ATmega8A 8-bit microcontroller: ATmega8A, Pinout, Datasheet

ATmega8A Symbol

ATmega8a Footprint

ATmega8A 3D Model

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.

The Microchip AVR® core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the  Arithmetic Logic Unit  (ALU), allowing two independent registers to be accessed
in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.

The ATmega8A provides the following features: 8K bytes of In-System Programmable Flash with Read-WhileWrite capabilities, 512 bytes of EEPROM, 1K byte of SRAM, 23 general-purpose I/O lines, 32 general purpose working registers, three flexible  Timer /Counters with compare modes, internal and external interrupts, a serial programmable USART, a byte-oriented Two-wire  Serial Interface, a 6-channel ADC (eight channels in TQFP and VQFN packages) with 10-bit accuracy, a programmable Watchdog  Timer with Internal Oscillator, an  SPI  serial port, and five software selectable power saving modes. 

The Idle mode stops the CPU while allowing the SRAM, Timer/Counters,  SPI port, and interrupt system to continue functioning. The Power-down mode saves the register contents but freezes the Oscillator, disabling all other chip functions until the next Interrupt or Hardware Reset. In Power-save mode, the asynchronous timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except asynchronous timer and ADC, to minimize switching noise during ADC conversions. In Standby mode, the
crystal/resonator Oscillator is running while the rest of the device is sleeping. This allows very fast start-up combined with low-power consumption. 

• 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 

ATmega8A Block Diagram

Microchip Technology ATMEGA8A-PU technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology ATMEGA8A-PU.

ATmega8A Package

Note: More details can see in the datasheet of ATmega8A below.

Microchip Technology Inc. is a leading provider of microcontroller and analogue semiconductors, providing low-risk product development, lower total system cost and faster time to market for thousands of diverse customer applications worldwide. Headquartered in Chandler, Arizona, Microchip offers outstanding technical support along with dependable delivery and quality.

Download datasheets and manufacturer documentation for Microchip Technology ATMEGA8A-PU.