ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 18
ATMEga64L
Manufacturer Part Number
ATMEga64L
Description
8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATMEGA64L.pdf
(363 pages)
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18
ATmega64(L)
The five different addressing modes for the data memory cover: Direct, Indirect with Dis-
placement, Indirect, Indirect with Pre-decrement, and Indirect with Post-increment. In
the Register File, registers R26 to R31 feature the indirect addressing pointer registers.
The direct addressing reaches the entire data space.
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-
increment, the address registers X, Y, and Z are decremented or incremented.
The 32 general purpose working registers, 64 I/O Registers, 160 extended I/O Regis-
ters, and the 4,096 bytes of internal data SRAM in the ATmega64 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
160 Ext I/O Reg.
64 I/O Registers
External SRAM
Internal SRAM
Data Memory
32 Registers
(0 - 64K x 8)
(4096 x 8)
$0000 - $001F
$0100
$10FF
$1100
$FFFF
$0020 - $005F
$0060 - $00FF
Memory Configuration B
64 I/O Registers
External SRAM
Internal SRAM
Data Memory
32 Registers
(0 - 64K x 8)
(4000 x 8)
$0FFF
$1000
$0000 - $001F
$0020 - $005F
$0060
$FFFF
2490G–AVR–03/04
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