SPI Data lengths greater than 16 bits

The SPI interface handles data frame sizes from 1 to 16 bits directly. Larger sizes can be handled by splitting data up into groups of 16 bits or less. For example, 24 bits can be supported as 2 groups of 16 bits and 8 bits or 2 groups of 12 bits, among others. Frames of any size, including greater than 32 bits, can supported in the same way.

Details of how to handle larger data widths depend somewhat on other SPI configuration options. For instance, if it is intended for Slave Selects to be deasserted between frames, then this must be suppressed when a larger frame is split into more than one part. Sending 2 groups of 12 bits with SSEL deasserted between 24-bit increments, for instance, would require changing the value of the EOF bit on alternate 12-bit frames.


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