nRESET and QSPI

[ilya]

Hello

Please help me understand how can i connect pin AC13 (P0.18) in dual configuration - QSPI and nRESET.

I would like use a nRF52840 as my main microelectronic. I would like connect external NVR (memory) via QSPI

The nREST pin i will connect to programmer (see below) connector (J-TAG), the question is: how i will connect same pin AC13 - QSPI / CSN and nRESET?

Can you please send to reference design.

[ketiljo]

You can't have anything else on the same pin as the reset line. Select another pin as CSN. You can use any pins for the SPI lines, see the datasheet 

[ilya]

Hi,

but you write in data sheet under "recommended usage" that you suggest AC13 pin be QSPI/CSN, you what that i will ןgnore this comment and use any pins for QSPI?

[ketiljo]

The QSPI pins can be placed anywhere, so just use the pins that is best for you. If you are using reset, make sure no other function is on the same pin.

Note that some pins near the radio shouldn't be used for clock/data signals, see  the pin assignment table, marked as "low frequency I/O only".

[ilya]

Thank you