11.3.1.1 Flash

The Flash is divided into a set of pages. A page is the smallest addressable unit when erasing the Flash. It is only possible to write or erase an entire page at a time. One page consists of 64 bytes.

Independent of page size, the Flash is organized in sections. The Flash is split into two physical sections to optimize the structure for boot loader applications: Read-While-Write (RWW) and No-Read-While-Write (NRWW). It is possible to divide these two sections into three logical sections: Boot Loader Code (BOOT), Application Code (APPCODE), and Application Data (APPDATA).

Figure 11-2. AVR EB Family Flash Sections