Setting Procedure: interrupt controller and peripheral module

To enable interrupt requests, first enable interrupts in the peripheral module, and then enable interrupt requests for the corresponding interrupt request enable bit (IEN) in the interrupt request enable register (IER) in the ICU.

To disable interrupts, with exception of cases where interrupts must be disabled in the peripheral module individually (when multiple sources exist for a single interrupt vector), interrupts can be disabled using only the IEN bit in the IER register in the ICU.