3 ms·

I work with Cortex-M since they launched and I've never seen on heard about this problem. Of course, I don't know the kind of environment your devices work, but

by scoutt 7y ago

I work with Cortex-M since they launched and I've never seen on heard about this problem. Of course, I don't know the kind of environment your devices work, but many of my projects run in automotive. TCK has usually a pull-up/termination (but I've also seen pull-downs with/without caps). You see this issue even with the pull-up/down?

retSava 7y ago
This was primarily in a lighting solution, and it wasn't the only problem with that early hw. We noticed lights not coming back online after a firmware update without a power cycle. Since it was very early hw, IIRC it didn't have any shielding, and also IIRC no pull on TCK. We now see this primarily on 1st/early iteration hw and on prototypes, but checking this proactively have saved us from a lot of headaches of the type "why doesn't it come back online - hw, or something in the update, or what...".