EEPROM wait state register
| PHASE3 | Wait states 3 (minus 1 encoded). The number of system clock periods required to give a minimum time of 15 ns. |
| PHASE2 | Wait states 2 (minus 1 encoded). The number of system clock periods required to give a minimum time of 55 ns. |
| PHASE1 | Wait states 1 (minus 1 encoded). The number of system clock periods required to give a minimum time of 35 ns. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |