Original Specification Parameters and Pin Function Diagram of ATMEGA8A - AU AVR Microcontroller

The ATMEGA8A - AU is a low - power CMOS 8 - bit microcontroller based on the AVR® enhanced RISC architecture. By executing powerful instructions within a single clock cycle, the ATmega8A achieves a throughput of nearly 1 MIPS per MHz. This enables system designers to optimize the device for power consumption and processing speed.

The AVR® core combines an extensive instruction set and 32 general - purpose working registers. All 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one instruction executed within one clock cycle. The resulting architecture is more efficient code, while achieving a throughput up to ten times faster than that of traditional CISC microcontrollers.

The ATMEGA8A - AU features an 8 - KB in - system programmable flash memory with read - write functions, 512 - B EEPROM, 1 - KB SRAM, 23 general - purpose I/O lines, 32 general - purpose working registers, three flexible timer/counters with compare mode, internal and external interrupts, a serial programmable USART, a byte - oriented two - wire serial interface, a 6 - channel ADC with 10 - bit precision (8 channels in TQFP and QFN/MLF packages), a programmable watchdog timer with an internal oscillator, an SPI serial port, and five software - selectable power - saving modes.

Specification Parameters

Functional Features

High - performance, low - power AVR 8 - bit microcontroller
• Advanced RISC architecture
– 130 powerful instructions - most of them are executed in a single clock cycle
– 32×8 general - purpose working registers
– Fully static operation
– Throughput of up to 16 MIPS at 16 MHz
– On - chip 2 - cycle multiplier
• High - durability non - volatile memory segments
– 8 KB in - system self - programmable flash memory
– 512B EEPROM

· 1 KB internal SRAM

· Write/erase cycles: 10,000 for flash memory/100,000 for 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 via on - chip boot program
• True read - while - write operation

· Software security programming lock

· Capacitive touch buttons, sliders and wheels

· QTouch and QMatrix acquisition

· Up to 64 sensing channels
• Peripheral functions

· Two 8 - bit timer/counters with independent prescalers, one with compare mode

· One 16 - bit timer/counter with independent prescaler, compare mode and capture mode

· Real - time counter with independent oscillator

· Three PWM channels

· 8 - channel ADC in TQFP and QFN/MLF packages
© 2018 Microchip Technology Incorporated Product Introduction Summary 40001991A - Page 1
• Eight - channel with 10 - bit precision

· 6 - channel ADC in PDIP package
• Six - channel with 10 - bit precision

· Byte - oriented two - wire serial interface

· Programmable serial USART

· Master/slave SPI serial interface

· Programmable watchdog timer with independent on - chip oscillator

· On - chip analog comparator
• Special microcontroller functions

· 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 - saving, Power - down and Standby
• I/O and Packages

· 23 programmable I/O lines

· 28 - lead PDIP, 32 - lead TQFP and 32 - pad QFN/MLF
• Operating Voltage

· 2.7 - 5.5 volts
• Speed Grade

· 0 - 16 MHz
• Power Consumption at 4 MHz, 3V, 25°C

· Active: 3.6 mA

· Idle mode: 1.0 mA

· Power - down mode: 0.5 μA

Pin Configuration

Package Design Parameters

The ATmega8A - AU is an 8 - bit AVR microcontroller. It is a member of the AVR series and is widely used in various applications such as embedded systems, automatic control, and electronic projects.

1. 8 - bit microcontroller: It is an 8 - bit microcontroller with the ability to process 8 - bit data. It is suitable for many low - to - medium - complexity control and calculation tasks.

2. Flash memory: The chip has an 8 - KB flash memory built - in, which is used to store program codes. This enables users to burn program codes into the chip and update them at any time.

3. SRAM memory: It is equipped with 1 - KB static random - access memory (SRAM) for storing variables and runtime data.

4. EEPROM memory: The chip also has 512 - byte electrically erasable programmable read - only memory (EEPROM) built - in, which is used to store non - volatile data such as configuration parameters and calibration values.

5. Low - power mode: The chip has multiple low - power modes, which are suitable for applications with high energy - saving requirements and help to extend battery life.

6. Multiple communication interfaces: The ATmega8A - AU integrates serial communication interfaces, including USART (asynchronous serial communication) and SPI (serial peripheral interface), facilitating communication with other devices.

1. Digital and analog I/O: The chip has digital input/output pins and analog input pins, and can be connected to devices such as sensors and actuators.

2. Timers and counters: The chip has multiple timers and counters, which are used for applications such as generating precise timing and measuring time intervals.

3. External interrupt: The ATmega8A - AU supports external interrupt pins, which can be used to detect external events and trigger corresponding processing.

4. Application range: This microcontroller is widely used in various application fields such as embedded systems, sensor interfaces, motor control, automated equipment, and household appliances.

In short, the ATmega8A - AU is a multifunctional 8 - bit AVR microcontroller with features such as flash memory storage, low - power mode, communication interfaces, and timers, and is suitable for various embedded controls.