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3.9.3 HC08 Interrupt Service Routines

Since the number of interrupts available is chip specific and the interrupt vector table always ends at the last byte of memory, the interrupt numbers corresponds to the interrupt vectors in reverse order of address. For example, interrupt 1 will use the interrupt vector at 0xfffc, interrupt 2 will use the interrupt vector at 0xfffa, and so on. However, interrupt 0 (the reset vector at 0xfffe) is not redefinable in this way; instead see section 3.12 for details on customizing startup.