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TDO interfere with PIO0_8 even if JTAG is not used

Question asked by Bruno Galli on Sep 24, 2019
Latest reply on Sep 24, 2019 by Felipe García

Did anyone experience the following behaviour?

 

TDO seems to interfere with PIO0_8 even if JTAG is not configured.

In certain conditions TDO take control of PIO0_8.

The conditions are not yet clear but probably tied to one particulat input pin at reset.
Verified in two out of three projects. PIO0_8 always holds to zero and cannot be changed to input or driven to one.

All the projects use LPC1519JBD100.

 

Work-around:

SWO (SWD trace output) should always be assigned in order to free PIO0_8.

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