AT90LS2323-4SC datasheet(11/64 Pages) ATMEL

11 / 64 page

AT90S/LS2323/2343

1004D–09/01

SRAM Data Memory

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

Figure 9. SRAM Organization

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

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.

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

AT90LS2323-4SC Datasheet(PDF) 11 Page - ATMEL Corporation

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