Proteus ISIS - Logic Contention(s) detected on net SCK

[HectorVerus]

Hello, sorry if this the post is not in the right thread, but I need some help as soon as possible ;-)

I barely use Proteus ISIS and I have poor knowledges on it, but there is an error that I am not able to fix and that's why I need your help.

Below, you can find the screenshot of my error and you can see the layout of the schema



Thanks for responding. :grin:

 

[andre_luis]

Without knowing how the SCK pin address registers are configured in each microcontroller, it is difficult to say anything, but in short, there may be having conflict ( 2 active outputs simultaneously driving ).

 

[HectorVerus]

Thanks, but I still don't know how to fix the problem :/

 

[andre_luis]

Me neither:

Without knowing how the SCK pin address registers are configured in each microcontroller, it is difficult to say anything

 

[HectorVerus]

How can I know that?

 

[andre_luis]

How can I know that?

If you don't have the source code, no way to know that. You could turn around by inserting a series resistor between both SCK pins, just try.

 

[HectorVerus]

Adding resistors between both SCK pins worked. Thanks for helping. ;-)

 

[spudboy488]

It is just a warning and can be ignored since you know that the slave, when configured, will change the SCK pin to an input to be driven by master. It is just a simulation and Proteus may not take that into account.