TDO interfere with PIO0_8 even if JTAG is not used

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TDO interfere with PIO0_8 even if JTAG is not used

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brunog
Contributor I

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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FelipeGarcia
NXP Employee
NXP Employee

Hi Bruno,

 

Thank you for your input and work-around.

 

Have a great day,

Felipe

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