AT90LS4433 datasheet(7/126 Pages) ATMEL

7 / 126 page

AT90S/LS4433

1042H–AVR–04/03

Architectural

Overview

The fast-access Register File concept contains 32 x 8-bit general purpose working reg-

isters with a single clock cycle access time. This means that during one single clock

cycle, one Arithmetic Logic Unit (ALU) operation is executed. Two operands are output

from the Register File, the operation is executed, and the result is stored back in the

Six of the 32 registers can be used as three 16-bit indirect address register pointers for

Data Space addressing, enabling efficient address calculations. One of the three

address pointers is also used as the address pointer for the constant table look-up func-

tion. These added function registers are the 16-bit X-, Y-, and Z-register.

The ALU supports arithmetic and logic functions between registers or between a con-

stant and a register. Single register operations are also executed in the ALU. Figure 5

shows the AT90S4433 AVR RISC microcontroller architecture.

In addition to the register operation, the conventional Memory Addressing modes can be

used on the Register File as well. This is enabled by the fact that the Register File is

assigned the 32 lowermost Data Space addresses ($00 - $1F), allowing them to be

accessed as though they were ordinary memory locations.

Figure 5. The AT90S4433 AVR RISC Architecture

2K X 16

Program

Memory

Instruction

Decoder

Program

Counter

Control Lines

32 x 8

General

Purpose

Registrers

ALU

Status

and Control

Interrupt

Unit

SPI

Unit

8-bit

Timer/Counter

Watchdog

Timer

Analog to Digital

Converter

Analog

Comparator

I/O Lines

256 x 8

EEPROM

Data Bus 8-bit

Serial

UART

16-bit

Timer/Counter

with PWM

128 x 8

Data

SRAM

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