Description:
SPM can be used to erase a page in the program memory, to write a page in the program memory (that is already erased), and to set boot loader lock bits. In some devices, the program memory can be written one word at a time, in other devices an entire page can be programmed simultaneously after first filling a temporary page buffer. In all cases, the program memory must be erased one page at a time. When erasing the program memory, the RAMPZ and Z register are used as page address. When writing the program memory, the RAMPZ and Z register are used as page or word address, and the R1:R0 register pair is used as data. R1 determines the instruction high byte, and R0 determines the instruction low byte... When setting the boot loader lock bits, the R1:R0 register pair is used as data. Refer to the device documentation for detailed description of SPM usage. This instruction can address the entire program memory.
А для xmeg to` более конкретно
The SPM instruction can access the entire flash, including the boot loader section itself. The protection level for the boot loader
section can be selected by the boot loader lock bits. If this section is not used for boot loader software, application code
can be stored here.
Хранение данных в Flash-памяти
Oct 21 2013, 12:55
