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Is it allowed to keep the input receiver buffer enabled all the time?

Question asked by Peter Lischer on Nov 18, 2014
Latest reply on Nov 20, 2014 by Naoum Gitnik

In order to use a pad as an input, the input receiver buffer needs to be enabled with the input buffer enable field (IBE). This is clear so far. My question is whether it is allowed to keep this input buffer enabled all the time, even if a pin is used as an output. Is there any drawback when leaving the buffer enabled? Could there be any conflict with interfaces when leaving the buffer enabled?

 

Here an example:

The Ball PTD0 is configured and used as SCI2_TX output (UART TX). Is it possible to leave the input buffer enabled in order to be able to read back the actual pin level? This could be helpful to detect whether the SCI2_TX output is shorted externally.

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