ATMEGA328P Microcontroller Pinout, Datasheet, Schematic and Uses
Update Time: 2023-12-21 11:51:04
Contents
The ATmega328P is a widely embraced microcontroller in the DIY electronics realm. A favored selection for individuals delving into DIY projects, this single-chip microcontroller takes center stage in the newest iterations of Arduino Unos and various other microcontroller boards. Yet, what essential information should one grasp about the ATmega328P before embarking on their Arduino endeavors? In this article, we'll delve into the ATMEGA328P pinout, datasheet, schematic, etc. and explore where & how to use It.
What is ATMEGA328P?
ATmega328P embodies a compact single-chip microcontroller rooted in an 8-bit RISC processor core. This diminutive yet high-performance microcontroller boasts low power consumption and cost-effectiveness, rendering it an optimal choice for diverse applications, especially within your DIY projects. Renowned as the most widespread AVR controller, it is central in ARDUINO boards.
For numerous years, the ATmega328P chip has been a critical component in Arduino systems. Its prevalence extends to the Arduino Uno, Arduino Pro Mini, and Arduino Nano boards. Consequently, it is ubiquitous in the DIY electronics domain, prompting a beneficial exploration of its capabilities for those intending to employ these boards.
ATMEGA328P Pinout
The Atmega328P features a pin count of 28.
Among these are 14 digital I/O pins, with the flexibility of assigning 6 for PWM outputs and 6 for analog input. This sums up to a total of 20 pins dedicated to I/O functions.
The pinout diagram for the Atmega328 is provided below.
Atmega328 pin diagram
Pin Configuration
Numerous pins on the Atmega328P serve multiple functions. The functions of each pin will be detailed in the table below.
Pin No. Pin Name Description Function 1 PC6 (RESET) Pin6 of PORTC Pin by default is used as RESET pin. PC6 can only be used as I/O pin when RSTDISBL Fuse is programmed. 2 PD0 (RXD) Pin0 of PORTD RXD (Data Input Pin for USART)
USART Serial Communication Interface
[Can be used for programming]
3 PD1 (TXD) Pin1 of PORTD TXD (Data Output Pin for USART)
USART Serial Communication Interface
[Can be used for programming]
INT2( External Interrupt 2 Input)
4 PD2 (INT0) Pin2 of PORTD External Interrupt source 0 5 PD3 (INT1/OC2B) Pin3 of PORTD External Interrupt source1
OC2B(PWM - Timer/Counter2 Output Compare Match B Output)
6 PD4 (XCK/T0) Pin4 of PORTD T0( Timer0 External Counter Input)
XCK ( USART External Clock I/O)
7 VCC Connected to positive voltage 8 GND Connected to ground 9 PB6 (XTAL1/TOSC1) Pin6 of PORTB XTAL1 (Chip Clock Oscillator pin 1 or External clock input)
TOSC1 (Timer Oscillator pin 1)
10 PB7 (XTAL2/TOSC2) Pin7 of PORTB XTAL2 (Chip Clock Oscillator pin 2)
TOSC2 (Timer Oscillator pin 2)
11 PD5
(T1/OC0B)Pin5 of PORTD T1(Timer1 External Counter Input)
OC0B(PWM - Timer/Counter0 Output Compare Match B Output)
12 PD6 (AIN0/OC0A) Pin6 of PORTD AIN0(Analog Comparator Positive I/P)
OC0A(PWM - Timer/Counter0 Output Compare Match A Output)
13 PD7 (AIN1) Pin7 of PORTD AIN1(Analog Comparator Negative I/P) 14 PB0 (ICP1/CLKO) Pin0 of PORTB ICP1(Timer/Counter1 Input Capture Pin)
CLKO (Divided System Clock. The divided system clock can be output on the PB0 pin)
15 PB1 (OC1A) Pin1 of PORTB OC1A (Timer/Counter1 Output Compare Match A Output)
16 PB2 (SS/OC1B) Pin2 of PORTB SS (SPI Slave Select Input). This pin is low when controller acts as slave.
[Serial Peripheral Interface (SPI) for programming]
OC1B (Timer/Counter1 Output Compare Match B Output)
17 PB3 (MOSI/OC2A) Pin3 of PORTB MOSI (Master Output Slave Input). When controller acts as slave, the data is received by this pin. [Serial Peripheral Interface (SPI) for programming]
OC2 (Timer/Counter2 Output Compare Match Output)
18 PB4 (MISO) Pin4 of PORTB MISO (Master Input Slave Output). When controller acts as slave, the data is sent to master by this controller through this pin.
