ATmega32A Datasheet - Sunrom Technologies

ATmega32AFigure 25-2. Memory Sections (1)Program MemoryBOOTSZ = '11'$0000Program MemoryBOOTSZ = '10'$0000No Read-While-Write Section Read-While-Write SectionNo Read-While-Write Section Read-While-Write SectionApplication Flash SectionApplication Flash SectionBoot Loader Flash SectionProgram MemoryBOOTSZ = '01'Application Flash SectionApplication Flash SectionBoot Loader Flash SectionEnd RWWStart NRWWEnd ApplicationStart Boot LoaderFlashend$0000End RWWStart NRWWEnd ApplicationStart Boot LoaderFlashendNo Read-While-Write Section Read-While-Write SectionNo Read-While-Write Section Read-While-Write SectionApplication Flash SectionApplication Flash SectionBoot Loader Flash SectionProgram MemoryBOOTSZ = '00'Application flash SectionBoot Loader Flash SectionEnd RWWStart NRWWEnd ApplicationStart Boot LoaderFlashend$0000End RWW, End ApplicationStart NRWW, Start Boot LoaderFlashendNote: 1. The parameters in the figure above are given in Table 25-6 on page 263.25.5 Boot Loader Lock BitsIf no Boot Loader capability is needed, the entire Flash is available for application code. TheBoot Loader has two separate sets of Boot Lock bits which can be set independently. This givesthe user a unique flexibility to select different levels of protection.The user can select:• To protect the entire Flash from a software update by the MCU• To protect only the Boot Loader Flash section from a software update by the MCU• To protect only the Application Flash section from a software update by the MCU• Allow software update in the entire FlashSee Table 25-2 and Table 25-3 for further details. The Boot Lock bits can be set in software andin Serial or Parallel Programming mode, but they can be cleared by a Chip Erase commandonly. The general Write Lock (Lock Bit mode 2) does not control the programming of the Flash8155C–AVR–02/11256