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ATMEGA128 Datasheet

8-bit Atmel Microcontroller

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ATMEGA128 pdf
ATmega128
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 4096bytes of internal data
SRAM in the ATmega128 are all accessible through all these addressing modes. The Register
file is described in “General Purpose Register File” on page 11.
Figure 9. Data Memory Map
Memory Configuration A
Memory Configuration B
Data Memory
32 Registers
64 I/O Registers
160 Ext I/O Reg.
Internal SRAM
(4096 x 8)
$0000 - $001F
$0020 - $005F
$0060 - $00FF
$0100
$10FF
$1100
External SRAM
(0 - 64K x 8)
Data Memory
32 Registers
64 I/O Registers
Internal SRAM
(4000 x 8)
$0000 - $001F
$0020 - $005F
$0060
$0FFF
$1000
External SRAM
(0 - 64K x 8)
$FFFF
$FFFF
2467X–AVR–06/11
19
ATMEL Corporation
ATMEL Corporation


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