Microcontroller: 1-wire Interface, SPI Interface - IIIT

SPI: Modes of Operation
Clock phase one (CPHA = 1): MOSI and MISO are valid on
falling/rising edge of SCK for low/high clock polarity respectively
Clock phase one and low clock polarity
SPI Mode 0: CPOL = 0, CPHA = 0; SPI Mode 1: CPOL = 0, CPHA = 1;
SPI Mode 2: CPOL = 1, CPHA = 0; SPI Mode 3: CPOL = 1, CPHA = 1
Most common modes: SPI Mode 0 and 3 (data sampled on positive
clock edge)
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