Write to enable interrupts.
| SW0 | Software Interrupt Enable |
| SW1 | Software Interrupt Enable |
| SW2 | Software Interrupt Enable |
| SW3 | Software Interrupt Enable |
| FPIOC | FPU Invalid Operation Interrupt Enable |
| FPDZC | FPU Divide by zero Interrupt Enable |
| FPUFC | FPU Underflow Interrupt Enable |
| FPOFC | FPU Overflow Interrupt Enable |
| FPIDC | FPU Input denormal Interrupt Enable |
| FPIXC | FPU Inexact Interrupt Enable |
| SEQRAMERR1B | SEQRAM Error 1-bit Interrupt Enable |
| SEQRAMERR2B | SEQRAM Error 2-bit Interrupt Enable |
| FRCRAMERR1B | FRCRAM Error 1-bit Interrupt Enable |
| FRCRAMERR2B | FRCRAM Error 2-bit Interrupt Enable |