AT90LS2343-4 查看數據表（PDF） - Atmel Corporation

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AT90LS2343-4

8-bit AVR® Microcontroller with 2K Bytes of In-System Programmable Flash

Atmel Corporation 

SRAM Data Memory

AT90S/LS2323/2343

Figure 9 shows how the AT90S2323/2343 Data Memory is organized.

Figure 9. SRAM Organization

Register File

R0

R1

R2

…

Data Address Space

$00

$01

$02

…

R29

$1D

R30

$1E

R31

$1F

I/O Registers

$00

$20

$01

$21

$02

$22

…

…

$3D

$5D

$3E

$5E

$3F

$5F

Internal SRAM

$60

$61

$62

…

$DD

$DE

$DF

The 224 data memory locations address the Register file, I/O memory and the data

SRAM. The first 96 locations address the Register file + I/O memory, and the next 128

locations address the data SRAM.

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 address space.

The Indirect with Displacement mode features 63 address locations reached from the

base address given by the Y- and Z-register.

When using register indirect addressing modes with automatic pre-decrement and post-

increment, the address registers X, Y, and Z are used and decremented and

incremented.

The 32 general-purpose working registers, 64 I/O registers and the 128 bytes of data

SRAM in the AT90S2323/2343 are all directly accessible through all these addressing

modes.

11

1004D–09/01

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