GPIO Speed Configuration

[Zt Liu]

Posted on October 12, 2017 at 04:02

Dear all,

When we set OSPEED bits in the GPIO registers, we can configure the IO speed, 

with spec like this:

I am just curios...(and sorry for I've got no EE diploma)

When we modify these bits by software, what's the corresponding hardware configurations??!!

(I cannot found this information from Ref Man and Datasheet)

Thanks for reading this post!

#gpio-speed #gpio

[Tesla DeLorean]

Posted on October 12, 2017 at 04:45

The 'speed' really relates to how aggressively the the state of the line is changed, sharpness of the rising/falling edge. You'd expect this to come from using more or large transistors so that more current can be applied to the external capacitive load, which is effectively resisting the change in state.

See also 'Slew Rate'

[Zt Liu]

Posted on October 12, 2017 at 04:57

You'd expect this to come from using more or large transistors

This is exactly what I need to know!!

Thanks!