AT90S8414
Preliminary
4-15
The 32 general purpose working registers, the 256 bytes of internal data SRAM, and the 64K bytes of optional external
data SRAM in the AT90S8414 are all accessible through all these addressing modes.
See the next section for a detailed description of the different addressing modes.
The Program and Data Addressing Modes
The AT90S8414
AVR
Enhanced RISC microcontroller supports powerful and efficient addressing modes for access to
the program memory (Flash) and data memory (SRAM). This section describes the different addressing modes supported
by the
AVR
architecture. In the figures, 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 8: Direct Single Register Addressing
The operand is contained in register d (Rd).
REGISTER DIRECT, TWO REGISTERS Rd AND Rr
Figure 9: Direct Register Addressing, Two Registers
Operands are contained in register r (Rr) and d (Rd). The result is stored in register d (Rd).
