What is the difference between mode 0 and mode 3 of Cypress SPI bus operations?
Cypress SPI Flash supports SPI bus operation Mode 0 and 3. The primary difference between Mode 0 and Mode 3 concerns the normal state of the CLK signal when the SPI bus master is in standby and data is not being transferred to the Serial Flash. For Mode 0, the CLK signal is normally low on the falling and rising edges of CS#. For Mode 3, the CLK signal is normally high on the falling and rising edges of CS#.