executing application on a processor can be interrupted by either internal system exception or external interrupt. ![]()
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