ATMEGA168A View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA168A

8-bit Atmel Microcontroller with 4/8/16/32K Bytes In-System Programmable Flash

Atmel Corporation 

ATmega48A/PA/88A/PA/168A/PA/328/P

2. Overview

The ATmega48A/PA/88A/PA/168A/PA/328/P is a low-power CMOS 8-bit microcontroller based

on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock

cycle, the ATmega48A/PA/88A/PA/168A/PA/328/P achieves throughputs approaching 1 MIPS

per MHz allowing the system designer to optimize power consumption versus processing speed.

2.1 Block Diagram

Figure 2-1. Block Diagram

Watchdog

Timer

Watchdog

Oscillator

Oscillator

Circuits /

Clock

Generation

EEPROM

Power

Supervision

POR / BOD &

RESET

Flash

debugWIRE

PROGRAM

LOGIC

SRAM

CPU

8bit T/C 0

8bit T/C 2

16bit T/C 1

Analog

Comp.

2

A/D Conv.

Internal

6

Bandgap

AVCC

AREF

GND

USART 0

SPI

TWI

8271DS–AVR–05/11

PORT D (8)

PORT B (8)

PORT C (7)

PD[0..7]

PB[0..7]

PC[0..6]

ADC[6..7]

RESET

XTAL[1..2]

The AVR core combines a rich instruction set with 32 general purpose working registers. All the

32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent

registers to be accessed in one single instruction executed in one clock cycle. The resulting

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