ATmega16 Pin Diagram & Description (2024)

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ATmega16 is an 8-bit high performance microcontroller from the Atmel’s Mega AVR family. Atmega16 is a 40 pin microcontroller based on enhanced RISC (Reduced Instruction Set Computing) architecture with 131 powerful instructions. It has a 16 KB programmable flash memory, static RAM of 1 KB and EEPROM of 512 Bytes. The endurance cycle of flash memory and EEPROM is 10,000 and 100,000, respectively. Most of the instructions execute in one machine cycle. Itcan work on a maximum frequency of 16MHz. ATmega16 pin diagram should clarify things a bit.

ATmega16 pin diagram

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ATmega16 Pin description

PIN1	I/O , T0 ( Timer0 External Counter Input) ,XCK : USART External Clock I/O
PIN2	I/O, T1 (Timer1 External Counter Input)
PIN3	I/O, AIN0: Analog Comparator Positive Input , INT2: External Interrupt 2 Input
PIN4	I/O, AIN1: Analog Comparator Negative Input, OC0 : Timer0 Output Compare Match Output
PIN9	Reset Pin, Active Low Reset
PIN10	VCC=+5V
PIN11	GND
PIN12	XTAL2
PIN13	XTAL1
PIN14	(RXD) ,I/O PIN 0,USART Serial Communication Interface
PIN15	(TXD) ,I/O Pin 1,USART Serial Communication Interface
PIN16	(INT0),I/O Pin 2, External Interrupt INT0
PIN17	(INT1),I/O Pin 3, External Interrupt INT1
PIN18	(OC1B),I/O Pin 4, PWM Channel Outputs
PIN19	(OC1A),I/O Pin 5, PWM Channel Outputs
PIN20	(ICP), I/O Pin 6, Timer/Counter1 Input Capture Pin
PIN21	(OC2),I/O Pin 7,Timer/Counter2 Output Compare Match Output
PIN22	(SCL),I/O Pin 0,TWI Interface
PIN23	(SDA),I/O Pin 1,TWI Interface
PIN24-27	JTAG INTERFACE
PIN28 :	(TOSC1),I/O Pin 6,Timer Oscillator Pin 1
PIN29 :	(TOSC2),I/O Pin 7,Timer Oscillator Pin 2
PIN30 :	AVCC (for ADC)
PIN31 :	GND (for ADC)
PIN33 – PIN40	PAx: I/O,ADCx (Where x is 7 – 0)

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Data sheet for the ATmega 16 is available here. If you have one lying around, some sample circuits to work on, are available here.