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  |