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• Unused digital I/Os can be left unconnected and floating although it is not wise to do so.
• The same applies for oscillator pins. By default, GRACE treats them as oscillator pins.
• I/Os are not 5V tolerant. Some sort of mechanism must be applied when using 5V devices.
• Most I/Os have more than one function and so be aware of conflicts.
• When driving large loads with I/O, use external components like BJTs, FETs, drivers, etc.
• When using GRACE, be sure of the IC package you are using.
• When external pull resistor is present, do not use the internal ones and vice versa.
• Explore your device’s datasheet for I/O features and limits although most are common.
Demo
Demo video: https://www.youtube.com/watch?v=fWlNiEZk4iM.
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