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ATMEGA128-16AU Datasheet(PDF) 13 Page - ATMEL Corporation

Part # ATMEGA128-16AU
Description  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
PDF  386 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA128-16AU Datasheet(HTML) 13 Page - ATMEL Corporation

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13
2467R–AVR–06/08
ATmega128
Figure 4. AVR CPU General Purpose Working Registers
Most of the instructions operating on the Register file have direct access to all registers, and
most of them are single cycle instructions.
As shown in Figure 4, each register is also assigned a data memory address, mapping them
directly into the first 32 locations of the user Data Space. Although not being physically imple-
mented as SRAM locations, this memory organization provides great flexibility in access of the
registers, as the X-, Y-, and Z-pointer Registers can be set to index any register in the file.
X-register, Y-register,
and Z-register
The registers R26..R31 have some added functions to their general purpose usage. These reg-
isters are 16-bit address pointers for indirect addressing of the Data Space. The three indirect
address registers X, Y, and Z are described in Figure 5.
Figure 5. The X-, Y-, and Z-registers
In the different addressing modes these address registers have functions as fixed displacement,
automatic increment, and automatic decrement (see the Instruction Set Reference for details).
7
0
Addr.
R0
$00
R1
$01
R2
$02
R13
$0D
General
R14
$0E
Purpose
R15
$0F
Working
R16
$10
Registers
R17
$11
R26
$1A
X-register Low Byte
R27
$1B
X-register High Byte
R28
$1C
Y-register Low Byte
R29
$1D
Y-register High Byte
R30
$1E
Z-register Low Byte
R31
$1F
Z-register High Byte
15
XH
XL
0
X - register
7
0
7
0
R27 ($1B)
R26 ($1A)
15
YH
YL
0
Y - register
7
0
7
0
R29 ($1D)
R28 ($1C)
15
ZH
ZL
0
Z - register
7
0
7
0
R31 ($1F)
R30 ($1E)


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