The signal PD3 which is outside the parentheses is the default function of the pin. ![]() For example: Pin-5 is associated with four signals, and these are: PCINT19, OC2B, INT1, and PD3. An IO (input and output) line is used to connect input device like switch and output device like LED.Ī pin is associated with one or more signals. (4) Delivers the result to the user via 7-segment/LCD display device.ġ.4 Pin Diagram and Pin Signals of ATmega328P MCUĪTmega328P MCU has 28 pins (Fig-1.1) of which 20 are IO line (also known as port-line or port-pin). (3) Modifies data in a way the user wants, and (2) Takes data from the user via keyboard, (1) Takes command (+, _, *, and /) from the user via keyboard, (2) Prepaid Electrical Energy Meter (PEM), ,andįigure-1.2: Microcontroller based measuring instruments ![]() We can use a MCU to build the following instruments: The MCU can process only 8-bit data at a time.įigure-1.1: Pictorial view, pin diagram, and pin signals of ATmega328P microcontroller The full name is “Micro Controlling Unit”, the short name is “Microcontroller”, and the abbreviated name is “MCU”. ![]() It is this 28-pin semiconductor chip of Fig-1.1. 1.1 What is an ATmega328P Microcontroller?
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