What is Pull-up resistor?
A resistor connecting a signal line to the supply so it rests at logic 1 when nothing drives it. It keeps input pins from floating and is used on I2C lines and elsewhere.
Field: Embedded Systems & Firmware
Pull-up resistor in the explanations
An open-drain output either pulls the line to ground or releases it; a pull-up resistor provides the 1.
When several open-drain outputs are connected to one signal…With a pull-up resistor to the supply, the pin reads 1 when the switch is open and 0 when it closes to ground.
A switch alone is connected to a microcontroller input pin,…
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