27.3.2.1 Checksum
The pre-calculated checksum must be present in the last location of the section to be checked. If the BOOT section should be checked, the 16-bit checksum must be saved in the last two bytes of the BOOT section, and similarly for APPLICATION and entire Flash. Table 27-2 shows explicitly how the checksum should be stored for the different sections. Also see CTRLB27.5.2 Control B for how to configure which section to check and the device fuse description for how to configure the BOOTEND and APPEND fuses.
| Section to Check | CHECKSUM[15:8] | CHECKSUM[7:0] |
|---|---|---|
| BOOT | FUSE_BOOTEND*256-2 | FUSE_BOOTEND*256-1 |
| BOOT and APPLICATION | FUSE_APPEND*256-2 | FUSE_APPEND*256-1 |
| Full Flash | FLASHEND-1 | FLASHEND |