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What is the output current of a HCS12 microcontroller pin?
The maximum current you should ever source from the pin is 25 ma. Degradation of a 9S12/HCS12 MCU output pin’s low voltage with current. The maximum current you should ever sink with the pin is 25 ma.
What is an MCU pin?
MCU Pin Setup is a visual WYSIWYG tool, which allows you to setup the pin layout and peripherals, get instant feedback of warnings or errors, and check details. It is like converting the documentation to an interactive form.
What is the use of GPIO pin?
A GPIO (general-purpose input/output) port handles both incoming and outgoing digital signals. As an input port, it can be used to communicate to the CPU the ON/OFF signals received from switches, or the digital readings received from sensors.
What is the function of pin?
A pin is a device used for fastening objects or material together, and can have three sorts of body: a shaft of a rigid inflexible material meant to be inserted in a slot, groove, or hole (as with pivots, hinges, and jigs); a shaft connected to a head and ending in a sharp tip meant to pierce one or more pieces of soft …
Why does a MCU pin know what level it is at?
In contrast, an MCU pin configured as an OUTPUT “knows what level it’s at” because it does the driving – a “floating” MCU OUTPUT pin tied to some input of another circuit doesn’t make sense, because the state of the MCU pin can only be high or low… do I have this right?
Can a MCU pin be a GPIO pin?
But most mcu pins are GPIO, and sometimes on startup are defined as inputs instead of outputs. As you said, sometimes you don’t want an IC pin input floating on startup, especially like a reset pin that you would normally drive with your microcontroller’s GPIO.
How are GPIO pins used in microcontrollers?
They are used on inputs to prevent floating lines, rapidly switching between high and low and a middle “undefined” region. Outputs normally do not need them. But most mcu pins are GPIO, and sometimes on startup are defined as inputs instead of outputs.
What happens to the input pin on a microcontroller?
If any of the open-drains are pulling the line to zero, the input will be zero. Since none are ever pushing, you won’t have any digital infighting (which is worse than floating pins).