Datasheet
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SERIAL DIGITAL INTERFACE
When CPHA equals zero, there is a potential problem that can be avoided by proper
software but is sometimes overlooked. The SPIF flag is set at the end of a transfer,
but the slave is not permitted to write new data to the SPDR while the /SS line is still
low. If the master device is busy, the /SS line to the slave can remain low longer than
the slave expects.