ATmega328P is a microcontroller chip from the AVR family of microcontrollers, developed by Microchip Technology (previously Atmel Corporation). It is widely used in embedded systems for a variety of applications due to its versatility, ease of use, and availability of resources.
ATmega328P is a 8-bit microcontroller with 32KB of Flash memory, 2KB of SRAM, and 1KB of EEPROM. It operates at a maximum clock speed of 16MHz and is based on the RISC (Reduced Instruction Set Computing) architecture. It features 23 General Purpose I/O (GPIO) pins, multiple communication interfaces (UART, I2C, SPI), a 10-bit ADC, timers and counters(ATmega328 Timer0, Atmega328p Timer1 and ATmega328p Timer 2), ATMega328 Pin Change Interrupt, and power-saving modes.
ATmega328P is commonly used in various applications such as home automation, robotics, IoT (Internet of Things) devices, wearable electronics, sensor networks, and many other embedded systems projects. It is widely supported by the Arduino development platform, which makes it popular among DIY electronics enthusiasts and hobbyists due to its ease of use and abundant resources available in the form of libraries, tutorials, and examples.
The ATmega328 is an 8-bit microcontroller chip that is part of the AVR
family of microcontrollers developed by Microchip Technology (previously
Atmel). It is widely used in various embedded systems and DIY
electronics projects due to its versatility, ease of use, and
affordability. The ATmega328 comes in different package types, such as
DIP (Dual Inline Package), QFP (Quad Flat Package), and MLF (Micro Lead
Frame), with varying pin counts. However, the most commonly used version
is the ATmega328P, which has 28 pins in a DIP package.
The pins of ATmega328P are labeled with a combination of letters and numbers, such as PB0, PC1, PD2, etc. These pins are used for various purposes, such as digital input/output (GPIO), analog input, ATmega328p USART, SPI, I2C communication interfaces, ATmega328p Timer and counters, Atmega328P external interrupt and pin change interrupts, and other functions. The pinout diagram of ATmega328P can be found in its datasheet, which provides detailed information on the functionality of each pin.
Shown below is ATmega328P IC(Integrated Chip).
Here is a brief overview of the pinout of the ATmega328P in a DIP package:
- PD0 / RXD: Serial receive (UART) pin. Can be used for communication with other devices using UART protocol.
- PD1 / TXD: Serial transmit (UART) pin. Can be used for communication with other devices using UART protocol.
- PD2 / INT0: External interrupt 0 pin. Can be used to trigger an interrupt when an external event occurs.
- PD3 / INT1: External interrupt 1 pin. Can be used to trigger an interrupt when an external event occurs.
- PD4 / XCK/T0: Crystal oscillator (clock) input or Timer 0 clock input.
- PD5 / T1: Timer 1 clock input or PWM output.
- PD6 / AIN0: Analog input 0 (ADC0) pin. Can be used to read analog signals from sensors or other devices.
- PD7 / AIN1: Analog input 1 (ADC1) pin. Can be used to read analog signals from sensors or other devices.
- VCC: Supply voltage (typically 5V).
- GND: Ground (0V).
- PB0 / SCL / PCINT0: I2C serial clock (SCL) pin or Pin Change Interrupt 0 pin.
- PB1 / SDA / PCINT1: I2C serial data (SDA) pin or Pin Change Interrupt 1 pin.
- PB2 / AREF / PCINT2: Analog reference voltage (AREF) pin or Pin Change Interrupt 2 pin.
- PB3 / PWM / PCINT3: PWM output or Pin Change Interrupt 3 pin.
- PB4 / OC2A / PCINT4: Output Compare 2A (PWM) or Pin Change Interrupt 4 pin.
- PB5 / OC1A / PCINT5: Output Compare 1A (PWM) or Pin Change Interrupt 5 pin.
- PB6 / OC1B / PCINT6: Output Compare 1B (PWM) or Pin Change Interrupt 6 pin.
- PB7 / CLKO / PCINT7: System clock output (CLKO) or Pin Change Interrupt 7 pin.
- AVCC: Analog supply voltage reference for ADC (typically connected to VCC).
- AREF: Analog reference voltage (used to set the reference voltage for ADC).
- GND: Ground (0V).
- PC6 / RESET: Reset pin. Can be used to reset the microcontroller.
- PC5 / SCL / ADC5: I2C serial clock (SCL) pin or Analog input 5 (ADC5) pin.
- PC4 / SDA / ADC4: I2C serial data (SDA) pin or Analog input 4 (ADC4) pin.
- PC3 / ADC3: Analog input 3 (ADC3) pin.
- PC2 / ADC2: Analog input 2 (ADC2) pin.
See next What is ATmega328 used for? ATmega328 Applications.
