AT90LS2343-1PC datasheet(9/64 Pages) ATMEL

9 / 64 page

AT90S/LS2323/2343

1004D–09/01

General-purpose

Figure 7 shows the structure of the 32 general-purpose registers in the CPU.

Figure 7. AVR CPU General-purpose Working Registers

All the register operating instructions in the instruction set have direct and single-cycle

access to all registers. The only exception is the five constant arithmetic and logic

instructions SBCI, SUBI, CPI, ANDI and ORI between a constant and a register and the

LDI instruction for load immediate constant data. These instructions apply to the second

half of the registers in the register file (R16..R31). The general SBC, SUB, CP, AND and

OR and all other operations between two registers or on a single register apply to the

entire register file.

As shown in Figure 7, each register is also assigned a data memory address, mapping

them directly into the first 32 locations of the user Data Space. Although the register file

is not physically implemented as SRAM locations, this memory organization provides

great flexibility in access of the registers, as the X-, Y-, and Z-registers can be set to

index any register in the file.

Addr.

$00

$01

$02

…

R13

$0D

General

R14

$0E

Purpose

R15

$0F

Working

R16

$10

Registers

R17

$11

…

R26

$1A

X-register low byte

R27

$1B

X-register high byte

R28

$1C

Y-register low byte

R29

$1D

Y-register high byte

R30

$1E

Z-register low byte

R31

$1F

Z-register high byte

AT90LS2343-1PC Datasheet(PDF) 9 Page - ATMEL Corporation

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