arduino raspberry-pi spi raspberry-pi-pico arduino-nano

What is the maximum data transfer speed using SPI interface on Arduino?

I have an Arduino Nano and I want to transfer data between it and a Raspberry Pico. I use SPI interface, and I want to know, what is the data speed limit (in bit per second).

Solution

If you take a look into the Atmega328p datasheet, then there is:

F_OSC/2 in Master mode (with double speed SPI bit set), otherwise F_OSC/4
As a slave at best F_OSC/4

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