JTAG/SWI pull-up pull-down resistor
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‎2019-01-25 12:59 AM
good morning, I wanted to ask a simple question.
I'm drawing the schematic of a small board based on the NUCLEO-F401RE.
I have a doubt about the JTAG/SWI connector, practically on various schemes I have seen that there are pullup/pulldown resistor (see attached) but on the NUCLEO scheme it seems to me that there are not. So the question is: do I need pull-up/pull-down on the JTAG/SWI interface?
Thanks in advance
FM
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STM32F4 Series
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‎2019-01-25 1:20 AM
I general you don't need Jtag Pull Up/Down. The STM32 Jtag interface has internal pulls.
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‎2019-01-28 12:07 AM
the SWD interface also have internal pull-up/down ?
in all cases do you advise me to provide pull-ups on the pcb and not to mount the resistances or is it totally useless and I do not even plan them?
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