ATMEGA8-16AI SL383 Atmel, ATMEGA8-16AI SL383 Datasheet - Page 18
ATMEGA8-16AI SL383
Manufacturer Part Number
ATMEGA8-16AI SL383
Description
Semiconductors and Actives, Microprocessors, Microcontrollers
Manufacturer
Atmel
Datasheet
1.ATMEGA8-16AI_SL383.pdf
(310 pages)
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SRAM Data
Memory
18
ATmega8(L)
Figure 8
The lower 1120 Data memory locations address the Register File, the I/O Memory, and the inter-
nal data SRAM. The first 96 locations address the Register File and I/O Memory, and the next
1024 locations address the internal data SRAM.
The five different addressing modes for the Data memory cover: Direct, Indirect with Displace-
ment, Indirect, Indirect with Pre-decrement, and Indirect with Post-increment. In the Register
File, registers R26 to R31 feature the indirect addressing pointer registers.
The direct addressing reaches the entire data space.
The Indirect with Displacement mode reaches 63 address locations from the base address given
by the Y- or Z-register.
When using register indirect addressing modes with automatic pre-decrement and post-incre-
ment, the address registers X, Y and Z are decremented or incremented.
The 32 general purpose working registers, 64 I/O Registers, and the 1024 bytes of internal data
SRAM in the ATmega8 are all accessible through all these addressing modes. The Register File
is described in
Figure 8. Data Memory Map
shows how the ATmega8 SRAM Memory is organized.
I/O Registers
Register File
“General Purpose Register File” on page
R29
R30
R31
$3D
$3E
$00
$01
$02
$3F
R0
R1
R2
...
...
12.
Data Address Space
Internal SRAM
$001D
$005D
$001E
$005E
$005F
$045E
$045F
$0000
$0001
$0002
$001F
$0020
$0021
$0022
$0060
$0061
...
...
...
2486W–AVR–02/10
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