Why is SPI clock baud rate limited to 18Mbit/s?

[JAlle.2]

I'm using the STM32F072RB MCU and I am trying to increase the SPI baud rate. The HSI48 Clock is 48MHz and the minimum SPI clock prescaler is 2 which comes out to be 24Mbit/s. However, it gives me an error stating that the baud rate is more than 18MBit/s. Why is this and is there anyway to change it?

[waclawek.jan · Accepted solution]

This is the limit given in DS, see SPI/I2S characteristics chapter.

So no, you can't change it, learn to live with it.

JW

[TDK]

Or replace the chip with one that can do 24 MHz. Plenty of them out there.