PROTECT=0, KEY=others
Stack Pointer Monitor Protection Register
| PROTECT | Protection of register 0 (0): Stack pointer monitor register writes are permitted 1 (1): Stack pointer monitor register writes are protected. Reads are permitted. |
| Reserved | These bits are read as 0000000. The write value should be 0000000. |
| KEY | Key Code Write data is not saved. 0 (others): Writing to the PROTECT bit is invalid. 165 (0xA5): Writing to the PROTECT bit is valid, when the KEY bits are written 0xA5. |