The SPI Client interface supports four standard modes as determined by the Clock Polarity (CPOL) and Clock Phase (CPHA) settings. These modes are illustrated in the following table and figure.
| Mode | CPOL | CPHA |
|---|---|---|
| 0 | 0 |
0 |
| 1 | 0 |
1 |
| 2 | 1 |
0 |
| 3 | 1 |
1 |
Note: The ATWINC15x0 firmware uses
SPI MODE 0to communicate with the host.
The red lines in the following figure correspond to Clock Phase = 0 and
the blue lines correspond to Clock Phase = 1.
Figure 1. SPI Client Clock Polarity and Clock Phase Timing
