3.3 I/O Direct

Operand address A is contained in the instruction word. Rr/Rd specify the destination or source register.

Note: Some AVR microcontrollers have more peripheral units than can be supported within the 64 locations reserved in the opcode for I/O direct addressing. The extended I/O memory from address 64 and higher can only be reached by data addressing, not I/O addressing.

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