Application Code Section End
These bits set the
end of the application code section in blocks of 256 bytes. The end of the
application code section should be set as BOOT size + application code size. The
remaining Flash will be application data. A value of 0x00 defines the Flash from
BOOTEND*256 to end of Flash as application code. When both FUSE.APPEND and
FUSE.BOOTEND are 0x00, the entire Flash is BOOT section.