General Purpose Input Output - Brief Introduction

This presents the brief introduction about the General Purpose Input Output. Also it describes about the functional operating diagram and it briefs about the respective functional registers.

1. GPIO General Purpose Input Output

2. GPIO ? Generic Pin of an Microprocessor / Microcontroller Can be configured as either input or output Can be enabled / disabled its operation Operating Levels HIGH LOW Output pins are writable and also can be readable Input pins are readable, writing over input pin Pins configured as Input also can operate as interrupt No Predefined operation / purpose

3. Functional Diagram PORT x.n Pin Data Register PORT x.n Pin Status Register Port x Pin n Port x.n Direction

4. Functional Registers GPIO Data Register Data in this register will be driven out to output pin GPIO Direction Register Controls the direction of GPIO either input or output GPIO Pin Status Contains the values of corresponding input GPIO Interrupt Configuration register Low level / High level / Rising edge / Falling edge sensitive GPIO Interrupt Mask register Enable / Disable the interrupt GPIO Interrupt Status Interrupt status indicates whether interrupt occurred or not

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