8-bit with 8K Bytes In-System Programmable Flash

ATmega8 ATmega8L

Features

• High-performance, Low-power AVR® 8-bit Microcontroller

• Advanced RISC Architecture

  – 130 Powerful Instructions

  – Most Single-clock Cycle Execution

  – 32 x 8 General Purpose Working Registers

  – Fully Static Operation

  – Up to 16 MIPS Throughput at 16 MHz

  – On-chip 2-cycle Multiplier

• Nonvolatile Program and Data Memories

  – 8K Bytes of In-System Self-Programmable Flash Endurance: 10,000 Write/Erase Cycles

  – Optional Boot Code Section with Independent Lock Bits In-System Programming by On-chip

     Boot Program True Read-While-Write Operation

  – 512 Bytes EEPROM Endurance: 100,000 Write/Erase Cycles

  – 1K Byte Internal SRAM

  – 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 Eight 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

  – 2.7 - 5.5V (ATmega8L)

  – 4.5 - 5.5V (ATmega8)

• Speed Grades

  – 0 - 8 MHz (ATmega8L)

  – 0 - 16 MHz (ATmega8)

• Power Consumption at 4 Mhz, 3V, 25°C

  – Active: 3.6 mA

  – Idle Mode: 1.0 mA

  – Power-down Mode: 0.5 µA

Overview

The ATmega8 is a low-power CMOS 8-bit microcontroller based on the AVR RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega8 achieves throughputs approaching 1 MIPS per MHz, allowing the system designer to optimize power consumption versus processing speed.

Pin Configurations

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