Electronic – Is SPI clock always active

spi

sorry it could be a basic question but still, I didn't find the answer on the web

is the SPI clock always active or active only when CS is low (during data exchange)?

Best Answer

The SPI clock is only active while the chip select is low, yes.

As correctly stated in the comment, if there's no transmission active, the clock will stay idle even if the chip select is low.

The idle state of the clock (high or low) depends on the chosen SPI mode

https://www.analog.com/media/en/analog-dialogue/volume-52/number-3/introduction-to-spi-interface.pdf