ATMEGA128-16AU SL383 Atmel, ATMEGA128-16AU SL383 Datasheet - Page 20

• Manufacturer Part Number: ATMEGA128-16AU SL383
• Manufacturer: Atmel

20
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 4096 bytes of internal data
SRAM in the ATmega128 are all accessible through all these addressing modes. The Register
file is described in
Figure 9. Data Memory Map
Memory Configuration A
“General Purpose Register File” on page
64 I/O Registers
160 Ext I/O Reg.
External SRAM
Internal SRAM
Data Memory
32 Registers
(0 - 64K x 8)
(4096 x 8)
$10FF
$1100
$0000 - $001F
$0020 - $005F
$0060 - $00FF
$0100
$FFFF
Memory Configuration B
64 I/O Registers
External SRAM
Internal SRAM
Data Memory
32 Registers
(0 - 64K x 8)
(4000 x 8)
12.
$1000
$0000 - $001F
$0020 - $005F
$0060
$0FFF
$FFFF
2467S–AVR–07/09