What are CPOL and CPHA, and how do they affect data sampling and shifting in SPI?

Question $18$Answer

a$.$

Control the speed and direction of data transfer.

b$.$

Determine the number of slaves on the bus.

c$.$

CPOL $($Clock Polarity$)$: Sets the idle state of the clock signal $(0$

d$.$

high$).$

e$.$

low, $1$

f$.$

CPHA $($Clock Phase$)$: Determines whether data is sampled on the rising or falling edge of the clock.