Rainbow-electronics AT90LS4433 Manuel d'utilisateur télécharger pdf (Page 11)

AT90S/LS4433

1042G–AVR–09/02

In the different addressing modes, these address registers have functions as fixed dis-

placement, automatic increment and decrement (see the descriptions for the different

instructions).

ALU – Arithmetic Logic

Unit

The high-performance AVR ALU operates in direct connection with all the 32 general

purpose working registers. Within a single clock cycle, ALU operations between regis-

ters in the Register File are executed. The ALU operations are divided into three main

categories: arithmetic, logical, and bit functions.

In-System

Programmable Flash

Program Memory

The AT90S4433 contains 4K bytes of On-chip, In-System Programmable Flash memory

for program storage. Since all instructions are 16- or 32-bit words, the Flash is orga-

nized as 2K x 16. The Flash memory has an endurance of at least 1,000 write/erase

cycles. The AT90S4433 Program Counter (PC) is 11 bits wide, thus addressing the

2,048 program memory addresses. See page 93 for a detailed description of Flash data

downloading. See page 12 for the different program memory addressing modes.

Figure 9. SRAM Organization

SRAM Data Memory Figure 9 shows how the AT90S4433 SRAM memory is organized.

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

the internal data SRAM. The first 96 locations address the Register File and I/O mem-

ory, and the next 128 locations address the internal 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.

R0 $0000

R1 $0001

R2 $0002

º º

R29 $001D

R30 $001E

R31 $001F

I/O Registers

$00 $0020

$01 $0021

$02 $0022

……

$3D $005D

$3E $005E

$3F $005F

Internal SRAM

$0060

$0061

$00DE

$00DF

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 124 125

Commentaires sur ces manuels

Pas de commentaire

Rainbow-electronics AT90LS4433 Manuel d'utilisateur Page 11

Commentaires sur ces manuels

Produits connexes et manuels pour Capteurs Rainbow-electronics AT90LS4433