EXTI software interrupt event register
| SWI0 | Software interrupt on event x |
| SWI1 | Software interrupt on event x |
| SWI2 | Software interrupt on event x |
| SWI3 | Software interrupt on event x |
| SWI4 | Software interrupt on event x |
| SWI5 | Software interrupt on event x |
| SWI6 | Software interrupt on event x |
| SWI7 | Software interrupt on event x |
| SWI8 | Software interrupt on event x |
| SWI9 | Software interrupt on event x |
| SWI10 | Software interrupt on event x |
| SWI11 | Software interrupt on event x |
| SWI12 | Software interrupt on event x |
| SWI13 | Software interrupt on event x |
| SWI14 | Software interrupt on event x |
| SWI15 | Software interrupt on event x |
| SWI16 | Software interrupt on event x |
| SWI21 | Software interrupt on event x |
| SWI22 | Software interrupt on event x |