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Handling these interrupts is the responsibility of the Vectored Interrupt Controller, or VIC. The VIC is implemented based on an IP block also licensed from ARM – these standard IP blocks are known as PrimeCells and are commonly found in many vendors’ implementations of ARM cores. The VIC has 32 IRQs, where 16 of them can be auto vectored. This class of interrupts, known as Fast Interrupts, are a higher priority of interrupts for the core to respond to. Note that in the LPC2300 and LPC2400, an advanced VIC has been implemented allowing for a full 32 fast interrupts!
PTM Published on: 2011-11-02
