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:- Parameters Values Program Memory Type Flash Program Memory Size (KB) 8 CPU Speed (MIPS/DMIPS) 16 SRAM (B) 1,024 Data EEPROM/HEF (bytes) 512 Digital Communication Peripherals 1-UART, 1-SPI, 1-I2C Timers 2 x 8-bit, 1 x 16-bit Number of Comparators 1 Temperature Range (°C) -40 to 85 Operating Voltage Range (V) 2.7 to 5.5 Pin Count 32 Related Document:- ATMEGA8A SMD Data Sheet