[Serial Peripheral Interface (SPI) for programming]
19 PB5 (SCK) Pin5 of PORTB SCK (SPI Bus Serial Clock). This is the clock shared between this controller and other system for accurate data transfer.
[Serial Peripheral Interface (SPI) for programming]
20 AVCC Power for Internal ADC Converter 21 AREF Analog Reference Pin for ADC 22 GND GROUND 23 PC0 (ADC0) Pin0 of PORTC ADC0 (ADC Input Channel 0) 24 PC1 (ADC1) Pin1 of PORTC ADC1 (ADC Input Channel 1) 25 PC2 (ADC2) Pin2 of PORTC ADC2 (ADC Input Channel 2) 26 PC3 (ADC3) Pin3 of PORTC ADC3 (ADC Input Channel 3) 27 PC4 (ADC4/SDA) Pin4 of PORTC ADC4 (ADC Input Channel 4)
SDA (Two-wire Serial Bus Data Input/output Line)
28 PC5 (ADC5/SCL) Pin5 of PORTC ADC5 (ADC Input Channel 5)
SCL (Two-wire Serial Bus Clock Line)
The table shows that the pin configurations for distinct MCU architectures differ. However, each device encompasses 23 bi-directional I/O pins.
As previously mentioned, 20 of these pins serve as I/O ports, capable of functioning as either circuit inputs or outputs. The determination of whether they operate as input or output is configured in the software. Out of the 20, 14 are digital pins; among them, 6 can produce PWM output. Additionally, 6 pins are designated for analog input/output.
Two pins are dedicated to the crystal oscillator, essential for supplying a clock pulse to the Atmega chip. Synchronization is crucial for coordinated communication between the Atmega chip and connected devices.
The chip requires power for its operation, which is provided by two pins, Vcc and GND. The Atmega328 is a low-power chip, necessitating a power supply ranging from 1.8 to 5.5 V for its functionality.
Featuring an embedded analog-to-digital converter (ADC), the Atmega328 interprets analog signals. The chip allocates 6 pins for analog input, with the ADC relying on three specific pins—AVCC, AREF, and GND. AVCC serves as the positive voltage power supply for the ADC, ensuring its independent operation. GND represents the power supply ground, and AREF is the reference voltage used by the ADC to convert analog signals into corresponding digital values. The ADC's 10-bit resolution signifies its ability to produce a 10-bit digital representation, utilizing AREF as a reference for discerning high and low digital values. Consequently, this digital value mirrors the analog signal, offering a digital counterpart.
The final pin is the RESET pin, facilitating the rerun and restart of a program.
Pin Reference
Power & Control
VCC & GND
These serve as the primary supply pins. It's essential to connect all GND pins together. The VCC supply has a range from 1.8V to 5.5V. Note that altering the voltage will impact the maximum clock frequency at which the microcontroller can reliably operate. Refer to the datasheet for detailed information.
XTAL
XTAL1 and XTAL2 function as the pins for external clock signals to the microcontroller. You can connect a crystal oscillator to these pins along with capacitors. The fuses must be configured to choose an external oscillator. If an external clock source is available, it can be connected to XTAL1 while leaving XTAL2 unconnected. Both pins have IO functions, but these functions cannot be used when the pins serve as clock inputs. For additional details, refer to the "Alternate Functions of Port B" section in the datasheet.
AVCC
AVCC is the supply pin for the internal ADC of ATmega328P. Connect this pin externally to VCC, along with a filter capacitor, even if the ADC is not in use. It's possible to link a low-noise supply to this pin, but in such cases, the supply voltage must not deviate from VCC by more than ±0.3V.
AREF
The ATmega328P provides two options for the ADC reference voltage: an internal reference of 1.1V (nominal) and AVCC supply. AREF is the pin used to decouple the ADC reference voltage, enhancing noise performance.
