Usage
GPIOs are used in:
- chips with pin scarcity: IC, SoC, embedded and custom hardware, programmable logic devices (e.g., FPGAs)
- multifunction chips: power managers, audio codecs, video cards
- embedded applications (e.g., Arduino) make heavy use of GPIO for reading from various environmental sensors (IR, video, temperature, 3-axis orientation, acceleration), and for writing output to dc motors (via PWM), audio, LCD displays, or LEDs for status.
Read more about this topic: General Purpose Input/Output
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