The Microchip AVR® 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 throughputs approaching 1 MIPS per MHz, allowing the system designer to optimize power consumption versus processing speed.



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• High-performance, Low-power Microchip 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

• 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

• Microchip QTouch® library support

- Capacitive touch buttons, sliders and wheels

- Microchip QTouch and QMatrix™ acquisition

- Up to 64 sense channels

• 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 VQFN 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

• Special Microcontroller Features

- Power-on Reset and Programmable Brown-out Detection

- Internal Calibrated RC Oscillator

- External and Internal Interrupt Sources

- Five Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, and Standby

• I/O and Packages

- 23 Programmable I/O Lines

- 28-lead PDIP, 32-lead TQFP, and 32-pad VQFN

• Operating Voltages

- 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

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