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What is the difference Between SPI inside of SCI and Independent SPI ?

 I wanted to clarify the difference between using the SCI module’s SPI pins as opposed to using the SPI pins that aren’t within the SCI module. I was wondering if you could explain why one would choose to use either the SPI inside of the SCI module, or use the independent SPI and some design considerations that would be included in making that decision. One more point of confusion for me was why there are pins dedicated to slave selection for SPI communication. To my understanding (which is quite limited), generally with other microcontrollers, you may use a simple GPIO as a slave selection pin, I was wondering if Renesas microcontrollers also had this option or if you have to use the slave selection pins given by the datasheet of the microcontroller.

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