參數(shù)資料
型號(hào)： MD83C154CXXX-16/883D
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40
封裝： 0.600 INCH, CERAMIC, DIP-40
文件頁(yè)數(shù)： 4/28頁(yè)
文件大小： 6193K
代理商： MD83C154CXXX-16/883D
12
2467X–AVR–06/11
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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