External Interrupt Factor Register
| ER0 | External interrupt Ch.0 request detection bit |
| ER1 | External interrupt Ch.1 request detection bit |
| ER2 | External interrupt Ch.2 request detection bit |
| ER3 | External interrupt Ch.3 request detection bit |
| ER4 | External interrupt Ch.4 request detection bit |
| ER5 | External interrupt Ch.5 request detection bit |
| ER6 | External interrupt Ch.6 request detection bit |
| ER7 | External interrupt Ch.7 request detection bit |
| ER8 | External interrupt Ch.8 request detection bit |
| ER9 | External interrupt Ch.9 request detection bit |
| ER10 | External interrupt Ch.10 request detection bit |
| ER11 | External interrupt Ch.11 request detection bit |
| ER12 | External interrupt Ch.12 request detection bit |
| ER13 | External interrupt Ch.13 request detection bit |
| ER14 | External interrupt Ch.14 request detection bit |
| ER15 | External interrupt Ch.15 request detection bit |
| ER16 | External interrupt Ch.16 request detection bit |
| ER17 | External interrupt Ch.17 request detection bit |
| ER18 | External interrupt Ch.18 request detection bit |
| ER19 | External interrupt Ch.19 request detection bit |
| ER20 | External interrupt Ch.20 request detection bit |
| ER21 | External interrupt Ch.21 request detection bit |
| ER22 | External interrupt Ch.22 request detection bit |
| ER23 | External interrupt Ch.23 request detection bit |
| ER24 | External interrupt Ch.24 request detection bit |
| ER25 | External interrupt Ch.25 request detection bit |
| ER26 | External interrupt Ch.26 request detection bit |
| ER27 | External interrupt Ch.27 request detection bit |
| ER28 | External interrupt Ch.28 request detection bit |
| ER29 | External interrupt Ch.29 request detection bit |
| ER30 | External interrupt Ch.30 request detection bit |
| ER31 | External interrupt Ch.31 request detection bit |