Skip to main content
Zt Liu
Zt Liu
Senior III
October 12, 2017
Question

GPIO Speed Configuration

  • October 12, 2017
  • 1 reply
  • 533 views
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:

0690X00000608WoQAI.png

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
This topic has been closed for replies.

1 reply

Tesla DeLorean
Tesla DeLorean
Guru
October 12, 2017
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'

Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
Zt Liu
Zt LiuAuthor
Senior III
October 12, 2017
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!

Terms & ConditionsAccessibility statement