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Introduction to ATmega328A Microcontroller Architecture Feautures Register mode-pinout Applications

ATmega328 is an 8-bit, 28-Pin AVR Microcontroller, manufactured by Microchip, follows RISC Architecture and has a flash-type program memory of 32KB,
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Introduction to ATmega328A Microcontroller Architecture Feautures Register mode-pinout Applications

Introduction ATmega328A Microcontrollers:

ATmega-328 has 32KB internal flash memory. ATmega328 has 1KB Electrically Erasable Programmable Read-Only of the Memory (EEPROM). This property shows if the electric supply supplied to the microcontroller is removed, even then it could store the data and can provide results after providing it with the electric supply. Moreover, ATmega-328 has 2KB Static Random Access of the Memory (SRAM). Another characteristic will be explained later. ATmega 328 has several different features which make it the most popular of the device in today's market. These features consist of advanced RISC architecture, good performance, low power supply consumption, real timer counter having a separate oscillator, 6 PWM pins, programmable Serial USART, programming lock for software security, throughput up to 20 MIPS, etc. Further details about the ATmega 328 will be given later in this section.

ATmega328 is an eight-bit, 28-pin AVR Microcontroller, manufactured by Microchip, follows RISC Architecture, and has a flash-type program memory of 32KB.Atmega328 is the microcontroller, used in basic Arduino boards i.e. Arduino UNO, Arduino Pro Mini, or Arduino Nano. It has an EEPROM memory of 1KB and its SRAM of the memory is 2KB. It has 8 Pins for ADC of the operations, which all combine to form PortA ( PA0 - PA7 ). It also has 3 built-in Timers, two of them are eight-bit timers while the third one is a 16-bit Timer. You must have heard of Arduino UNO, UNO is based on an atmega328 of the Microcontroller. It is UNO's heart. It operates ranging from 3.3V to 5.5V but normally we use 5V as a stand.Its excellent features include cost-efficiency, low power supply dissipation, a programming lock for security purposes, and a real timer counter with a separate oscillator. It is normally used in Embedded Systems of applications. You would have a look at these Real Life Examples of Embedded Systems, we could design all of them using this Microcontroller. The following table shows the complete of the features of ATmega328.


  1. CPU type: 8-bit AVR
  2. Capacitive touch sensing channels: 16
  3. Package pin count: 28 or 32
  4. EEPROM: 1 KB
  5. Flash memory: 32 KB
  6. SRAM: 2 KB
  7. Performance: 20 MIPS at 20 MHz
  8. Maximum CPU speed: 20 MHz
atmega328a microcontrollers

ATmega328A Microcontrollers Pinout Configuration:

1. Voltage Reference (pin-4):A connection that gives a precise measurement of the voltage.

2. Analog (pin-5):Electrical of the signals that vary continuously over time.

atmega328a microcontrollers pinout

3. Digital (pin-6):Electrical signals that have only two possible states: on or off.

Read also:

Circuit Operation:

The ATMEGA328P-PU is a CMOS 8-bit microcontroller based on the AVR-improved RISC architecture with reduced power supply consumption. The devices achieve CPU throughput approaching one million instructions per second (MIPS) per megahertz by executing instructions in a single clock of the cycle, allowing the system designer to optimize power supply consumption versus processing performance. The pico power supply 8bit AVR RISC-based microcontroller features 32KB ISP flash memory with read-while-write capabilities, 1024B EEPROM, 2KB SRAM, 23 general-purpose I/O lines, 32 general-purpose working registers, three flexible timer/counters with compare modes, internal and external interrupts, serial programmable USART, a byte-oriented two-wire serial interface, SPI serial port, a 6-channel 10-bit A/D converter (8- The device works with a voltage range of 1.8 to 5.5 volts).

The driver of smart electronics products and advanced electronics systems of the technologies is the utilization of embedded systems. The components that provide operational functionality and control are microprocessors (MPUs) or microcontrollers (MCUs). MPUs are typically highly integrated components used when extensive processing of the capability is required. MCUs are used for more specific functionality like industrial control or smart of appliances.

Creating a quality circuit diagram board design necessitates you institute best practices, such as following your CM’s DFM and DFA rules and guidelines to ensure your board can be built efficiently. The same is true for developing an embedded system however, component selection, especially the MCU, is more important as it affects all aspects of your PCB layout. The ATmega328, by Microchip Technology Inc., is a good choice for many of the applications. However, to make the best package selection or fully leverage the advantages this MCU offers begins with understanding the AT328p328 pinout.

Frequently Asked Questions

What is ATmega32 architecture?

Atmel's ATmega32 is an 8-bit RISC of the processor, based on Harvard architecture. This new hardware replaced systems using Freescale's S12 of the processor, which is a 16-bit CISC processor, based on Princeton architecture. Thus, this change was a fundamental shift on at least three axes of the computer of characteristics.

Why is it called ATMega328?

The name of this microcontroller is the ATmega328p which is a product of ATmel. 32 - represents its flash memory capacity which is 32KB. eight - represents its CPU type which is 8 bit. p - simply denotes that it needs less power supply to work than its earlier version.

What is the power source of ATmega328?

The ATmega328P Xplained Mini kit could be powered by a USB or an external voltage input VIN. The default power supply source is 5.0V from a USB. The USB port is protected with a 500 mA of the PTC resettable fuse. The ATmega328P is powered from the 5.0V of the USB voltage by default.

How many PWM pins are there in ATmega328?

The ATmega168P/328P chip has three PWM timers, controlling 6 PWM of the outputs. By manipulating the chip's timer registers directly, you could obtain more control than the analogWrite function provides.

What is the application of ATmega328?

ATmega328 is commonly used in many projects or autonomous systems where a simple, low-powered, low-cost microcontroller is needed. Perhaps the most common implementation of this chip is on the popular of Arduino development platforms, namely the Arduino Uno, Arduino Pro Mini, and Arduino Nano of the models.

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