Datasheet

The device is a complex microcontroller with more peripheral units than can be supported within the 64
locations reserved in the Opcode for the IN and OUT instructions. For the Extended I/O space from 0x60
- 0xFF in SRAM, only the ST/STS/STD and LD/LDS/LDD instructions can be used.
The lower 2304 data memory locations address both the Register File, the I/O memory, Extended I/O
memory, and the internal data SRAM. The first 32 locations address the Register File, the next 64
location the standard I/O memory, then 160 locations of Extended I/O memory, and the next 1/2/4K
locations address the internal data SRAM.
The five different addressing modes for the data memory cover:
• Direct
– The direct addressing reaches the entire data space.
• Indirect with Displacement
– The Indirect with Displacement mode reaches 63 address locations from the base address
given by the Y- or Z-register.
• Indirect
– In the Register File, registers R26 to R31 feature the indirect addressing pointer registers.
• Indirect with Pre-decrement
– The address registers X, Y, and Z are decremented.
• Indirect with Post-increment
– The address registers X, Y, and Z are incremented.
The 32 general purpose working registers, 64 I/O Registers, 160 Extended I/O Registers, and the 1/2/4K
bytes of internal data SRAM in the device are all accessible through all these addressing modes.
Figure 8-4. Data Memory Map with 1024 byte internal data SRAM
(1024x8)
0x04FF
Atmel ATmega16M1/32M1/64M1 [DATASHEET]
Atmel-8209F-ATmega16M1/32M1/64M1_Datasheet_Complete-10/2016
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