Is "asserted" low or high logic level in case of UART?

[Jarmo]

This should have been a very simple question. I don't want to use CTS/RTS flow control signals with my UART-USB-converter ("FTDI chip"). For that case, the document says "the CTS signal on the other device (the FTDI chip) can be tied to the asserted logic level". However, I am not sure whether the UART uses inverted logic, in which case asserted would be low (zero volts), or vice-versa, when it would be high (the power supply voltage). I haven't found a clear answer yet, maybe somebody could clarify the thing here?

[Jørgen Holmefjord]

Hi,

The UART module is described in the nRF52832 Product Specification.

Best regards,

Jørgen

[Jarmo]

I know there's a lot of documentation. A quick look showed the wording is "activated" and "deactivated" there, and yet it stays unclear which one is "high" and which one "low"? A picure behind your link gives some hint, though, but I would like to see a clear answer for a clear question...

[Jørgen Holmefjord]

Both CTS and RTS signals are active low.

[Jarmo]

Thanks for that!