What is clock phase and clock polarity

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Joined Jul 12, 2019
Clock signal is a square-wave oscillating digital signal. We can define a clock signal as a particular type of signal that oscillates between a high and a low state.
What is clock phase and clock polarity ? What is difference between clock phase and clock polarity?


Joined Feb 24, 2006
N.B. For a single, stand-alone, clock signal the terms only have a well defined meaning within the context of the SPI (Serial Peripheral Interface) specification. It has to do with when data is valid and which edge of the clock is to be used in performing bus operations. Outside of that specification the terms have no particular meaning.