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AT90LS2323

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

Atmel Corporation 

Architectural

Overview

1004D–09/01

AT90S/LS2323/2343

The fast-access register file concept contains 32 x 8-bit general-purpose working regis-

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

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

the register file, the operation is executed and the result is stored back in the register file

– in one clock cycle.

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.

Figure 5. The AT90S2323/2343 AVR RISC Architecture

1K x 16

Program

Flash

Instruction

Register

Instruction

Decoder

Control Lines

Program

Counter

Data Bus 8-bit

Status

and Test

32 x 8

General

Purpose

Registers

ALU

Control

Registers

Interrupt

Unit

SPI

Unit

8-bit

Timer/Counter

Watchdog

Timer

128 x 8

Data

SRAM

I/O Lines

128 x 8

EEPROM

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 AT90S2323/2343 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.

The I/O memory space contains 64 addresses for CPU peripheral functions such as

Control Registers, Timer/Counters, A/D converters and other I/O functions. The I/O

memory can be accessed directly or as the Data Space locations following those of the

register file, $20 - $5F.

7

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