The ATMEGA8A is a low-power CMOS 8-bit microcontroller based on the AVR RISC architecture. By executing powerful instructions in a single clock cycle, the ATMEGA8A achieves through puts approaching 1 MIPS per MHz, allowing the system designer to optimize power consumption versus processing speed. 

Features:-

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

• Advanced RISC Architecture 

   - 131 powerful instructions – most single clock cycle execution 

   - 32 × 8 General Purpose Working Registers + Peripheral Control 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 and 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 VQFN package  

       • Eight Channels 10-bit Accuracy 

   – 6-channel ADC in PDIP package 

      • Six Channels 10-bit Accuracy 

   – Master/Slave SPI Serial Interface 

   – Programmable Watchdog Timer with On-chip Oscillator 

   – On-chip Analog Comparator 

   – Byte Oriented 2-wire Serial Interface 

• Special Microcontroller Features 

  – Power-on Reset and Programmable Brown-out Detection 

  – Internal Calibrated RC Oscillator 

  – External and Internal Interrupt Sources 

  – Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and  Extended Standby '

• I/O and Packages 

    ̶  23 Programmable I/O Lines 

    ̶  28-lead PDIP, 32-lead TQFP, and 32-pad VQFN 

• Operating voltage 

   – 2.7 - 5.5V 

   – 0 - 16MHz 

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

   - Active: 3.6mA 

   - Idle Mode: 1.0mA 

   - Power-down Mode: 0.5µA 

Specification:-

Related Document:-

 ATMEGA8A SMD Data Sheet