ATmega128 datasheet(20/386 Pages) ATMEL

Teilenummer	ATmega128

Bauteilbeschribung	8-bit Microcontroller with 128K Bytes In-System Programmable Flash

PDF	386 Pages

Scroll/Zoom	100%

Hersteller	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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20 / 386 page

2467S–AVR–07/09

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 “General Purpose Register File” on page 12.

Figure 9. Data Memory Map

Memory Configuration B

32 Registers

64 I/O Registers

Internal SRAM

(4000 x 8)

$0000 - $001F

$0020 - $005F

$1000

$0FFF

$FFFF

$0060

Data Memory

External SRAM

(0 - 64K x 8)

Memory Configuration A

32 Registers

64 I/O Registers

Internal SRAM

(4096 x 8)

$0000 - $001F

$0020 - $005F

$1100

$10FF

$FFFF

$0060 - $00FF

Data Memory

External SRAM

(0 - 64K x 8)

160 Ext I/O Reg.

$0100

ATmega128 Datenblatt(PDF) 20 Page - ATMEL Corporation