Datasheet

Note:
1. Z[15]: always ignored. Z0: should be zero for all SPM commands, byte select for the LPM
instruction.
See Addressing the Flash During Self-Programming for details about the use of Z-pointer during
Self- Programming.
31.9 Register Description
ATmega328PB
BTLDR - Boot Loader Support – Read-While-Wri...
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Datasheet Complete
DS40001906C-page 381