AT90LS2323 Ver la hoja de datos (PDF) - Atmel Corporation

Número de pieza

componentes Descripción

Fabricante

AT90LS2323

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

Atmel Corporation 

General-purpose

Register File

AT90S/LS2323/2343

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

Figure 7. AVR CPU General-purpose Working Registers

General

Purpose

Working

Registers

7

0

R0

R1

R2

…

R13

R14

R15

R16

R17

…

R26

R27

R28

R29

R30

R31

Addr.

$00

$01

$02

$0D

$0E

$0F

$10

$11

$1A

$1B

$1C

$1D

$1E

$1F

X-register low byte

X-register high byte

Y-register low byte

Y-register high byte

Z-register low byte

Z-register high byte

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.

9

1004D–09/01

Share Link: