Part Number: ATMEGA64A-AU

Manufacturer: Microchip Technology / Atmel

Description: 8-bit Microcontrollers – MCU 64K Flsh 2K EEPROM 4K SRAM 16MHz

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Technical Specifications of ATMEGA64A-AU

Datasheet  ATMEGA64A-AU datasheet
Category Integrated Circuits (ICs)
Family Embedded – Microcontrollers
Manufacturer Atmel
Series AVR? ATmega
Packaging Tray
Part Status Active
Core Processor AVR
Core Size 8-Bit
Speed 16MHz
Connectivity I2C, SPI, UART/USART
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Number of I/O 53
Program Memory Size 64KB (32K x 16)
Program Memory Type FLASH
EEPROM Size 2K x 8
RAM Size 4K x 8
Voltage – Supply (Vcc/Vdd) 2.7 V ~ 5.5 V
Data Converters A/D 8x10b
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Package / Case 64-TQFP
Supplier Device Package 64-TQFP (14×14)

The ATMEGA64A-AU is an 8-bit, low-power, AVR RISC-based microcontroller with a real-time counter, 53 general-purpose I/O lines, 32 working registers, an 8-channel/10-bit A/D converter, and two USARTs. The equipment can function between 2.7 and 5.5V. The device balances power consumption and processing performance by executing full instructions in a single clock cycle, which results in throughputs that are close to 1 MIPS per MHz.

ATMEGA64A-AU Features

High Endurance Non-Volatile Memory Segments

  • It Contains 130 Effective Instructions.
  • It contains peripheral control registers and 32 × 8 general-purpose working registers.
  • Fully Static Operation is a feature.
  • It has a throughput of up to 16 MIPS at 16 MHz.
  • It has a 2-cycle On-Chip Multiplier.

JTAG (IEEE std. 1149.1 Compliant) Interface

  • Boundary-scan capabilities by the JTAG Standard are present.
  • Extensive On-chip Debug Support is a feature.
  • The JTAG Interface offers Flash, Fuses, EEPROM, and Lock Bits programs.

Peripheral Features

  • Two 8-bit Timer/Counters with independent rescalers and compare modes are included.
  • It has two expanded 16-bit timers/counters, a separate Prescaler, and capture mode, as well as compare mode.
  • It has a separate oscillator and a real-time counter.
  • There are two 8-bit PWM Channels on it.
  • With programmable resolution from 1 to 16 bits, it has 6 PWM channels.
  • It has an eight-channel, ten-bit ADC.

Frequently Asked Questions

What Does Bit Microcontroller Mean?

A microcontroller’s bit descriptor specifies the maximum amount of data the chip can simultaneously process. For example, an 8-bit device may perform addition on two values that are each 8 bits long without having to access any additional memory (along with a carry bit for the potential overflow).

What Does 8-Bit Mean?

8 bits is a measurement of computer information typically used to refer to hardware and software in an age when computers could only store and process a maximum of 8 bits per data block. In this era, 8 bits were the most that could be stored and processed in a single data block.

8-bit Vs. 32-bit (How do they compare?)

The capabilities of the most recent central processing units (CPUs) continue to improve alongside technological advancements. Increased bit size has traditionally been one of the most eagerly desired improvements. For this reason, the performance of 8-bit microcontrollers will differ from that of 32-bit equivalents.

The initial processor, the Intel 4004, was a 4-bit central processing unit (CPU), and after the release of the Intel 8008, most designers shifted their focus to the 8-bit space.

Because of its capacity to work with larger numbers, access more memory, and carry out more complicated operations, computer designers (such as IBM) shifted back to the higher bit count when Intel launched the 8086.

However, despite mainstream computers always utilizing the most recent technology, a significant market that utilized 8-bit technology from the late 1970s through the early 1990s was the home computer sector.

Increasing the bit-width of a CPU does enhance a computer’s performance. Still, for simple applications, such as word processing, gaming, music development, spreadsheets, and task management, 8 bits is frequently sufficient. Increasing the bit-width of a CPU does improve a computer’s performance.

Microcontrollers with 8 bits of memory have maintained their usefulness far into the current day thanks to the capabilities of 8-bit technology and the declining prices of electrical components.

How do traditional 8-bit microcontrollers stack against the most advanced microcontrollers available today?

Microcontrollers are available in various forms and sizes in today’s market. Some include highly sophisticated features like internet connectivity, numerous processing cores, and extensive hardware security.

However, these same devices might be pricey, so you must be sure that you compare apples to apples. The STM32 family of microcontrollers is a good example of a typical modern microcontroller. These microcontrollers use 32-bit ARM cores and have a wide variety of functionality, such as I2C, SPI, and DMA controllers, while also being more affordable than many other 8-bit microcontrollers.

As a point of reference, the PIC18 family comprises 8-bit microcontrollers that come with a comprehensive collection of peripherals, contain comparable quantities of memory (often 16K ROM and 8K RAM), and are encased in similarly compact housings.

The AVR family of 8-bit microcontrollers possesses capabilities comparable to those of the PIC18 range, and the ATmega328 is the chip that provides power to the well-known Arduino Uno.

In conclusion, low-end 32-bit microcontrollers offer a very little extra in comparison to 8-bit microcontrollers that are capable of performing the same task; in fact, using them can result in an over-complication of a project. The main difference between the two types of microcontrollers is the bit-width of the CPU.

What are some applications for 8-bit microcontrollers?

What uses 8-bit microcontrollers can be put to be what counts most. In general, an 8-bit microcontroller can nearly always be used if a device doesn’t need to connect to the internet or has weak security requirements.

While 8-bit numbers are constrained in size, huge numbers can be divided into numerous steps, and C compilers support this (of course, this can still be done in an assembler). As a result, an 8-bit microcontroller can still be used for any application that needs to use numbers bigger than 255.

Even though 8-bit microcontrollers often lack internet connectivity, they can be connected to other peripherals like ethernet controllers and Wi-Fi bridges to establish a connection.

Modern security procedures demand that communication between the 8-bit microcontroller and the internet service use strong encryption and that the peripheral(s) providing internet access employ powerful security safeguards.

Due to the high memory needs of encryption techniques, this may be challenging for 8-bit microcontrollers; therefore, employing a peripheral that can handle this would be desirable.


We hope that this post was able to provide you with some knowledge that will help you out. If you have any queries, please do not be reluctant to leave them in the comment sections below, and we will do our best to respond to them as quickly as possible. Feel free to look around at your convenience on our website to get any extra information you may require; a lot of content can be used there.

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