UART 1MB baud rate and low frequency I/O

[PioterPac]

Hello,

In the documentation on Infocenter for nRF52840 it is recommended to use P1.01 and P1.02 as low-frequency GPIO, while on nRF52840 DK those PINs are used for UART.
Now I am confused whether those PINs could be used for UART communication with 1MB baud rate. Is 1MB UART baud rate high or low frequency from your recommendation perspective 

[Karl Ylvisaker]

Hi,

What do you mean, when you say that the pins on the nRF52840 DK is used for UART? Which application/example are you referring to?
All the GPIO pins are configurable on the nRF52840, meaning that UART is not bound to be on those pins if it is interfering with the radio.

Low frequency is < 10 kHz, so 1 Mbps baud rate is not recommended on low-frequency recommended pins. That is to say, it is not recommended, but you can do it. If you are going to use low-frequency recommended pins for high-frequency signals, you should make sure that the radio is not being used simultaneously, as the high-frequency signals will interfere with the radio pins.

Best regards,
Karl