RESET
RESET serves as an active-low external reset input for ATmega328P. Typically, this pin is pulled up with a 10K resistor and a 0.1uF capacitor connected to GND. A LOW pulse of 2.5 μs or longer can reset the MCU (without the capacitor). RESET also has a GPIO function, but it can only be utilized when the external reset function is disabled.
Feature & Specifications
CPU 8-bit AVR Number of Pins 28 Operating Voltage (V) +1.8 V TO +5.5V Number of programmable I/O lines 23 Communication Interface Master/Slave SPI Serial Interface(17,18,19 PINS) [Can be used for programming this controller]
Programmable Serial USART(2,3 PINS) [Can be used for programming this controller]
Two-wire Serial Interface(27,28 PINS)[Can be used to connect peripheral devices like Servos, sensors and memory devices]
JTAG Interface Not available ADC Module 6channels, 10-bit resolution ADC Timer Module Two 8-bit counters with Separate Prescaler and compare mode, One 16-bit counter with Separate Prescaler,compare mode and capture mode. Analog Comparators 1(12,13 PINS) DAC Module Nil PWM channels 6 External Oscillator 0-4MHz @ 1.8V to 5.5V
0-10MHz @ 2.7V to 5.5V
0-20MHz @ 4.5V to 5.5V
Internal Oscillator 8MHz Calibrated Internal Oscillator Program Memory Type Flash Program Memory or Flash
memory32Kbytes[10000 write/erase cycles] CPU Speed 1MIPS for 1MHz RAM 2Kbytes Internal SRAM EEPROM 1Kbytes EEPROM Watchdog Timer Programmable Watchdog Timer with Separate On-chipOscillator Program Lock Yes Power Save Modes Six Modes[Idle, ADC Noise Reduction, Power-save, Power-down, Standby and Extended Standby] Operating Temperature -40°C to +105°C(+105 being absolute maximum, -40 being absolute minimum) Interface 2-Wire, I2C, SPI, UART, USART Package / Case 28-DIP (0.300, 7.62mm)
ATmega328p-based Microcontroller Boards
Adafruit METRO 328 - Renowned for its user-friendly design, the Adafruit METRO 328 features a core powered by the ATmega328, offering 32KB of flash and 2KB of RAM, operating at 16MHz.
Arduino Pro Mini 328 - Positioned as a microcontroller board, the Arduino Pro Mini 328 centers around the ATmega328 chip. It encompasses 14 digital I/O pins (with 6 supporting PWM output), 6 analog inputs, an 8 MHz onboard resonator, a reset button, and provisions for mounting pin headers. A six-pin title allows connection to an FTDI cable or TTL serial adapter for both board power-up and programming.
Arduino Uno R3 - Embracing open-source principles, the Arduino Uno features the microchip ATmega328P. It includes 6 analog input pins, 14 digital I/O pins (with 6 supporting PWM), a 16 MHz ceramic crystal resonator, a USB-B port, an ICSP header, a power jack, and a reset button.
Arduino Nano - While matching the functionality of the Arduino Uno, the Arduino Nano distinguishes itself by its compact size. Notably, it needs a DC power jack, relying instead on a Mini-B USB cable for power, deviating from the standard connection.
ATMEGA328P Block Diagram
Where to Use ATMEGA328P
While numerous controllers are available, the ATMEGA328P is the most widely embraced, owing to its noteworthy features and cost-effectiveness. The preference for this controller extends to the development of ARDUINO boards due to its advantageous features.
Possessing a program memory of 32 Kbytes, the ATMEGA328P finds application in a diverse range of scenarios.
Incorporating various POWER SAVING modes enables its functionality in MOBILE EMBEDDED SYSTEMS.
Equipped with a Watchdog timer to reset in error situations, it proves valuable in systems with minimal human intervention.
The utilization of advanced RISC architecture ensures rapid program execution.
Additionally, featuring an in-chip temperature sensor enhances the controller's adaptability to extreme temperature environments.
The amalgamation of these features collectively enhances the promotion of the ATMEGA328P.
How to Use ATMEGA328P
Utilizing ATMEGA328 is akin to employing any other controller. Its primary function is execution based on programming. The controller operates by executing the program provided to it, and without programming, it remains inert.
