External Interrupt Enable Register
| EN0 | External interrupt Ch.0 enable bit |
| EN1 | External interrupt Ch.1 enable bit |
| EN2 | External interrupt Ch.2 enable bit |
| EN3 | External interrupt Ch.3 enable bit |
| EN4 | External interrupt Ch.4 enable bit |
| EN5 | External interrupt Ch.5 enable bit |
| EN6 | External interrupt Ch.6 enable bit |
| EN7 | External interrupt Ch.7 enable bit |
| EN8 | External interrupt Ch.8 enable bit |
| EN9 | External interrupt Ch.9 enable bit |
| EN10 | External interrupt Ch.10 enable bit |
| EN11 | External interrupt Ch.11 enable bit |
| EN12 | External interrupt Ch.12 enable bit |
| EN13 | External interrupt Ch.13 enable bit |
| EN14 | External interrupt Ch.14 enable bit |
| EN15 | External interrupt Ch.15 enable bit |
| EN16 | External interrupt Ch.16 enable bit |
| EN17 | External interrupt Ch.17 enable bit |
| EN18 | External interrupt Ch.18 enable bit |
| EN19 | External interrupt Ch.19 enable bit |
| EN20 | External interrupt Ch.20 enable bit |
| EN21 | External interrupt Ch.21 enable bit |
| EN22 | External interrupt Ch.22 enable bit |
| EN23 | External interrupt Ch.23 enable bit |
| EN24 | External interrupt Ch.24 enable bit |
| EN25 | External interrupt Ch.25 enable bit |
| EN26 | External interrupt Ch.26 enable bit |
| EN27 | External interrupt Ch.27 enable bit |
| EN28 | External interrupt Ch.28 enable bit |
| EN29 | External interrupt Ch.29 enable bit |
| EN30 | External interrupt Ch.30 enable bit |
| EN31 | External interrupt Ch.31 enable bit |