Представляю 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