11
AT90S2313
0839G–08/01
Program and Data
Addressing Modes
The AT90S2313 AVR RISC microcontroller supports powerful and efficient addressing
modes for access to the program memory (Flash) and data memory. This section
describes the different addressing modes supported by the AVR architecture. In the fig-
ures, OP means the operation code part of the instruction word. To simplify, not all
figures show the exact location of the addressing bits.
Register Direct, Single
Register Rd
Figure 9. Direct Single Register Addressing
The operand is contained in register d (Rd).
Register Direct, Two
Registers Rd and Rr
Figure 10. Direct Register Addressing, Two Registers
Operands are contained in register r (Rr) and d (Rd). The result is stored in register d
(Rd).
I/O Direct Figure 11. I/O Direct Addressing
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