26.4.2.2.1 Program Flash Memory

The Program Flash Memory section can be divided into two logical sections, in blocks of a configured number of bytes, for different security. The two sections are Boot Code (BOOT) and Application Code (APPCODE).

The sizes of these sections are set by the Boot Section End fuse, which can be read back in the Boot Section Size bit field in the NVM Parameters register (PARAM.BOOTPROT). See PARAM.BOOTPROT for the full configuration list.

Figure 26-2. NVM Memory Address Space

The BOOT section extends from the start of the Flash until BOOTEND. The APPCODE section runs from BOOTEND to FLASHEND. If PARAM.BOOTPROT is read as 0, the entire Flash is regarded as the APPCODE section.