As mentioned, the initial step involves programming the controller by inscribing the suitable program file into the ATMEGA328P FLASH memory. Once this program code is deposited, the controller performs the instructions and produces the corresponding output.
The entire process of employing an ATMEGA328P unfolds as follows:
1. Enumerate the functions to be executed by the controller.
2. Express these functions in a programming language within the Integrated Development Environment (IDE) programs.
You can freely download the IDE program from the company's websites. The IDE program for AVR controllers is 'ATMEL STUDIO,' and the links are provided below:
3. Programming the ATMEGA328P can also be accomplished using the ARDUINO IDE.
4. After composing the program, perform a compilation to identify and rectify errors.
5. Instruct the IDE to generate a HEX file containing the machine code for the program after successful compilation.
6. This HEX file, embodying the machine code, must be written into the controller's flash memory.
7. Select the programming device, usually an SPI programmer designed for AVR controllers, to establish communication between the PC and ATMEGA328P.
Alternatively, you can employ an ARDUINO UNO board for programming.
8. Execute the programmer software and designate the appropriate HEX file.
9. Transfer the HEX file of the written program into the ATMEGA328P flash memory using the programming tool.
10. Disconnect the programmer, attach the requisite peripherals to the controller, and initiate the system.
How to Use ATMega328P using Arduino IDE
Given that the ATmega328P is employed in both the Arduino Uno and Arduino Nano boards, it is feasible to substitute the Arduino board with the ATmega328 chip directly. The initial step involves installing the Arduino bootloader into the chip to accomplish this. Alternatively, you can acquire a chip preloaded with the bootloader, such as the ATMega328P-PU.
The IC with the bootloader can be inserted into the Arduino Uno board to burn the program into it. After the Arduino program is successfully burnt into the IC, it can be detached and utilized instead of the Arduino board. This involves pairing it with a crystal oscillator and additional components as the project necessitates. The pin mapping between the Arduino Uno and the ATmega328P chip is detailed below.
To program the ATmega328p microcontroller using the Arduino IDE, the microcontroller can be linked to the computer through specific hardware connections. Typically, this is achieved in two primary methods:
Using a USB to Serial/TTL Adapter
Using an Arduino Board
Arduino Pins
Here are the Arduino pin assignments applicable to the official Arduino Uno board featuring an ATmega328P. For those unfamiliar with Arduino, we offer a comprehensive tutorial covering the basics of the Arduino development framework (ADF) using the widely-used Arduino Uno board.
GPIO
Although the ATmega328P boasts 23 GPIOs, the Arduino framework provides access to only 20, excluding certain alternate function pins. All GPIO pins support internal pull-ups in the range of 20-50K.
Pin No. Pin Name Arduino Digital Pin 2 PD0 0 3 PD1 1 4 PD2 2 5 PD3 3 6 PD4 4 11 PD5 5 12 PD6 6 13 PD7 7 14 PB0 8 15 PB1 9 16 PB2 10 17 PB3 11 18 PB4 12 19 PB5 13 23 PC0 14 24 PC1 15 25 PC2 16 26 PC3 17 27 PC4 18 28 PC5 19
LED
The Arduino Uno features an onboard LED for debugging purposes, connected to digital pin 13. Access this LED pin as LED_BUILTIN in the Arduino IDE.
UART
With just 1 UART available in the ATmega328P, the TXD and RXD pins connect to the USB-Serial chip on an Arduino Uno. For additional UART ports, consider utilizing the SoftwareSerial library. Notably, hardware flow control pins (CTS, RTS) are unavailable in the Arduino framework.
Pin No. Digital Pin Function Arduino Instance 2 0 TXD Serial 3 1 RXD Serial
SPI
While ATmega328P has two SPI (Serial Peripheral Interface) ports, one is shared with the UART. Consequently, only one SPI interface is usable.
Pin No. Digital Pin Function Arduino Instance 17 11 COPI SPI 18 12 CIPO SPI 19 13 SCK SPI 16 10 CS SPI
I2C
A sole I2C (Inter-Integrated Circuit) interface is available in ATmega328P. The I2C pins also share ADC input functions, allowing only one function to be used at a time. In the Arduino environment, I2C is referred to as Wire.
