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What does GPIO pull-up mean?
When you pressed the button, the GPIO will be 0 . While not pressed, we have the GPIO connected to positive ( VCC ). So, any current that is there will be pulled-up so that the GPIO registers a logical 1 . So, when we press the button, the current that’s flowing will flow to Ground.
How does a GPIO work?
A GPIO is a signal pin on an integrated circuit or board that can be used to perform digital input or output functions. GPIO may be implemented by dedicated integrated circuits, or more often are directly supported by system on a chip (SoC) or system on a module (SoM) devices.
What does a pull up resistor do on a GPIO?
To limit the high current from the supply, a pull-up resistor, pulls up the impedance and limits the current supplying the LED from the power supply (+5 V). Hence the LED is protected form high currents. Based on the circuit, a pull-up function varies and form protection to wired AND logic to an I²C bus.
What’s the difference between Pull Up and pull down resistors?
As pull up resistors, Pull-down resistors also works in the same way. But, they pull the pin to a low value. Pull-down resistors are connected between a particular pin on a microcontroller and the ground terminal.
What is the purpose of using a pull up resistor in an 8051?
To ensure the values of an I/P is always in a known state, pull up and pull-down resistors are used.The main function of pull-up and pull-down resistors is that the pull up resistor pulls the signal to high state unless it is driven low; and, a pull-down resistor pulls the signal to low state unless it is driven high.
What does push pull mean in a microcontroller?
push-pull – a transistor connects to high, and a transistor connects to low (only one is operated at a time) Input pins can be a gate input with a: pull-up – a resistor connected to high pull-down – a resistor connected to low