RE: The max UART speed

Håkon Alseth — Wed, 04 Sep 2024 11:47:09 GMT

Hi Viet,

Always happy to help out. Hope you have a wonderful day!

Kind regards,

Håkon

Viet.N — Wed, 04 Sep 2024 10:18:13 GMT

Thank you for your answer!

Viet

Håkon Alseth — Wed, 04 Sep 2024 10:10:21 GMT

Hi,

[quote user=""]

As mentioned in the datasheet, UARTE can operate up to 1Mhz. Is there any special condition/factor to achieve this?

[/quote]

That is correct, as also stated in the PS:

The nRF5340 UARTE can operate up to 1 MBaud. Note that in order to achieve wanted tolerance, you should start the external HFCLK.

If not, it will be sourced from internal HFRC, which is quite inaccurate.

[quote user=""]

and how fast can a regular GPIO operate?

[/quote]

GPIOs are sourced from the PCLK16M (actual switching freq. will be lower) unless otherwise stated.

As an example, dedicated QSPI or high-speed SPI pins can be sourced from a higher frequency.

Kind regards,

Håkon