What is the SPI SCK Clock Output?

Projects Networking, Protocols, and Devices
4

I am using the SC16IS750 which is a SPI to UART converter. The problem is that in Arduino is working, but I need it to work in dsPIC33FJ. I translated the code almost as similar as possible as I can. The problem is that I am receiving values like: ÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ, or ÿÿÿÿÿÿÿÿÿÿ is I change the baudrate, when using dsPIC33FJ but using Arduino it gives me the correct string.

Any idea of why this can be happening?