Interrupt Vector Table

• When the system is booted up or reseted, the interrupt is disabled because interrupt mechanism is not initialized.
• Therefore, after booting up, one important task is to initialize interrupt mechanism. For all system, we need to setup ISR's address.
• Typically, ISR's addresses are stored in interrupt vector table, and each device is assigned a specific number as the index to the interrupt vector table for accessing their corresponding ISR (however, some architectures are slightly different, such as ARM).
• The number assigned to each device are system dependent (ex. for lpc2103… not processor dependent).
• Interrupt vector table (its address, and so on) is processor dependent.