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The __farflash extended keyword places objects in flash (code) memory.
Note that it is preferred do declare flash objects as const.
The __farflash keyword is only available for AVR chips with at
least 64 Kbytes of flash memory. The index type uses 16-bit arithmetic,
which implies that a 64 Kbyte boundary cannot be crossed.
Note: When the __farflash keyword is used, objects cannot cross a 64 Kbyte
boundary. Arithmetics will only be performed on the two lower bytes, except
comparison which is always performed on the entire 24-bit address.
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