ATMEGA323L datasheet(8/247 Pages) ATMEL

Part #	ATMEGA323L

Description	8-bit Microcontroller with 32K Bytes of In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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ATmega323(L)

1457G–AVR–09/03

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

Register File – in one clock cycle.

Six of the 32 registers can be used as three 16-bits 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 look up tables in Flash Program

memory. These added function registers are the 16-bits X-, Y-, and Z-register.

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

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

shows the ATmega323 AVR Enhanced 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 lowest 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 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.

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