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TOOL0 needs 1k pull-up #16

@stawiski

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@stawiski

Hi,

First of all, this is a great tool Maksim. Good job 👍

I had some trouble getting it to work, which after some debugging turned out to be hardware issue. I'm using mode 3 (single wire UART).
The TOOL0/P40 signal needs to be pulled-up on the RL78 side - 1kOhm to VDD.
I'd indicate that on the hardware diagram image you included in the repo, so it's clearer.

Cheers

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