Atmega8 is a 8 bit AVR RISC-based Microcontroller from
Atmel. It is best suitable for beginners. It has 8KB of programmable flash
program memory. It’s a 28 pin IC and has 3 ports Port B which is 8 bit, Port C which
is 7 bit Port D which is 8 bit. The clock source can be internal or external. Internal
clock is a calibrated RC oscillator which can be operated 1,2,4, or 8 MHz.
External clock can be a crystal oscillator or any RC oscillator. It has 32
general purpose registers/CPU registers. The pin configuration is shown below. For detailed information refer to the
datasheet. 
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