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Interrupt Vectors and
Relative Jumps/Calls
The ATmega8535 uses 1-word Interrupt Vectors while the ATmega16 uses 2-word
Interrupt Vectors. 1-word Vectors can only contain RJMP instructions, which can not
reach the entire 8k word memory range of ATmega16.
Since RJMP/RCALL can only jump 2k words in any direction, it wraps around the start
or end of the 4k word Flash of the ATmega8535 to reach the entire memory span. Wrap-ping
RJMP/RCALLs must be changed Fuse High Byte
Fuse Low
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