Simple GPIO Functions on Nuvoton N76E003 - LED Blinking and Controlling LED using a Push Button

This project utilizes the Nuvoton N76E003 microcontroller development board to demonstrate fundamental digital input and output (GPIO) operations. At its core, the system divides into an output circuit for driving LEDs and an input circuit for reading user interaction via a tactile push-button switch. For the output function, a GPIO pin on the N76E003 is configured in push-pull or quasi-bidirectional mode to source current through a 100-ohm current-limiting resistor, which protects the LED by safely dropping the excess voltage. By toggling this output pin high and low via software instructions written in the Keil IDE, the microcontroller produces the rhythmic flashing known as LED blinking. For the input function, another GPIO pin is configured to read digital states. A 4.7k resistor is used as a pull-up or pull-down configuration to ensure a stable logic level when the tactile push-button switch is open, preventing floating inputs. When the user presses the button, the circuit completes or alters the voltage state at the input pin, which the microcontroller detects. Through basic conditional logic programmed into the N76E003, the firmware reads this digital input state and updates the output GPIO pin to control an external LED accordingly.