In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

The SX48 has two hardware timers that have a PWM mode; I (and others) have used these for motor control.  Your PWM frequency via SPI is going to be limited to the speed at which you can update the SPI channel.  Better to use an assembly driver to run at the max speed of the device you're talking to.

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