Serial Peripheral Interface (SPI) question

[jcf]

For Serial Peripheral Interface (SPI), there are four combinations of SCK phase and polarity with respect to serial data, which determine four SPI data modes (0..3).
Why is it necessary to have these four modes, or when it is better to use one or another?

Thanks in advance.
jcf

 

[C-Man]

The SPI mode depends on the type of the peripheral that you connect to the SPI bus.

Most peripherals I have worked with operate either in mode1 or in mode3 but you have to consult the datasheet of the peripheral that you want to connect.

best regards

 

[tlp71@hotmail.com]

you can also connect various devices whit different mode, you need only to use a chip select for ever device.
Bye.
G.