Teensy 4.1 Minimum Hardware SPI Speed?

[Doodads]

I'm debugging a SPI communication error between my Teensy 4.1 and an SPI stepper driver (TMC2130), and I'm having trouble dropping the SPI speed to my target 120kHz. I'm using spi_speed
= 120000 with the below:

SPI.beginTransaction(SPISettings(spi_speed, MSBFIRST, SPI_MODE3));

I found https://www.pjrc.com/teensy/td_libs_SPI.html which states "The SPI protocol allows for a range of transmission speeds ranging from 1Mhz to 100MHz." Is it impossible to drop the SPI speed lower than 1Mhz?

 

[mewyc]

Linking a Teensy 4.1 hardware solution here for future reference:
https://forum.pjrc.com/threads/73363-Achieving-slow-(10-kHz)-SPI-clock-on-Teensy-4-1-using-LPSPI-TCR-PRESCALE?p=330353&viewfull=1#post330353