At what voltage is a digital pin HIGH?

[holmes4]

From the datasheet Section 28.2, for an UNO running at 5V a digital input will read high at a voltage of just 0.6V. Is this correct?.

Mark

[Coding Badly]

VCC = 2.4V - 5.5V

2. "Min." means the lowest value where the pin is guaranteed to be read as high

Is this correct?

Given the conditions, that's my interpretation.

[retrolefty]

From the datasheet Section 28.2, for an UNO running at 5V a digital input will read high at a voltage of just 0.6V. Is this correct?.

Mark

No, the spec is saying that the minimum input pin voltage needed to be detected as a HIGH is .6 X Vcc (60% of the actual Vcc voltage being used). So for a 5 volt arduino board the minimum input pin voltage guaranteed to be detected as a HIGH is +3.0 vdc.
For a 3.3vdc powered board the value would be 1.98vdc.
Lefty

Ah, TC beat me to it.  

[holmes4]

@retro and TC

now that makes a lot more sense!

Mark

[Coding Badly]

Yikes!  Sorry about that.

[retrolefty]

Yikes!  Sorry about that.

Well at least you cast your answer as an interpretation, not a fact.   

Lefty