ATMEGA2561-16AU Detailed explanation of pin function specifications and circuit principle instructions

The ATMEGA2561-16AU is a microcontroller from Atmel (now part of Microchip Technology). It belongs to the ATmega series, a family of 8-bit microcontrollers based on the AVR architecture.

Package Type:

The ATMEGA2561-16AU is available in a QFP (Quad Flat Package), specifically the 100-pin QFP package.

Detailed Pin Function Specifications:

The ATMEGA2561-16AU has 100 pins, and the function of each pin is described below in a table format. Here is a list of pin functions and their detailed explanations:

Pin Number Pin Name Function Description 1 VCC Power supply pin (typically 5V or 3.3V depending on the application). 2 GND Ground pin. Connects to system ground. 3 PORTA0 (PA0) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC0). 4 PORTA1 (PA1) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC1). 5 PORTA2 (PA2) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC2). 6 PORTA3 (PA3) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC3). 7 PORTA4 (PA4) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC4). 8 PORTA5 (PA5) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC5). 9 PORTA6 (PA6) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC6). 10 PORTA7 (PA7) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC7). 11 PORTB0 (PB0) Digital I/O pin. Can be configured as input or output. 12 PORTB1 (PB1) Digital I/O pin. Can be configured as input or output. 13 PORTB2 (PB2) Digital I/O pin. Can be configured as input or output. 14 PORTB3 (PB3) Digital I/O pin. Can be configured as input or output. 15 PORTB4 (PB4) Digital I/O pin. Can be configured as input or output. 16 PORTB5 (PB5) Digital I/O pin. Can be configured as input or output. 17 PORTB6 (PB6) Digital I/O pin. Can be configured as input or output. 18 PORTB7 (PB7) Digital I/O pin. Can be configured as input or output. 19 PORTC0 (PC0) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC8). 20 PORTC1 (PC1) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC9). 21 PORTC2 (PC2) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC10). 22 PORTC3 (PC3) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC11). 23 PORTC4 (PC4) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC12). 24 PORTC5 (PC5) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC13). 25 PORTC6 (PC6) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC14). 26 PORTC7 (PC7) Digital I/O pin. Can be configured as input or output. Analog function for ADC input (ADC15). 27 PORTD0 (PD0) Digital I/O pin. Can be configured as input or output. 28 PORTD1 (PD1) Digital I/O pin. Can be configured as input or output. 29 PORTD2 (PD2) Digital I/O pin. Can be configured as input or output. 30 PORTD3 (PD3) Digital I/O pin. Can be configured as input or output. 31 PORTD4 (PD4) Digital I/O pin. Can be configured as input or output. 32 PORTD5 (PD5) Digital I/O pin. Can be configured as input or output. 33 PORTD6 (PD6) Digital I/O pin. Can be configured as input or output. 34 PORTD7 (PD7) Digital I/O pin. Can be configured as input or output. 35 T0 Timer/Counter 0 output. 36 T1 Timer/Counter 1 output. 37 T2 Timer/Counter 2 output. 38 VREF Voltage Reference input pin. Can be used to reference ADC conversion. 39 AVCC Analog VCC input. Should be connected to a clean power supply, typically 5V. 40 AREF Analog Reference pin. Used to set the voltage reference for the ADC. 41 RESET Active low reset pin. When low, the microcontroller resets. 42 SCK SPI Clock pin. 43 MISO SPI Master In Slave Out pin. 44 MOSI SPI Master Out Slave In pin. 45 SS SPI Slave Select pin. 46 RXD USART Receive pin. 47 TXD USART Transmit pin. 48 SDA I2C Data pin. 49 SCL I2C Clock pin. 50 ICP1 Input Capture Pin for Timer/Counter 1. 51 OC1A Output Compare A pin for Timer/Counter 1. 52 OC1B Output Compare B pin for Timer/Counter 1. 53 INT0 External Interrupt 0 pin. 54 INT1 External Interrupt 1 pin. 55 INT2 External Interrupt 2 pin. 56 INT3 External Interrupt 3 pin. 57 TWI Two-Wire Interface. 58 JTAG JTAG Interface pin. 59 TDI Test Data In for JTAG. 60 TDO Test Data Out for JTAG. 61 TMS Test Mode Select for JTAG. 62 TCK Test Clock for JTAG. 63 GND Ground pin (again).

This pinout covers many functions like digital I/O, analog input, USART, SPI, I2C, and timers. The ATMEGA2561-16AU has a wide range of functionalities, including ADC channels, UART communication, and support for multiple peripherals.

FAQ (Frequently Asked Questions):

What is the operating voltage of the ATMEGA2561-16AU? The operating voltage is typically 5V or 3.3V, depending on the application. How many pins does the ATMEGA2561-16AU have? It has 100 pins. What is the maximum clock frequency of the ATMEGA2561-16AU? The maximum clock frequency is 16 MHz. How do I configure the pins for analog input on the ATMEGA2561-16AU? You can configure pins like PA0 to PA7, PC0 to PC7 as analog input by selecting them in the ADC setup. What is the maximum current for the I/O pins on the ATMEGA2561-16AU? The maximum current for each I/O pin is 20 mA. Does the ATMEGA2561-16AU support SPI communication? Yes, it supports SPI communication through pins like SCK, MISO, MOSI, and SS. Can the ATMEGA2561-16AU be used for PWM output? Yes, it supports PWM output on several pins such as OC1A and OC1B. What is the function of the RESET pin? The RESET pin is used to reset the microcontroller when it is driven low. What is the purpose of the AREF pin? The AREF pin is used to provide a reference voltage for the ADC. How many ADC channels does the ATMEGA2561-16AU support? The ATMEGA2561-16AU supports 16 ADC channels (ADC0 to ADC15). Can the ATMEGA2561-16AU communicate via USART? Yes, it supports USART communication through RXD and TXD pins. What is the I2C functionality on the ATMEGA2561-16AU? The ATMEGA2561-16AU supports I2C communication through the SDA and SCL pins. What is the purpose of the TDI, TDO, TCK, and TMS pins? These are the pins used for JTAG debugging and testing. What is the voltage reference input (VREF) used for? It provides the reference voltage for the ADC to ensure accurate analog-to-digital conversion. How can I use external interrupts on the ATMEGA2561-16AU? External interrupts are available on pins INT0, INT1, INT2, and INT3. Can the ATMEGA2561-16AU be used for low-power applications? Yes, the microcontroller supports low-power modes for energy-efficient applications. What is the clock source for the ATMEGA2561-16AU? It can use an external crystal oscillator or an internal clock source. Does the ATMEGA2561-16AU have a watchdog timer? Yes, it includes a watchdog timer for system reliability. What is the function of the OC1A and OC1B pins? These pins are used for Output Compare on Timer/Counter 1, enabling PWM and other time-based functions. How do I reset the ATMEGA2561-16AU? You can reset the microcontroller by driving the RESET pin low.

This detailed guide includes all pin functions and answers to common questions. It provides complete documentation for working with the ATMEGA2561-16AU.