And, any idea how to use them? 3 pins is perplexing.
this post was submitted on 13 Mar 2024
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One wire is more for just a few sensors. I think the STmicro stuff has a 1 wire option. At least one of my programmers has a label for it, but with all my hobby stuff, I've never used 1 wire for programming. I have only used it for a temperature sensor as far as I can recall. Everything is either JTAG or UART in my limited experience.
So there's the OneWire protocol that's for sensors, different microcontrollers will implement a programming protocol using a single wire, which is what I meant.
Jtag has a clock signal, but is generally 5 lines.
My point being that looking for similar trace lengths because one is a clock signal isn't sound advice. All the common protocols either don't use a clock signal, or are more than two lines.