Write to enable interrupts.
| SW0 | Software interrupt 0 | 
| SW1 | Software interrupt 1 | 
| SW2 | Software interrupt 2 | 
| SW3 | Software interrupt 3 | 
| RAMERR1B | RAM 1-bit Error Interrupt Enable | 
| RAMERR2B | RAM 2-bit Error Interrupt Enable | 
| SEQRAMERR1B | SEQRAM 1-bit Error Interrupt Enable | 
| SEQRAMERR2B | SEQRAM 2-bit Error Interrupt Enable | 
| FRCRAMERR1B | FRCRAM 1-bit Error Interrupt Enable | 
| FRCRAMERR2B | FRCRAM 2-bit Error Interrupt Enable |