As https://community.cypress.com/docs/DOC-15108 description, how much clock rate I can configuration, and What effect will it have?
The clock speed is equal to baud rate that you desire for CXPI data.
For example, for 20 Kbps baud rate, set the clock speed to 20 KHz.
The Tx data is transmitted by varying the clock's pulse width.
This is as per CXPI specification.
Please feel free to update for any clarification.
Thanks and Regards