Atmel ATmega8

Features
• High-performance, Low-power Atmel
®
AVR
®
8-bit Microcontroller
• Advanced RISC Architecture
– 130 Powerful Instructions – Most Single-clock Cycle Execution
– 32 × 8 General Purpose Working Registers
– Fully Static Operation
– Up to 16MIPS Throughput at 16MHz
– On-chip 2-cycle Multiplier
• High Endurance Non-volatile Memory segments
– 8Kbytes of In-System Self-programmable Flash program memory
– 512Bytes EEPROM
– 1Kbyte Internal SRAM
– Write/Erase Cycles: 10,000 Flash/100,000 EEPROM
– Data retention: 20 years at 85°C/100 years at 25°C
(1)
– Optional Boot Code Section with Independent Lock Bits
In-System Programming by On-chip Boot Program
True Read-While-Write Operation
– Programming Lock for Software Security
• Peripheral Features
– Two 8-bit Timer/Counters with Separate Prescaler, one Compare Mode
– One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture
Mode
– Real Time Counter with Separate Oscillator
– Three PWM Channels
– 8-channel ADC in TQFP and QFN/MLF package
Eight Channels 10-bit Accuracy
– 6-channel ADC in PDIP package
Six Channels 10-bit Accuracy
– Byte-oriented Two-wire Serial Interface
– Programmable Serial USART
– Master/Slave SPI Serial Interface
– Programmable Watchdog Timer with Separate On-chip Oscillator
– On-chip Analog Comparator
• Special Microcontroller Features
– Power-on Reset and Programmable Brown-out Detection
– Internal Calibrated RC Oscillator
– External and Internal Interrupt Sources
– Five Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, and
Standby
• I/O and Packages
– 23 Programmable I/O Lines
– 28-lead PDIP, 32-lead TQFP, and 32-pad QFN/MLF
• Operating Voltages
– 2.7V - 5.5V (ATmega8L)
– 4.5V - 5.5V (ATmega8)
• Speed Grades
– 0 - 8MHz (ATmega8L)
– 0 - 16MHz (ATmega8)
• Power Consumption at 4Mhz, 3V, 25C
– Active: 3.6mA
– Idle Mode: 1.0mA
– Power-down Mode: 0.5µA
8-bit Atmel with
8KBytes In-
System
Programmable
Flash
ATmega8
ATmega8L
Summary
Rev.2486AAS–AVR–02/2013

Atmel ATmega8 Specifications

General

Brand	Atmel
Model	ATmega8
Category	Microcontrollers
Language	English

Summary

Features

Advanced RISC Architecture

Core architecture details, instruction set, registers, and throughput.

Non-volatile Memory Features

Flash, EEPROM, SRAM, endurance, data retention, and programming locks.

Peripheral Capabilities

Timers, PWM channels, ADC, serial interfaces, and watchdog timer.

Operational Features

Reset, brown-out detection, oscillator, and sleep modes.

Power and Performance

Operating voltages, speed grades, and power consumption details.

Pin Configurations

PDIP Package Pinout

Pin assignments and numbering for the PDIP package.

TQFP Package Pinout

Pin assignments and numbering for the TQFP package.

MLF Package Pinout

Pin assignments and numbering for the MLF package.

Overview

Block Diagram

Disclaimer

Pin Descriptions

Power, Ground, and Reset Pins

Descriptions of VCC, GND, and Reset pins functionality.

General Purpose IO Port Descriptions

Details on Port B, C, and D pins, bi-directional I/O, pull-ups.

Ordering Information

Ordering Codes and Packages

Mapping of speed, voltage, ordering codes, and package types.

Package Type Definitions

Descriptions of package types like TQFP, PDIP, and QFN/MLF.

Packaging Information - 32 A

Packaging Information - 28 P3

Packaging Information - 32 M1-A

Errata

Analog Comparator Delay Issue

First Analog Comparator conversion may be delayed.

Timer Interrupt Loss Issue

Interrupts may be lost when writing timer registers.

Signature Erasure in Programming Mode

Signature may be erased when programming.

CKOPT Fuse and Oscillator Issue

CKOPT may not enable internal capacitors with 32KHz oscillator.

EEPROM Read Interrupt Issue

Reading EEPROM triggers an unexpected interrupt.