PAGEPROT1 register
| SEGSIZE2 | Third segment, 7-bit page protection size (number of pages to protect in segment, first page included) | 
| SEGOFFSET2 | Third segment, 7-bit page protection offset (first page number in protected segment) | 
| SEGSIZE3 | Fourth segment, 7-bit page protection size (number of pages to protect in segment, first page included) | 
| SEGOFFSET3 | Fourth segment, 7-bit page protection offset (first page number in protected segment) |