Фото чипа atmega8a в корпусе dip28Представляю вам даташит на микроконтроллер 
ATmega8 фирмы 
Atmel, а нынче 
Microchip. Чип не новый, но по прежнему является отличным выбором для самоделок и обучения начинающих!
•     High-performance, Low-power Atmel 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 16MIPS Throughput at 16MHz 
–    On-chip 2-cycle Multiplier
•     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