Using one DC motor driver for multiple motors that aren't going to be used simultaneously
Encode your control dateset in 8 bit BCD and output it in parallel to be in decoded decimal bit format or encode it in serial and demux the data with the appropriate shift register/demux method.
I really don't know your application, but in other applications where many motors are run simultaneously: professional stage intelligent lighting, each fixture has its own microprocessor control for its internal stepper motors, and rs485 running a serial protocol framed in BCD addressing.