Description

The ATMEGA8A-AU is a 8-bit high-performance low-power AVR RISC-based Microcontroller combines 8kB ISP flash memory with read-while-write capabilities, 512B EEPROM, 1kB SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible timer/counters with compare modes, internal and external interrupts, serial programmable USART, a byte oriented Two-Wire serial interface, 6-channel 10-bit A/D converter, programmable watchdog timer with internal oscillator, SPI serial port and five software selectable power saving modes. The device operates between 2.7 to 5.5V.
By executing powerful instructions in a single clock cycle, the device achieves throughputs approaching 1 MIPS per MHz, balancing power consumption and processing speed.
Features:

• 8kB ISP flash memory with read-while-write capabilities
• 512B EEPROM
• 1kB SRAM
• 23 general purpose I/O lines
• 32 general purpose working registers
• Three flexible timer/counters with compare modes,
• Internal and external interrupts
• Serial programmable USART,
• 6-channel 10-bit A/D converter
• Programmable watchdog timer with internal oscillator
• SPI serial port and five software selectable power saving modes.
• The device operates between 2.7 to 5.5V.

Note:
This is a Surface Mount Microcontroller means that its pins are not through holes and can be mounted or placed directly onto the surface of printed circuit boards (PCBs)

Document:

Datasheet