Pin No. Digital Pin Function Arduino Instance 27 18 SDA Wire 28 19 SCL Wire
ADC
Featuring a single 10-bit ADC with 6 multiplexed channels, ATmega328P achieves a maximum sampling rate of 15 ksps. Two additional inputs, AIN0 and AIN1, are designated for analog comparator inputs.
Pin No. Digital Pin Arduino ADC Pin 23 14 A0 24 15 A1 25 16 A2 26 17 A3 27 18 A4 28 19 A5
PWM
The hardware timer blocks of ATmega328P facilitate PWM (Pulse Width Modulation) generation with varying duty cycles and frequencies. PWM output is supported by 6 pins in the Arduino environment, labeled as OCxx on the pinout diagram. The analogWrite() function is employed to output the PWM waveform. Further insights into Arduino Uno PWM can be obtained from – Secrets of Arduino PWM.
Pin No. Digital Pin Frequency (Hz) 5 3 490 11 5 980 12 6 980 15 9 490 16 10 490 17 11 490
External Interrupts
ATmega328P offers only two external interrupt pins, known as INT0 and INT1. These interrupts can detect FALLING, RISING, LOW, or CHANGE triggers. It's important to note that all GPIO ports possess common change interrupt capability. Change interrupts can be generated by any pins of a port, identified as PCINTxx on the pinout diagram.
Pin No. Digital Pin Function 4 2 INT0 5 3 INT1
Using a USB to Serial/TTL Adapter
The USB to Serial/TTL adapter transforms data signals between the computer's USB and the microcontroller's serial/TTL interfaces, facilitating bidirectional communication. This allows the microcontroller to communicate in serial mode with the Arduino IDE running on the PC through the USB connection.
Required Components
For this method, the necessary components include:
Atmega328P microcontroller with the Arduino Bootloader installed
Breadboard
USB to serial/TTL Adapter
16MHz crystal oscillator
Two 22pf capacitors
100nf capacitor
Jumper Wires
100 ohms resistor
LED
Schematic
Establish the connection between the USB to Serial/TTL adapter and the ATmega328p chip following the configuration depicted in the figure below.
ATmega328p to serial TTL adapter connection
Uploading Code
Uploading code to the microcontroller is a straightforward process. After entering your code:
Choose the port connected to your adapter.
Select the board type as "ATmega328p."
Click the upload button.
The upload process will be completed within a few seconds, making the ATmega328 chip ready for use.
Using an Arduino Board
The alternative method employs an Arduino board in either of two analogous approaches:
By substituting the microcontroller on the Arduino Uno with the target microcontroller for programming.
By utilizing any Arduino board as an In-system programmer.
The initial approach is the more straightforward method for uploading code to the ATmega328p chip. It entails the direct replacement of the microcontroller on the Uno with the one slated for programming. Just exchange the microcontrollers and initiate the upload process.
The second method entails leveraging the Arduino Uno as an In-system programmer. Like burning the bootloader into the chip, the Arduino ICSP header is employed to upload code into the ATmega328 chip.
Required components
Arduino Uno
Breadboard
USB to Serial/TTL Adapter
16MHz Crystal Oscillator
Two 22pf Capacitors
Jumper Wires
100 Ohms Resistor
LED
Schematic
Establish the connections following the illustration below.
Note: When employing this method, it is crucial to eliminate the microcontroller from the Arduino board to avoid interference.
Upload Code
The process of uploading code remains consistent with the previously outlined steps. Choose the code file for the ATmega328p, then select the board type (ATmega328p) and the correct port. Click on upload, and the code will be successfully transferred to the microcontroller.
Advantages & Disadvantages of ATmega328P and Arduino Uno
Advantages
In addition to the limitations associated with the ATmega328P, distinct advantages accompany the utilization of such a chip. These advantages often overshadow the microcontroller's limitations, particularly in straightforward projects, especially for those new to microcontroller applications.
Affordability: The ATmega328P chip is cost-effective and readily available, making it a preferred choice for budget-friendly do-it-yourself projects. The Arduino Uno, featuring this chip, stands out as an economic development board.
Ease of Use: Designed with user-friendliness in mind, the ATmega328P is user-friendly compared to other microcontroller chips, rendering it ideal for beginners initiating their DIY projects.
