Interrupt status register
| LINE0 | Line 0 state bit |
| LINE1 | Line 1 state bit |
| LINE2 | Line 2 state bit |
| LINE3 | Line 3 state bit |
| LINE4 | Line 4 state bit |
| LINE5 | Line 5 state bit |
| LINE6 | Line 6 state bit |
| LINE7 | Line 7 state bit |
| LINE8 | Line 8 state bit |
| LINE9 | Line 9 state bit |
| LINE10 | Line 10 state bit |
| LINE11 | Line 11 state bit |
| LINE12 | Line 12 state bit |
| LINE13 | Line 13 state bit |
| LINE14 | Line 14 state bit |
| LINE15 | Line 15 state bit |
| LINE16 | Line 16 state bit |
| LINE17 | Line 17 state bit |
| LINE18 | Line 18 state bit |
| LINE19 | Line 19 state bit |
| LINE20 | Line 20 state bit |
| LINE21 | Line 21 state bit |
| LINE22 | Line 22 state bit |