ATMEGA8A

The ATmega8A is a low-power CMOS 8-bit microcontroller based on the AVR® enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega8A achieves throughputs close to 1 MIPS per MHz. This empowers system designers to optimize the device for power consumption versus processing speed.

Features
• High-performance, Low-power 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 16 MIPS throughput at 16 MHz
– On-chip 2-cycle multiplier
• High Endurance Nonvolatile Memory segments
– 8 KB of In-System Self-programmable Flash program memory
– 512B EEPROM
– 1 KB 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
– 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 QFN/MLF package
© 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 1
• 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