Stand-Alone Capability: The ATmega328P chip can operate independently or with a microcontroller board like the Arduino Uno.
Disadvantages
Like any microcontroller chip, the ATmega328P has its set of limitations that should be considered before embarking on a project involving it. These limitations extend to Arduino boards employing these chips.
Low SRAM Budget
The ATmega328P chip offers 2kB of SRAM, which is generally sufficient for most projects. However, for those dealing with multiple libraries and extensive code containing numerous variables, there is a risk of depleting SRAM, leading to program failure.
Arduino programmers wield significant control over memory management, leveraging C++. By storing text, images, and other pre-made assets in flash memory, additional memory can be freed up for running programs, enhancing the SRAM budget.
Limited Processing Power
The ATmega328P chip features a 20Hz CPU, well-suited for straightforward code execution but lacking the processing power needed for complex applications. Tasks such as speech recognition or deep learning, common in microcontroller applications, could be better for this microcontroller.
Addressing this limitation within the ATmega328P framework is not feasible. If increased processing power is required, exploring alternative microcontroller boards tailored to the specific task becomes necessary, with various options available in the market to meet diverse needs.
ATMEGA328P Replacements & Alternatives
ATMEGA8 can replace ATMEGA328P; ATMEGA328P alternatives include ATMEGA16, ATMEGA32, and ATMEGA8535.
ATMEGA328P Applications
The ATMEGA328P finds extensive applications across various domains:
Integral component in ARDUINO UNO, ARDUINO NANO, and ARDUINO MICRO boards.
Deployment in industrial control systems.
Integration into SMPS and Power Regulation systems.
Execution of digital data processing tasks.
Utilization in analog signal measurement and manipulation.
Inclusion in embedded systems such as coffee machines and vending machines.
Implementation in motor control systems.
Incorporation into display units.
Integration into peripheral interface systems.
ATMEGA328P Package
ATMEGA328P Datasheet
Download ATMEGA328P Datasheet PDF.
Conclusion
This guide is designed to assist you in initiating your journey with the Arduino Uno and its associated ATmega328P microcontroller. Investing time in understanding this hardware before embarking on your upcoming microcontroller project is highly beneficial. It provides valuable insights into potential limitations and challenges that may arise during the course of your work.
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FAQ
- What does the P stand for in ATMEGA328P?
Pico power.
- What is the difference between pic and ATMEGA328P?
The primary distinctions among them encompass: Architecture-wise, the ATMEGA microcontroller adopts the AVR architecture—a RISC architecture innovated by Atmel. In contrast, the PIC microcontroller relies on the PIC architecture, characterized by Harvard architecture and developed by Microchip Technology.
- What is the difference between Arduino and ATmega328P?
The microcontroller steering the operational capabilities of the Arduino Uno development board is the ATmega328P.
- Is ATmega328P analog or digital?
The microcontroller found in the Arduino Uno, namely the Atmel ATmega328P, boasts an analog-to-digital conversion (ADC) module that exhibits proficiency in transforming analog voltage into a numerical representation spanning from 0 to 1023 for 10 bits or 0 to 255 for 8 bits. This module facilitates the option to designate the input source from a pool of six available inputs integrated into the chip.
- How do I install an Arduino ATMEGA328P Bootloader?
The bootloader functions as a .hex file that initiates upon powering up the board, akin to the BIOS on a PC. Its primary tasks include checking if the computer intends to program it and, if so, retrieving the program from the computer and uploading it into the IC's memory. This process ensures that the bootloader remains intact and is not overwritten during the programming phase.
- What are the advantages and disadvantages of ATmega328P microcontroller?
The ATmega328P microcontroller boasts a highly efficient RISC architecture as its primary advantage, ensuring speed and reliability. Its extensive range of peripherals adds to its versatility, making it a favored choice among hobbyists and professionals due to its ease of use and programming.
However, a notable disadvantage of the ATmega328P is its limited memory size, which can pose constraints in specific applications. Additionally, being an 8-bit microcontroller may need to be improved for handling some complex tasks.
In contrast, the ATmega328P stands out for its relatively low power consumption compared to other microcontrollers, rendering it suitable for battery-powered devices. Its cost-effectiveness further enhances its appeal, particularly for projects with budget constraints.
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