Interrupt Vector Table Contents

MVECEN = 0

When MVECEN = 0, the address location pointed to by IVTBASE has a GOTO instruction for a high-priority interrupt. Similarly, the corresponding low-priority vector also has a GOTO instruction, which is executed in case of a low-priority interrupt.

MVECEN = 1

When MVECEN = 1, the value in the vector table of each interrupt points to the address location of the first instruction of the Interrupt Service Routine, hence: ISR Location = Interrupt Vector Table entry << 2.