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The generic interrupt vector table is available in table 2-1 of the family reference manual, while device specific vectors are defined in table 5 of the datasheet.
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In this lesson, we will learn about the different types of interrupts, their attributes, how to implement them, what happens when an interrupt fires, and how they are used in real world applications. Interrupts have attributes that may or may be programmable, depending on the architecture and the device. Taking too long in the ISR can result in lost data or events. In operating system environments, interrupt handlers may operate on a separate stack which is much smaller than a typical process or thread stack. They must also be efficient with the stack.
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Interrupt service routines must be as quick and efficient as possible, so as to not stall the software which was executing. These functions are called interrupt service routines (ISR), and though some may be included as part of the compiler libraries, most need to be implemented by the programmer. Each event has an entry in what is called the interrupt vector table – a table of pointers to functions stored in memory (either flash or RAM), which the CPU will jump to automatically when the interrupt fires. So what are interrupts? They are really just a way for the hardware to signal the software that some event has occurred. Interrupts are sometimes neglected because its ‘easier’ to poll than implement interrupts but its generally considered poor design. Every CPU has interrupt capabilities, although the capabilities vary widely. They are the source for all types of timers and ticks and integrated into most peripherals. If interrupts didn’t exist, your electronic devices wouldn’t be as responsive, fast and efficient as they are. After much anticipation, we have finally got to the topic that I keep on mentioning, but never explain – interrupts! Interrupts are probably the single most important concept that make every electronic device work as it does.