Interrupt Register. The IR can be written to clear interrupts. The IR can be read to identify which of eight possible interrupt sources are pending.
| MR0INT | Interrupt flag for match channel 0. |
| MR1INT | Interrupt flag for match channel 1. |
| MR2INT | Interrupt flag for match channel 2. |
| MR3INT | Interrupt flag for match channel 3. |
| CR0INT | Interrupt flag for capture channel 0 event. |
| CR1INT | Interrupt flag for capture channel 1 event. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |