atmega328 - What is the purpose of the I/O pin capacitor on the AVR microcontroller? - Arduino Stack Exchange
Read 10 or more switches using only two I/O pins of a microcontroller - EDN
I/O Pins Ports and Circuits of 8051 Microcontroller
Increasing Digital I/O Pins of Arduino uno Using 8255 Peripheral Programmable Interface with Arduino
ESE101: Microcontroller Peripherals, GPIOs, and Blinking Lights: Part 1 — Embedded
ARDUINO What is an Arduino? Features 14 Digital I/O pins 6 Analogue inputs 6 PWM pins USB serial 16MHz Clock speed 32KB Flash memory 2KB SRAM. - ppt download
A guide for microcontroller inputs/outputs: GPIOs « Adafruit Industries – Makers, hackers, artists, designers and engineers!
General Purpose Input/Output (GPIO) Ports in Microcontroller
From SR Latch to Microcontroller I/O Pin Introduction
Controlling IO pin using software | Microcontroller Embedded C
Embedded System | ShareTechnote
Protection on the I/O pins of the microcontroller
protection - Microcontroller - potential damage to IO pin - Electrical Engineering Stack Exchange
io-ports - MIKROE
General Purpose I/O: How To Get More | Hackaday
PIC Microcontrollers Input/Output Ports Tutorial - GPIO Pins - MPLAB XC8
Arduino UNO Rev3 with Long Pins | Arduino Documentation | Arduino Documentation
input output ports 8051 microcontroller | LED blinking example
I/O pins | Arduino for Kids
Read 10 or more switches using only two I/O pins of a microcontroller - EDN
General Purpose Input/Output (GPIO)
GPIO pins of ESP8266 and How to use efficiently -IoTbyHVM
Chapter 6: Parallel I/O ports
