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ATMEGA328P-UP Microcontroller

ATMEGA328P Microcontroller is high performance, low power controller from Microchip. The ATMega328P-UP is 8-bits microcontroller based on AVR RISC architecture. The most popular of all AVR controllers due to the usage in Arduino boards


ATMega328P-UP Pinout Configuration

ATMega328P-UP is a 28 pin chip as shown in pin diagram above. The pins of the chip has additional functions. We will describe functions of each pin in below table.

Pin No. Pin name Description Secondary 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


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
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)



ATMega328P-UP – Simplified Features
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 memory 32Kbytes[10000 write/erase cycles]
CPU Speed 1MIPS for 1MHz
RAM 2Kbytes Internal SRAM
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)


Note: Complete technical details can be found in the ATMega328P-UP Datasheet.

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